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M14_Part1_Tier1.ppt

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M14_Part1_Tier1.ppt

  1. 1. Program for North American Mobility in Higher Education Created by: École Polytechnique de Montréal, Instituto Mexicano del Petroleo & Universidad Autonoma de San Luis Potosi. Module 14.“Life Cycle Assessment (LCA)” : 4 steps of LCA, approaches, software, databases, subjectivity, sensitivity analysis, application to a classic example.
  2. 2. <ul><li>Module 14 is divided into 3 “tiers”, each with a specific goal: </li></ul><ul><ul><li>Tier 1 : Basic Concepts. </li></ul></ul><ul><ul><li>Tier 2 : How to use computer tools. </li></ul></ul><ul><ul><li>Tier 3 : How to Apply the Tool in a real world context. </li></ul></ul>S T R U C T U R E O F M O D U L E This module is intended to convey the basic aspects of Life Cycle Assessment (LCA) methods and tools, using a case study approach.
  3. 3. <ul><li>Background Information . To provide a general overview of life cycle assessment (LCA) and its potential applications. </li></ul>Tier I : Purpose
  4. 4. B A S I C C O N C E P T S T i e r I
  5. 5. REFERENCES <ul><li>Gaudreault, C., Samson, R., Stuart, P. (2004). “ Survey of LCA Applications and Methodologies in the Pulp and Paper Industry” . Paper submitted to TAPPI Journal. </li></ul><ul><li>Goedkoop and Oele. 2002. ”User Manual Introduction into LLCA methodology and practice with SimaPro 5.1“. </li></ul><ul><li>International Organization for Standardization.2000.“Environmental Management – Life Cycle Assessment – Principles and Framework”. Geneva, Switzerland. Notes: ISO 14040 </li></ul><ul><li>International Organization for Standardization.2000 “Environmental Management – Life Cycle Assessment – Goal and Scope Definition and Inventory Analysis”. Geneva, Switzerland. Notes: ISO 14041 </li></ul><ul><li>International Organization for Standardization.2000.“Environmental Management – Life Cycle Assessment – Life Cycle Impact Assessment”. Geneva, Switzerland. Notes: ISO 14042 </li></ul><ul><li>International Organization for Standardization.2000.“Environmental Management – Life Cycle Assessment – Life Cycle Interpretation”. Geneva, Switzerland. Notes: ISO 14043 </li></ul><ul><li>Lopes, Dias, Arroja, Capela and Pereira, 2003 “Application of life cycle assessment to the Portuguese pulp and paper industry”. Journal of Cleaner Production. </li></ul><ul><li>Pollution Prevention – A Federal Strategy for Action, 1995 </li></ul><ul><li>Svoboda S. (1995). “ Note of Life Cycle Analysis ”. National Pollution Prevention Center for Higher Education. </li></ul><ul><li>Society of Environmental Toxicology and Chemistry (SETAC), www.setac.org </li></ul><ul><li>United Nations Environment Programme (UNEP), www.unep.org </li></ul>
  6. 6. Tier I : Contents <ul><li>Introduction and definition of the Life Cycle Assessment (LCA). • ISO 14040 guidelines. </li></ul><ul><li>Overview of 4 stages of life cycle methodology. </li></ul><ul><li>Survey of life cycle applications in the pulp and paper industry. • Types of applications. • Analysis of methodologies that have been employed, and identification of deficiencies in methodology. </li></ul><ul><li>Proposal of “life cycle thinking” concept: using LCA as a tool for practical applications in the operation of a facility. </li></ul><ul><li>Multiple choice questions </li></ul>
  7. 7. Tier I : Contents <ul><li>Introduction and definition of the Life Cycle Assessment (LCA). • ISO 14040 guidelines. </li></ul><ul><li>Overview of 4 stages of life cycle methodology. </li></ul><ul><li>Survey of life cycle applications in the pulp and paper industry. </li></ul><ul><li>• Types of applications. </li></ul><ul><li>• Analysis of methodologies that have been employed, and identification of deficiencies in methodology. </li></ul><ul><li>Proposal of “life cycle thinking” concept: using LCA as a tool for practical applications in the operation of a facility. </li></ul><ul><li>Multiple choice questions </li></ul>
  8. 8. Life Cycle Assessment T H E O R I G I N LCA has its roots in the 1960’s, when scientist concerned about the rapid depletion of fossil fuels developed it as an approach to understanding the impacts of energy consumption. In the early 1970’s, LCA’s concentrated mainly on energy and raw materials but later air emissions, water emissions and solid waste were included in the calculation.
  9. 9. T H E O R I G I N In the late 1970’s and early 1980’s, environmental concern shifted to issues of hazardous waste management. The 1990 SETAC conference in Vermont was the first to analyze LCA’s into three main stages: Inventory Interpretation Improvement Life Cycle Assessment
  10. 10. T H E O R I G I N <ul><li>This stages are: </li></ul><ul><li>Inventory – In which the data describing the system are collected and converted to a standard format to provide a description of the physical characteristics of the system of interest. </li></ul><ul><li>Interpretation – In which the physical data from the inventory are related to observable environmental problems. </li></ul><ul><li>Improvement – In which the system is modified in some way to reduce or ameliorate the observed environmental impacts. </li></ul>Life Cycle Assessment
  11. 11. Generally when using a LCA causes a rain of ideas that can help to see the problem from an extensive point of view. The LCA is a tool of support for the decision making. I N T R O D U C T I O N A fundamental part in the application of the LCA is that if a company makes and uses a LCA, in the long run is going to the same demand to its suppliers and clients within the commercial chain. Life Cycle Assessment
  12. 12. W H Y I S I T I M P O R T A N T ? Life Cycle Assessment <ul><li>The potential applications of LCA include (ISO 1997): </li></ul><ul><li>Identification of improvement opportunities for environmental aspects. </li></ul><ul><li>As a decision making tool in strategic planning, priorities definition and product or process design. </li></ul><ul><li>Selection and evaluation of relevant environmental performance indicators. </li></ul><ul><li>Marketing programs. </li></ul>
  13. 13. D E F I N I T I O N LCA is a quantitative process to evaluate the associate environmental loads to a product, process or activity identifying the use of mass and energy and the discharges to the surroundings; in order to determine it potential impact . Life Cycle Assessment Life Cycle : Consecutive and interlinked stages of a product or service system, from the extraction of natural resources to the final disposal.
  14. 14. D E F I N I T I O N The study takes in to account the stages of: extraction and processing of raw materials: production, transportation and distribution of raw materials and products; use, reusability and recycling and disposition of the remainder. Life Cycle Assessment
  15. 15. The ISO 14040 standard defines LCA as a compilation and evaluation of the inputs and outputs and the potential environmental impacts of a product system through its life cycle . The Life-Cycle Assessment framework as laid down in this standard is shown below: D E F I N I T I O N Life Cycle Assessment
  16. 16. The base of LCA consist of making a mass and energy balance of the studied system. This way the inputs and outputs are identified, and later the potential environmental impacts is evaluated that they can cause. D E F I N I T I O N Life Cycle Assessment A cradle-to-gate manner involves all the steps in the production, from raw material extraction and transport, to production and consumption, to re-use or disposal.
  17. 17. Life Cycle Analysis must be used cautiously, and in the interpretation of the impact assessment, care must be taken with subjective judgments. When first conceived, it was predicted that LCA would enable definitive judgments to be made. That misplaced belief has now been discredited. In combination with the trend towards more open disclosure of environmental information by companies, and the desire by consumers to be guided towards the least harmful purchases, LCA is a vital tool. Life Cycle Assessment D E F I N I T I O N
  18. 18. The ISO 14040 Family <ul><li>ISO 14040 : Environmental Management - LCA – Principles and Framework </li></ul><ul><li>ISO 14041 : Environmental Management - LCA– Goal and Scope Definition & Inventory Analysis </li></ul><ul><li>ISO 14042 : Environmental Management - LCA– Life Cycle Impact Assessment </li></ul><ul><li>ISO 14043 : Environmental Management - LCA– Life Cycle Interpretation </li></ul><ul><li>ISO 14047 : Illustrative Examples on how to apply ISO 14042 - Life Cycle Assessment – Life Cycle Impact Assessment </li></ul><ul><li>ISO 14048 : Environmental Management - LCA– Data Documentation Format </li></ul><ul><li>ISO 14049 : Environmental Management - LCA– Examples of Application of ISO 14041 to Goal and Scope Definition and Inventory Analysis </li></ul>
  19. 19. This international standard specifies the general framework, principles and requirements for conducting and reporting life cycle assessment studies. This international standard does not describe the life cycle assessment technique in detail. In this definition, it is clear that impact assessment is an integral part of LCA. ISO 14040 is an excellent compromise between that which makes up a Life Cycle Assessment and that which is to be achieved at all. ISO 14040 Environmental Management - Life Cycle Assessment – Principles and Framework
  20. 20. This international standard in addition to ISO 14040 specifies the requirements and procedures necessary for the compilation and preparation of the definition of the goal and scope of a Life Cycle Assessment study, and for performing, interpreting and reporting a Life Cycle Inventory analysis (LCI). This international standard does not describe the life cycle assessment technique in detail. ISO 14041 Environmental Management - Life Cycle Assessment – Goal and Scope Definition & Inventory Analysis
  21. 21. ISO 14042 describes and gives guidance on a general framework for the Life Cycle Impact Assessment phase (LCIA) of LCA as well as its key features and inherent limitations. It specifies requirements for conducting LCIA and its relationship to other LCA phases. The standard is supported with a technical report illustrating examples on how to apply ISO 14042. In the ISO 14042 document a large range of issues are mentioned that need to be decided and described. ISO 14042 Environmental Management - Life Cycle Assessment – Life Cycle Impact Assessment
  22. 22. This international standard provides requirements and recommendations for conducting the life cycle interpretation phase in LCA or LCI studies. This document is intended to provide guidance on the interpretation of LCA results in relation to the goal definition phase of the LCA study, involving review of the scope of the LCA. ISO 14043 Environmental Management - Life Cycle Assessment – Life Cycle Interpretation This international standard does not describe specific methodologies for the life cycle interpretation phase of LCA and LCI studies. This standard is short, clear and illustrated. The aim of the working group was to demonstrate that the LCA interpretation can be done simply, by referring essentially to common sense.
  23. 23. ISO/DTR 14047 Illustrative Examples on how to apply ISO 14042 - Life Cycle Assessment – Life Cycle Impact Assessment The purpose of this Technical Report is to provide examples to illustrate practice in carrying out a life cycle impact assessment according to ISO 14042. These examples are only a sample of the total possible examples that could satisfy the provisions of the standard. They should be read as offering “a way” or “ways” rather than the “unique way” of applying the standard. They `reflect the key elements of the life cycle impact assessment (LCIA) phase of the LCA. It should be noted that the examples presented in this technical report are not exclusive and that other examples exist to illustrate the methodological issues described.
  24. 24. ISO/TS 14048 Environmental Management - Life Cycle Assessment – Data Documentation Format This technical specification is applicable to the specification and structuring of questionnaire forms and information system. However, it can also be applied to other aspects of the management of the environmental data. The technical specification does not include requirements on completeness of data documentation. The data documentation format in independent of any software of database platform for implementation. The technical specification does not require any specific sequential, graphic or procedural solutions for the presentation or treatment of data, nor does it describe specific modeling methodologies for LCA and LCI data.
  25. 25. ISO/TR 14049 Environmental Management - Life Cycle Assessment – Examples of Application of ISO 14041 to Goal and Scope Definition and Inventory Analysis This technical report provides examples about practices in carrying out a Life Cycle Inventory Analysis (LCI) as means of satisfying certain provisions of the standard. They should be read as offering a way or ways rather than the unique way of applying the standard. Also they reflect only certain portions of an LCI study. It should be noted that the examples presented in this technical Report are not exclusive and that many other examples exist illustrated the methodological issues described. The examples are only portions of complete LCI studies.
  26. 26. Tier I : Contents <ul><li>Introduction and definition of the Life Cycle Assessment (LCA). • ISO 14040 guidelines. </li></ul><ul><li>Overview of 4 stages of life cycle methodology. </li></ul><ul><li>Survey of life cycle applications in the pulp and paper industry. • Types of applications. • Analysis of methodologies that have been employed, and identification of deficiencies in methodology. </li></ul><ul><li>Proposal of “life cycle thinking” concept: using LCA as a tool for practical applications in the operation of a facility. </li></ul><ul><li>Multiple choice questions </li></ul>
  27. 27. M E T H O D O L O G Y <ul><li>The ISO 14040 general framework of an LCA study consist of four steps: </li></ul><ul><li>Defining the goal and scope of the study. </li></ul><ul><li>Making a model of the product life cycle with all the environmental inflows and outflows. This is usually referred to as the life cycle inventory (LCI) stages. </li></ul><ul><li>Understanding the environmental relevance of all the inflows and outflows, this is referred to as the life cycle impact assessment (LCIA) phase. </li></ul><ul><li>The interpretation of the study. </li></ul>
  28. 28. M E T H O D O L O G Y Goal and scope Definition (ISO 14041) Inventory Analysis (ISO 14041) Impact Assessment (ISO 14042) Life Cycle Interpretation (ISO 14043) <ul><li>Direct application: </li></ul><ul><li>Product development </li></ul><ul><li>and improvement </li></ul><ul><li>Strategic planning </li></ul><ul><li>Public policy making </li></ul><ul><li>Marketing </li></ul><ul><li>Other </li></ul>Principles and Framework (ISO 14040) <ul><li>Other tools: </li></ul><ul><li>Techniques </li></ul><ul><li>Economic </li></ul><ul><li>Social </li></ul>
  29. 29. M E T H O D O L O G Y D E S C R I P T I O N The challenge for the LCA practitioner is to develop the models in such a way that the simplifications and thus uncertainties do not influence the result too much. The best way to deal with this problem is to carefully define a goal and scope of the LCA study before starting. The goal and scope definition is a guide that helps you to ensure the consistency of the LCA you perform.
  30. 30. M E T H O D O L O G Y D E S C R I P T I O N Example : LCA methodology was applied to Portuguese production of printing and writing paper in order to evaluate its environmental performance and also to make a comparative, environmental assessment of fuel oil and natural gas, respectively, as energy sources in the manufacturing process. (Lopes et al. 2003)
  31. 31. Goal & Scope Definition (ISO 14041). That is to state, the reasons of the study, the information that is expected to obtain, how it is going to be used, the intended audience of the report, the analysis of the scope and the limits of the system. M E T H O D O L O G Y Goal and Scope
  32. 32. M E T H O D O L O G Y Some LCA studies serve more than one purpose. The results may be both used internally and externally. In that case, consequences of such double use should be clearly described. ( Goedkoop and Oele. 2002) Defining the Goal The goal of any study shall unambiguously state the intended application, the reasons for carrying out the study and the intended audience, I.e. to whom the results of the study are intended to be communicated.
  33. 33. Defining the Goal M E T H O D O L O G Y <ul><li>It is obvious an LCA should have goal. However, in ISO there are some particular requirements as to the goal definition: </li></ul><ul><li>The application and intended audiences shall be described unambiguously. This is important, as a study that aims to provide data that is applied internally can be quite differently structured than a study that aims at making public comparisons between two products. </li></ul><ul><li>The reasons for carrying out the study should be clearly described. Is the commissioner or practitioner trying to prove something, is the commissioner intending to provide information only, etc. </li></ul>
  34. 34. M E T H O D O L O G Y Defining the Scope The scope of the study describes the most important methodological choices, assumptions and limitations. One starts with initial system boundaries and initial data quality requirements that can be adapted later if more information becomes available or necessary. The scope of any LCA study should be efficiently well defined to ensure that the breadth and the inherent detail in which the study is conducted are both compatible with and sufficient to address the stated study goal. ( Goedkoop and Oele. 2002)
  35. 35. <ul><li>Factors that should be considered and stated clearly in the Scope of Study include: </li></ul><ul><ul><ul><li>The function(s) of the system to be analyzed </li></ul></ul></ul><ul><ul><ul><li>The functional unit on which the study will be based </li></ul></ul></ul><ul><ul><ul><li>The system boundaries </li></ul></ul></ul><ul><ul><ul><li>Allocation procedures adopted </li></ul></ul></ul><ul><ul><ul><li>Data quality requirements </li></ul></ul></ul><ul><ul><ul><li>Any assumptions made </li></ul></ul></ul><ul><ul><ul><li>Study limitations </li></ul></ul></ul><ul><ul><ul><li>The type and format of the study reports </li></ul></ul></ul>M E T H O D O L O G Y Defining the Scope
  36. 36. M E T H O D O L O G Y Function, functional unit and reference flow A particularly important issue in product comparisons is the functional unit or comparison basis. In many cases, one cannot simply compare product A and B, as they may have different performance characteristics. Defining a functional unit can be quite difficult, as the performance of products is not always easy to describe. For instance, if the objective of the study is to compare paper towels with hand dryers, the function of these products is to dry hands and the functional unit can be defined as x pair of dried hands. Defining the Scope
  37. 37. M E T H O D O L O G Y Initial System Boundaries Defining the Scope <ul><li>Product systems tend to be interrelated in a very complex way. It is helpful to draw a diagram of the system and to identify the boundaries in this diagram. Important choices in this area are: </li></ul><ul><li>What is the boundary with nature? For example, in an LCA on paper it is important to decide if the growing of a tree is included. If it is, one can include the CO 2 uptake and the land use effect. </li></ul>
  38. 38. M E T H O D O L O G Y <ul><li>Will the production and disposal of capital goods be included? One can distinguish three orders: </li></ul><ul><li>First Order : Only the production of materials and transport are included. </li></ul><ul><li>Second Order : All processes during the life cycle are included, but the capital goods are left out. </li></ul><ul><li>Third Order : Now the capital goods are included. </li></ul>Defining the Scope
  39. 39. M E T H O D O L O G Y Defining the Scope Criteria for inclusion of inputs and outputs <ul><li>Apart from the criteria for system boundaries, one can also use a certain threshold below which you consider it is useless to collect data for an inflow or an outflow. ISO recommends using one or more of the following bases for such a threshold: </li></ul><ul><li>If the mass of the inflow is lower than a certain percentage. </li></ul><ul><li>If the economic value of an inflow is lower than a certain percentage of the total value of the product system. </li></ul><ul><li>If the contribution from an inflow to the environmental load is below a certain percentage. </li></ul>
  40. 40. M E T H O D O L O G Y Data Categories Defining the Scope It defines the kind of data necessary for the study. They can be collected at the production sites (i.e. primary data) or be obtained or calculated from published references or databases (i.e. secondary data). ISO recommends the use of primary data for those processes that contribute with most of the mass and energy flows or processes with significant environmental emissions (ISO 1999).
  41. 41. M E T H O D O L O G Y Defining the Scope Data Quality Requirements <ul><li>The quality of the data used in the life cycle inventory is naturally reflected in the quality of the final LCA. The data quality can be described and assessed in different ways. It is important that the data quality is described and assessed in a systematic way that allows others to understand and control the actual data quality. </li></ul><ul><li>Initial data quality requirements shall be established which define that following parameters: </li></ul><ul><ul><li>Time-related coverage . </li></ul></ul><ul><ul><li>Geographical coverage . </li></ul></ul><ul><ul><li>Technology coverage . </li></ul></ul>
  42. 42. M E T H O D O L O G Y Defining the Scope Data Quality Requirements <ul><li>In all studies, the following additional data quality indicators shall be taken into consideration in a level of detail depending on goal and scope definition: </li></ul><ul><ul><li>Precision </li></ul></ul><ul><ul><li>Completeness </li></ul></ul><ul><ul><li>Representativeness </li></ul></ul><ul><ul><li>Consistency </li></ul></ul><ul><ul><li>Reproducibility </li></ul></ul>
  43. 43. M E T H O D O L O G Y Defining the Scope Allocation <ul><li>ISO recommends the following procedure in order to deal with allocation issues: </li></ul><ul><li>Avoid allocation, by splitting the processes in such a way that can be described as two separated processes that each has a single output. </li></ul><ul><li>Another way to avoid allocation is to extend the system boundaries, and by including process is that would be needed to make a similar output. </li></ul><ul><li>If it is not possible to avoid allocation in either way, the ISO standard suggest allocating the environmental load based on a physical causality, such as mass or energy content of the outputs. </li></ul>
  44. 44. M E T H O D O L O G Y Defining the Scope If this procedure cannot be applied, ISO suggests using socio-economic allocation basis, such as the economic value. Although ISO mentions the socio-economic basis as a last resource, it is used very often. The advantage is that economic value is a good way to distinguish waste from an output, and it expresses the relative importance of an output.
  45. 45. M E T H O D O L O G Y Goal and Scope Definition : Example The purpose of this study is the identification and assessment of the environmental impacts associated with the production, use and final disposal of printing and writing paper produced in Portugal from Eucalyptus globulus and consumed in Portugal. System Boundaries
  46. 46. M E T H O D O L O G Y Goal and Scope Definition : Example <ul><li>In this example, the functional unit was defined as 1 tonne of white printing and writing paper, with a standard weight of 80 g/m 2 , produced from Portuguese Eucalyptus globulus kraft pulp and consumed in Portugal. </li></ul><ul><li>The impact assessment conducted in this study considers the following impact categories: </li></ul><ul><ul><ul><li>Global Warming potential for 100 years </li></ul></ul></ul><ul><ul><ul><li>Acidification </li></ul></ul></ul><ul><ul><ul><li>Eutrophication </li></ul></ul></ul><ul><ul><ul><li>Non-renewable resource depletion </li></ul></ul></ul><ul><ul><ul><li>Photochemical oxidant formation </li></ul></ul></ul>
  47. 47. ISO guidelines ; Inventory Analysis Phase of Life Cycle Assessment involving the compilation and quantification of inputs and outputs, for a given product system throughout its life cycle. (International Organization for Standardization 1997) Life Cycle Assessment
  48. 48. Inventory Analysis Inventory analysis is the stage in which data are collected and where calculations are performed in order to quantify the relevant inputs and outputs of the system as a whole. Typically, inventory data include raw materials and energy consumption, and the emission of solid, liquid and gaseous wastes. Inventory data may be provided for full life cycles or for partial life cycles. (Susan Svoboda, 1995) Raw Materials Energy Water Emissions to Air Releases to Water Solid Waste Usable Products Other Environmental Releases System Inputs Outputs M E T H O D O L O G Y Inventory Analysis
  49. 49. M E T H O D O L O G Y An important step in the inventory is the creation of a process flow diagram that will serve as the “blueprint” for the data to be collected. Each step in the system should be represented in the diagram, including the steps of the production of ancillary products such as chemicals and packaging. This step is important because it clearly depicts the relative contribution of each subsystem to the entire production system and the final product. Inventory Analysis
  50. 50. M E T H O D O L O G Y Inventory Analysis <ul><li>The following is a synopsis of the various issues that can be analyzed in an inventory analysis: </li></ul><ul><ul><ul><li>Data Collection </li></ul></ul></ul><ul><ul><ul><li>Refining System Boundaries </li></ul></ul></ul><ul><ul><ul><li>Calculation </li></ul></ul></ul><ul><ul><ul><li>Validation of Data </li></ul></ul></ul><ul><ul><ul><li>Relating data to the specific system </li></ul></ul></ul><ul><ul><ul><li>Allocation and Recycling </li></ul></ul></ul>
  51. 51. M E T H O D O L O G Y Inventory Analysis Data Collection Inventory Analysis involves data collection and calculation procedures to quantify relevant inputs and outputs of a product system. These inputs and outputs may include the use of resources and releases to air, water and land associated with the system. Interpretation may be draw from these data, depending on the goals and scope of the LCA. These data also constitute the input to the life cycle impact assessment. The qualitative and quantitative data for inclusion in the inventory shall be collected for each unit process that is included within the system boundaries. The procedures used for data collection may vary depending on the scope, unit process or intended application of the study.
  52. 52. M E T H O D O L O G Y Inventory Analysis Data Collection <ul><li>The technical specification provides comprehensive formats for data collection and treatment and the following concept can be used, </li></ul><ul><li>Description of the process as well as description of inputs and outputs. </li></ul><ul><li>Description of modeling and validation </li></ul><ul><li>Description and administrative information </li></ul>
  53. 53. M E T H O D O L O G Y Inventory Analysis Refining System Boundaries The system boundaries are defined as a part of the scope definition procedure. After the initial data collection, the system boundaries can be refined e.g. as a result of decisions of exclusion life stages or sub-systems, exclusion of material flows or inclusion of new unit processes shown to be significant according to the sensitivity analysis. The following is a synopsis of the various subsystems that can be analyzed in an inventory analysis:
  54. 54. M E T H O D O L O G Y Inventory Analysis Raw Materials Acquisition. Data are collected for this subsystems an all activities required to obtain raw materials, including transportation of the materials to the point of manufacture. The inventory should also include all inputs of energy, materials, and equipment necessary for acquiring each raw material. Because this dramatically increases the complexity of the analysis, criteria must be determined to eliminate insignificant contributions (usually any component contributing less than five percent of inputs might be ignored).
  55. 55. M E T H O D O L O G Y Inventory Analysis Product System . Data collected for this subsystem includes all energy, material, or water inputs and environmental releases that occur during the manufacturing processes required to convert each raw materials input into intermediate materials ready for fabrication. If industrial scrap is used in another subsystem, it is considered to the same consumption and emission rates required to produce that primary material.
  56. 56. M E T H O D O L O G Y Inventory Analysis Transportation/Distribution. An inventory of the related transportation activities of the product to warehouses and end-users maybe simplified by using standards for the average distance transported and the typical mode of transportation used. As in previous stages, clear boundaries must be established to define the extent to which issues such as building and maintaining transportation and distribution equipment will be included into the inventory results.
  57. 57. M E T H O D O L O G Y Inventory Analysis <ul><li>Consumer Use/Disposal. Data collected for this subsystem cover consumer activities including use (product consumption, storage, preparation, or operation), maintenance (repair) and reuse. Issues to consider when defining the scope of the subsystem include: </li></ul><ul><li>Time of product use before it is discarded </li></ul><ul><li>Inputs used in the maintenance process </li></ul><ul><li>The typical frequency of repair </li></ul><ul><li>Potential product reuse and recycling options </li></ul>
  58. 58. M E T H O D O L O G Y Inventory Analysis Calculation Procedures No formal demands exist for calculation in life cycle assessment except the described demands for allocation procedures. Due to the amount of data it is recommended as a minimum to develop a spreadsheet for the specific purpose. A number of general PC-programs/software for calculation are available e.g. spreadsheets/spreadsheet applications (EXCEL/Lotus etc), together with many software programs developed specially for life cycle assessment. The appropriate program can be chosen depending on the kind and amount of data to be handled.
  59. 59. M E T H O D O L O G Y Inventory Analysis Validation of Data <ul><li>The validation of data has to be conducted during the data collection process in order to improve the overall data quality. Systematic data validation may point out areas where data quality must be improved or data must be found in similar processes or unit processes. </li></ul><ul><li>For each data category and for each reporting location where missing data are identified, the treatment of the missing data should result in: </li></ul><ul><li>An acceptable reported data value; </li></ul><ul><li>A “zero” data value of justifies; or </li></ul><ul><li>A calculated value based on the reported values from unit processes employing similar technology. </li></ul>
  60. 60. M E T H O D O L O G Y Inventory Analysis Relating Data to the Specific System The fundamental input and output data are often delivered from industry in arbitrary units e.g. energy consumption as MJ/machine/week or emissions to the sewage system as mg metals/liter wastewater. For each unit process, an appropriate reference flow shall be determine (e.g. one kilogram of material or one mega joule for energy). The quantitative input and output data of the unit process shall be calculated in relation to this reference flow. Based on the refined chart and system s boundary, unit processes are interconnected to allow calculations of the complete system.
  61. 61. M E T H O D O L O G Y Inventory Analysis Allocation and Recycling When performing a life cycle assessment of a complex system, it may not be possible to handle all the impacts and outputs inside the system boundaries. This problem can be solved either by: 1. Expanding the system boundaries to include all the inputs and outputs, or by 2. Allocating the relevant environmental impacts to the studied system. Since the inventory is intrinsically based on material balances between inputs and outputs, allocation procedures should approximate as much as possible such fundamental input-output relationships and characteristics. Some principles should be kept in mind when allocating loadings
  62. 62. M E T H O D O L O G Y Inventory Analysis Allocation and Recycling <ul><li>Allocation can be necessary when dealing with: </li></ul><ul><li>Multi-output “black box” processes, i.e. when more than one product is produced and some of those product flows are crossing the system boundaries. </li></ul><ul><li>Multi-input processes, such as waste treatment, where a strict quantitative causality between inputs and emissions etc. seldom exists. </li></ul><ul><li>Open-loop recycling, where a waste material leaving the system boundaries is used as a raw material by another system, outside the boundaries of the studied system. </li></ul>
  63. 63. M E T H O D O L O G Y Inventory Analysis Recycling technology is expected to improve greatly in the future. Therefore, content levels and recycling rates should always be reported at current rates with documentation of study dates. Advances in technology will both increase rates and the number of products that are recyclable, altering both open-loop and closed-loop recycling options. Allocation and Recycling
  64. 64. M E T H O D O L O G Y Inventory Analysis : Example The production of Eucalyptus includes forest installation, forest growth and wood harvesting. Forest installation and growth comprises path opening, land preparation, soil preparation, deep fertilization, plantation, pest control, soil mobilization and soil fertilization.
  65. 65. M E T H O D O L O G Y Inventory Analysis : Example This subsystem includes pine growth and pine harvesting, 75% of which is done by regeneration felling and 25% by thinking.
  66. 66. M E T H O D O L O G Y Inventory Analysis : Example Data on the production of softwood pulp include the pulping process.
  67. 67. M E T H O D O L O G Y Inventory Analysis : Example <ul><li>To perform this study, two scenarios were defined: </li></ul><ul><li>Actual scenario (AS): Eucalyptus pulp and paper integrated production using heavy fuel oil. </li></ul><ul><li>Natural gas scenario (NGS): Eucalyptus pulp and paper integrated production using natural gas. </li></ul>
  68. 68. M E T H O D O L O G Y Inventory Analysis : Example The printing and writing paper production includes eucalyptus pulp transfer, softwood pulp bales pulping, pulp refining, cleaning, and screening, broke recovery, paper machine, finishing, wastewater treatment in an activated sludge plant and on site energy production.
  69. 69. M E T H O D O L O G Y Inventory Analysis : Example Final disposal alternatives in Portugal for printing and writing wastepaper are recycling (11%), landfilling (84%) and composting (5%).
  70. 70. M E T H O D O L O G Y Inventory Analysis : Example The production of hydrogen peroxide and sodium chlorate was included because, they are energy-insensitive process.
  71. 71. M E T H O D O L O G Y Inventory Analysis : Example Some subsystems purchase electricity from the national grid, while others have a surplus of electricity production.
  72. 72. M E T H O D O L O G Y Inventory Analysis : Example This subsystem includes the circulation, between subsystems, of wood, softwood pulp, paper, wastepaper, chemicals and fuels by 16 tonne, 28 tonne and garbage trucks, ocean ships and electric trains.
  73. 73. M E T H O D O L O G Y Inventory Analysis : Example The fuels considered are heavy fuel oil, light fuel oil, diesel oil and natural gas.
  74. 74. The purpose of Life Cycle Impact Assessment (LCIA) is to assess a system’s Life Cycle Inventory results with the aim of improving understanding with regard to their potential environmental significance. LCIA specifically uses impact categories and associated indicators to simplify LCI results with regard to one or more environmental issues. An LCA shall include LCIA to help identify potential environmental problems associated with various man-made activities. M E T H O D O L O G Y Impact Assessment
  75. 75. M E T H O D O L O G Y Impact Assessment <ul><li>Life Cycle Impact Assessment is defined as the phase in the LCA aimed at understanding and evaluating the magnitude and significance of the potential environmental impacts of a product systems. </li></ul><ul><li>Life Cycle Impact Assessment (LCIA) is the third phase in a life cycle assessment containing the following main issues: </li></ul><ul><li>Mandatory Elements </li></ul><ul><ul><li>Selection of impact categories and category indicators </li></ul></ul><ul><ul><li>Assignment of LCI results ( Classification ) </li></ul></ul><ul><ul><li>Characterization </li></ul></ul><ul><li>Optional Elements </li></ul><ul><ul><li>Normalization </li></ul></ul><ul><ul><li>Grouping </li></ul></ul><ul><ul><li>Weighting </li></ul></ul><ul><ul><li>Data Quality Analysis </li></ul></ul>
  76. 76. M E T H O D O L O G Y Impact Assessment An important step in an LCIA is the selection of the appropriate impact categories. The choice is guided by the goal of the study. It requires some expert judgment to make such a list, and to understand which impact categories should be defined to cover all these issues. An important help in the process of selecting impact categories is the definition of so-called endpoint . Endpoints are to be understood as issues of environmental concern, like human health, extinction of species, availability of resources for future generation. Endpoints can be selected by the practitioner, as long as the reasons for including or excluding endpoints are clearly documented. Selection of Impact Categories
  77. 77. M E T H O D O L O G Y Impact Assessment Selection of Impact Categories Category endpoints are variables which are of direct social concern, such as human life span, natural resources, valuable ecosystems or species, etc. The level of the endpoints is also called “damage level”. Category midpoints are variables in the environmental mechanism of an impact category between the environmental interventions and the category endpoints, like the concentration of toxic substances, the deposition of acidifying substances, etc. The level of midpoints is also called “problem level” (Udo de Haes et al. 1999a). According to ISO, the category indicator can be defined at any level of the environmental mechanism (ISO 2001a).
  78. 78. The inventory results of an LCA usually contains hundreds of different emissions and resource extraction parameters. Once the relevant impact categories are determined, these LCI results must be assigned to these impact categories. Once the impact categories are defined and the LCI results are assigned to these impact categories, it is necessary to define characterization factors. These factors should reflect the relative contribution of an LCI result to the impact category indicator result. M E T H O D O L O G Y Impact Assessment Selection of Impact Categories
  79. 79. M E T H O D O L O G Y Impact Assessment General overview of the structure of an impact assessment method. The LCI result are characterized to produce a number of impact categories indicators. According to ISO, one must document the environmental relevance of each indicator by describing the link to the endpoints. Selection of Impact Categories Endpoints Endpoints Midpoints Midpoints Inventory Inventory Ozone layer Ozone layer Acidification Acidification Climate Climate Land - use Land - use Nutriphication Nutriphication Ecotoxicity Ecotoxicity Carcinogen Carcinogen Smog Smog Radiation Radiation Minerals Minerals LCI results LCI results Fossil fuel Fossil fuel Environmental Mechanism Environmental Mechanism Reduced resource base Reduced resource base Dieing forest Dieing forest Cancer Cancer Extinction of species Extinction of species Seawar level Seawater level Respiratory deceases Respiratory deceases
  80. 80. M E T H O D O L O G Y Impact Assessment <ul><li>The impact category “human toxicological impacts” is one of the most difficult categories to handle. The potential effect on humans depends as for ecotoxicological impacts an the actual emission and fate of the specific substances emitted to the environment. </li></ul><ul><li>The human toxicological effects can be: </li></ul><ul><ul><ul><ul><ul><li>Acute toxicological effects </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>Irritation </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>Allergenic reactions </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>Genotoxicity </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>Cecinogenicity </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>Neurotoxicity </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>Teratogenicity </li></ul></ul></ul></ul></ul>Selection of Impact Categories
  81. 81. M E T H O D O L O G Y Impact Assessment The choice of the impact assessment method depends largely on the addressed audience.
  82. 82. M E T H O D O L O G Y Impact Assessment Assignment of LCI results (Classification) <ul><li>Assignment of LCI results to impact categories should consider the following, unless otherwise required by the goal and scope: </li></ul><ul><li>Assignment if LCI results which are exclusive to one impact category; </li></ul><ul><li>Identification of LCI results which relate to more than one impact category, including impact categories of human and acidification and </li></ul><ul><li>Allocation among serial mechanism, e.g. NO X may be assigned to ground level ozone formation and acidification. </li></ul><ul><li>Classification is a qualitative step based on scientific analysis of relevant environmental processes. The classification has to assign the inventory input and output data to potential environmental impacts i.e. impact categories. Some outputs contribute to different impact categories and therefore, they have to be mentioned twice. </li></ul>
  83. 83. M E T H O D O L O G Y Impact Assessment Characterization The method of calculating indicators results shall be identified and documented, including the value-choices and assumptions used. The usefulness of the indicator results for a given goal and scope depends on the accuracy, validity and characteristic of the models and characterization factors. The number and kind of simplifying assumptions and value-choices used in the characterization model for the category indicator will also vary between impact categories. A trade off often exist between characterization model simplicity and accuracy.
  84. 84. M E T H O D O L O G Y Impact Assessment Characterization <ul><li>Variation in the quality of indicators among impact categories may influence the overall accuracy of the LCA study, for example: </li></ul><ul><li>The complexity of the environmental mechanism between the system boundary and the category endpoint, </li></ul><ul><li>The spatial and temporal characteristics, for example the persistence of a substance in the environment, and </li></ul><ul><li>The dose-response characteristics </li></ul><ul><li>Calculation of indicator results occur in two steps: </li></ul><ul><li>Selection and use a characterization factor to convert the assigned LCI results to common units; </li></ul><ul><li>Aggregation of the converted LCI results into the indicator results. </li></ul>
  85. 85. M E T H O D O L O G Y Impact Assessment Normalization <ul><li>This procedure transform an indicator result by diving with a selected value. Some examples of reference values are </li></ul><ul><li>The total emissions or resource use for a given area which may be global, regional, national or local </li></ul><ul><li>The total emissions or resource use for a given area on per capita basis </li></ul><ul><li>A baseline scenario such as the indicator result under consideration divided by the calculated indicator result of a given alternative product system. </li></ul><ul><li>The selection of the reference system should consider the consistency of the spatial and temporal scales of the environmental mechanism and the reference value. </li></ul>
  86. 86. M E T H O D O L O G Y Impact Assessment Grouping <ul><li>Grouping is assigning impact categories into one or more sets, sets are predefined in the goal and scope, and it may involve sorting and/or ranking. Grouping is an optional element with two possible procedures: </li></ul><ul><li>To sort the impact categories on a nominal basis e.g. by characteristics such as emissions and resources or global, regional spatial scales; </li></ul><ul><li>To rank the indicators in a given order or hierarchy, e.g. medium and low priority. </li></ul><ul><li>Ranking is based on value choices. </li></ul>
  87. 87. M E T H O D O L O G Y Impact Assessment Weighting <ul><li>Weighting is the process of converting indicator results of different impact categories by using numerical factors based on values-choices. It may include aggregation of the weighted indicator results. Weighting is an optional element with two possible procedures: </li></ul><ul><li>To convert the indicator results or normalized results with selected weighting factors; </li></ul><ul><li>To possibly aggregate these converted indicator results or normalized across impact categories. </li></ul><ul><li>Weighting steps are based on value-choices and are not based on natural science. </li></ul>
  88. 88. M E T H O D O L O G Y Impact Assessment Weighting The application and use of weighting methods shall be consistent with the goal and scope of the LCA study and it shall be fully transparent. Different individuals, organizations and societies may have different preferences, therefore it is possible that different parties will reach different weighting results based on the same indicator results or normalized indicator results. In an LCA study it may be desirable to use several different weighting methods and to conduct sensitivity analysis to assess the consequences on the LCIA results of different value-choices and weighting methods.
  89. 89. Life Cycle Assessment Impact Assessment Elements of LCIA phase according to ISO 14042
  90. 90. ISO guidelines ; Impact Assessment Better understanding the reliability of the collection of indicator results, the LCA profile. (International Organization for Standardization 2000) Data quality analysis Convert and possibly aggregating indicator results across impact categories using numerical factors based on values-choice. (International Organization for Standardization 2000) Weighting Sorting and possibly ranking of the impact categories. (International Organization for Standardization 2000) Grouping Calculation of the magnitude of category indicator relative to reference information. (International Organization for Standardization 2000) Normalization LCIA – Optional Elements Calculation of category indicator results. (International Organization for Standardization 2000) Characterization Assignment of LCI results. (International Organization for Standardization 2000) Classification Class representing environmental issues of concern to which LCI results may be assigned. (International Organization for Standardization 2000) Impact Categories LCIA – Mandatory Elements Life Cycle Assessment
  91. 91. M E T H O D O L O G Y Impact Assessment : Example The next table shows the inventory parameters considered in this study and the impact categories selected for analysis. In the next step of impact assessment (characterization), the total potential contribution from all inputs and outputs to the different impact categories is calculated using characterization factors. Impact categories and corresponding parameters. Non-renewable CO2, CH4, N2O SO 2 , NO x , HCL, NH 3 , HF, H 2 S NO x air, NH 3 air, N water, NO 3 - water, NH 4 + water, P water, PO 4 3- water COD water Crude oil, Natural gas, Coal CH 4 , Halogenated hydrocarbons, Aromatic hydrocarbons. Global Warming, 100 years (GW) Acidification (A) Eutrophication (E) Non-renewable resource depletion (NRRD) Photochemical oxidant formation (POF) Parameters Impact Category
  92. 92. Interpretation (ISO 14043). Is a systematic procedure to identify, qualify, check and evaluate information from the conclusions of the inventory analysis and/or impact assessment of a system and present them in order to meet the requirements of the application as described in the goal and scope of the study. Interpretation is performed in interaction with the three other phases of the life cycle assessment. If the results of the inventory analysis or the impact assessment is found not to fulfill the requirements defined in the goal and scoping phase, the inventory analysis must be improved by e.g. revising the system boundaries, further data collection etc. followed by an improved impact assessment. M E T H O D O L O G Y Interpretation
  93. 93. M E T H O D O L O G Y Interpretation This iterative process must be repeated until the requirements id the goal and scoping phase are fulfilled as can be described by the following steps ( Goedcoop and Oele. 2002) : 1. Identify the significant environmental issues. Evaluate the methodology and results for completeness, sensitivity and consistency. 2. Check that conclusions are consistent with the requirements of the goal and scope of the values and application oriented requirements. 3. If so, report as final conclusions. If not, return to step 1 or 2. 4. This procedure has to be repeated until 3 is fulfilled.
  94. 94. M E T H O D O L O G Y Interpretation <ul><li>Interpretation is the fourth in life cycle assessment containing the following main issues: </li></ul><ul><li>Identification of significant environmental issues. </li></ul><ul><li>Evaluation which considers completeness, sensitivity and consistency checks </li></ul><ul><li>Conclusions, recommendations and reporting </li></ul>
  95. 95. M E T H O D O L O G Y Interpretation Identification of significant environmental issues. <ul><li>The objective of this step is to structure the information from the inventory analysis and – if additionally conducted – from the life cycle impact assessment phase in order to determine the significant environmental issues in accordance with the goal and scope definition. </li></ul><ul><li>The identification step include structuring and presentation of relevant information: </li></ul><ul><li>Results from the different phases i.e. presentation of e.g. data from inventory analysis in tables, figures or diagrams etc. or presentation of results of the impact assessment . </li></ul><ul><li>Methodological choices </li></ul><ul><li>Valuation methods used </li></ul><ul><li>Role and responsibility if different interested parties. </li></ul>
  96. 96. M E T H O D O L O G Y Interpretation Evaluation <ul><li>The objective of this step is to establish confidence in the result of the study, based on the preceding LCA phases, and on the significant environmental issues identified in the first step of the interpretation. The results should be presented in such a form as to give the commissioner or any interested party a clear and understandable view of the outcome of the study. </li></ul><ul><li>The interpretation made at this stage shall be reinforced by the facts and calculations bought forward in at least the three following elements: </li></ul><ul><ul><ul><ul><ul><li>Uncertainty Analysis </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>Sensitivity Analysis </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>Contribution Analysis </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>Gravity Analysis </li></ul></ul></ul></ul></ul>
  97. 97. M E T H O D O L O G Y Interpretation Types of Uncertainties in LCA and Existent Frameworks for their Assessment Parameter Uncertainty It includes the uncertainty on the inventory data and the data used for the calculation of impact assessment factors (i.e. characterization, normalization and weighting). Sources of parameter uncertainties are (Huijbregts 1998a): lack of data, inaccuracy and unrepresentativity. LCA practitioners mostly have to deal with parameter uncertainties on inventory data that they collect and model in order to study a system. For such purposes several frameworks have been proposed (Huijbregts 2001b, Maurice 2000, Huijbregts 1998b, Weidema 1996).
  98. 98. M E T H O D O L O G Y Interpretation Types of Uncertainties in LCA and Existent Frameworks for their Assessment To fill data gaps in life cycle inventories, it has been recommended the use of mass and energy balances or models that calculate direct and indirect emissions and resources using the estimated price of missing flows as input. Missing data can also be estimated by using information for the most similar process or product for which data are available or for the main ingredients of the product. This kind of sources may also be used to further specify sum parameters (e.g. hydrocarbon emissions) (Huijbregts et al 2001b). Monte Carlo simulation is usually recommended to assess the inaccuracy and representativity of the inventory data (Huijbregts et al 2001b, Maurice et al 2000, Huijbregts 1998b). However, in practice it is be very difficult to obtain the uncertainty distributions for the large amount of parameters included in the inventory analysis.
  99. 99. M E T H O D O L O G Y Interpretation Types of Uncertainties in LCA and Existent Frameworks for their Assessment Therefore, a prior identification of key parameter is proposed by means of a broad sensitivity analysis using standard uncertainty estimates (Sakai et al 2002, Heijungs 2001, Heijungs 1996). However, a disadvantage of using a standard sensitivity range is that parameters with a minor contribution to LCA outcomes but with a large unknown uncertainty range are eliminated from the analysis (Huijbregts 1998b). An alternative approach is to identify the key input parameters based on the contribution of input data to the results and a qualitative assessment of the data uncertainty (Maurice et al 2000). Contributions can be calculated from current LCA software and uncertainty can qualitatively be assessed using data quality indicators (i.e. ordinal scale with numbers ranging from 1 to 5) (Weidema 1998).
  100. 100. M E T H O D O L O G Y Interpretation Types of Uncertainties in LCA and Existent Frameworks for their Assessment After the key input parameters have been identified, a quantitative uncertainty analysis can still remain complicated because of lack of knowledge about actual uncertainty of input data. One alternative can be the use of expert judgement to estimate uncertainty ranges (Huijbregts 2001) or different proposed guidelines for parameters extensively measured and data based on little information (Maurice 2000, Finnveden 1998, Hanssen et al 1996). The assessment of the uncertainty of characterization factor on the LCA study outcomes has been illustrated for the comparison of insulation thickness in buildings (Huijbregts 2001a), but there is no evidence of its inclusion in real studies because uncertainty of characterisation factors is generally unknown.
  101. 101. M E T H O D O L O G Y Interpretation Types of Uncertainties in LCA and Existent Frameworks for their Assessment Model developers generally do not provide quantitative information about parameter uncertainty, except for some references about midpoint modeling of toxicity potentials (Hertwich et al 2000, Huijbregts et al 2000, Hertwich et al 1999). Because normalization and weighting are optional steps and the methodological choices involved in their application are supposed to have a stronger effect on the study results, parameter uncertainty of the normalization and weighting factors are not covered on the literature.
  102. 102. M E T H O D O L O G Y Interpretation Types of Uncertainties in LCA and Existent Frameworks for their Assessment Uncertainty due to Choices Several choices are made when performing LCA studies (e.g. system boundaries, allocation rules, characterization models, weighting factors, etc.). The use of guidelines such as SETAC Best Available Practices (Udo de Haes et al 2002) and ISO standards (ISO 1997, ISO 1999, ISO 2001a, ISO 2001b) as well as the peer-review processes are useful practices to reduce uncertainty due to choices (Huijbregts 1998a). Uncertainties due to choices can be quantitatively assessed as it has been illustrated for the comparison of two types of roof gutter, where the combined effect of parameter uncertainty and uncertainty due to choices in inventory data and characterization factors were calculated (Huijbregts 1998b).
  103. 103. M E T H O D O L O G Y Interpretation Types of Uncertainties in LCA and Existent Frameworks for their Assessment Model Uncertainty There are model uncertainties in LCA studies due to the lack of temporal and spatial variability as well as the linearity in the assessment, model uncertainties on the simplified environmental models used to calculate characterization factors, etc. At present, model uncertainty assessment has not been made operational in LCA case studies (Huijbregts 1998b).
  104. 104. M E T H O D O L O G Y Interpretation <ul><li>All these factors can have very significant impacts on the result. The only way to deal with them is in the uncertainty analysis. Uncertainty caused by incompleteness refers to the unavoidable data gaps. Important issues are: </li></ul><ul><li>System Boundaries, as we have discussed above it is not easy to apply consistent boundaries and cut of criteria. </li></ul><ul><li>Incomplete data sheets and insufficiently specified data. In many cases, data is gathered from interviews and through questionnaires, and often data will be partially available. A particular problem is that often data is gathered in sum parameters. </li></ul><ul><li>Mismatch between inventory and impact assessment. In many cases, inventory data that is collected does not have a characterization factor, and therefore this finding is ignored in the rest of the LCA. </li></ul>
  105. 105. M E T H O D O L O G Y Interpretation Sensitivity Analysis The ISO 14043 prescribes that sensitivity analysis should focus on the most significant issues, to determine the influence on variations in techniques, methods and data. Tornado diagrams illustrate the changes in output parameter values for equal levels of change in input parameters. The model is run with low and high values for each parameter while all other parameters are held constant. The result are presented in lying bar graphs, the top bar representing the output range of the most sensitive parameter, and the bottom bar representing the least sensitive parameter, giving a graph shaped like an upside down triangle, hence the simile to a tornado.
  106. 106. M E T H O D O L O G Y Interpretation Sensitivity Analysis One-way sensitivity analysis determines the amount an individual input parameter value needs to change, all other parameters held constants, in order for output parameter values to change by a certain percentage. Scenario analysis . Scenarios in LCA studies are descriptions of possible future situations, based on specific assumptions about the future, and are characterized by choice of system boundaries, allocation methods, technology, time, space, characterization methods, and weighting methods.
  107. 107. M E T H O D O L O G Y Interpretation Sensitivity Analysis In Ratio sensitivity analysis , which is applicable only in comparative studies, a ratio is calculated to determine the percentage an input parameter value need to change in order to reverse rankings between two alternatives. The sensitivity is expressed as the ratio of the difference between alternatives over individual process component. The Critical error factor (CEF) is a measure of the sensitivity of a priority between two alternatives to an input parameter value x . It is calculated as the ratio of the critical error  x , i.e. variation in x required to bring about a change in priority, over the value of x, i.e. CEF=  x / x .
  108. 108. M E T H O D O L O G Y Interpretation Contribution Analysis An important tool in understanding the contribution of your results is the use of the contribution analysis. With such analysis, you determine which processes are playing a significant role in your results. With the information you can focus your attention on these processes, and analyze if these processes are sufficiently representative, complete and if there are important assumptions within these processes.
  109. 109. M E T H O D O L O G Y Interpretation Gravity Analysis Contribution analysis shows which processes create high environmental load. However this does not reveal the cause of the load. In gravity analysis we can look at the interrelations between the processes and show which processes are in fact responsible for the load, while these processes in themselves may have low emissions.
  110. 110. M E T H O D O L O G Y Interpretation Conclusions and Recommendations The final step of the interpretation is more or less similar to the traditional concluding and recommending part of a scientific and technical assessment, investigation or alike. The aim of this third step of the interpretation is to reach conclusions and recommendations for the report of the LCA study or life cycle inventory study. This step is important to improve the reporting and the transparency of the study. Both are essential for the readers of the LCA report.
  111. 111. ISO guidelines ; Interpretation The objective of this third element of the life cycle interpretation is to draw conclusions and make recommendations for the intended audience of the LCA or LCI study. (International Organization for standardization 2000) Conclusion and recommendations Process of verifying that the information obtained from a sensitivity analysis is relevant for reaching the conclusion and giving recommendations. (International Organization for standardization 2000) Sensitivity analysis Process of verifying that the assumptions , methods and data are consistently applied throughout the study and in accordance with the goal and scope definition. (International Organization for standardization 2000) Consistency study Process of verifying whether information for the preceding phases on an LCA or an LCI study id sufficient for reaching conclusions in accordance with the goal and scope definition. (International Organization for standardization 2000) Completeness study To structure the results from the LCI or LCIA phases in order to determine the significant issues, in accordance with the goal and scope definition and interactively with the evaluation element. (International Organization for standardization 2000) Significant points identification Life Cycle Assessment
  112. 112. M E T H O D O L O G Y Interpretation : Example It is possible to make a first interpretation at the inventory analysis level based on individual parameters. The next figures show the energy consumptions, the air emissions and the water emissions at the different stages of the paper life cycle, for the actual scenario and for the natural gas scenario. It important to note that only the CO 2 originated during the combustion of non-renewable fuels (non-renewable CO 2 ) was considered, since one of the assumptions of this study is that the CO 2 released from renewable sources (renewable CO 2 ) is balanced by CO 2 absorption in the forest.
  113. 113. M E T H O D O L O G Y Interpretation : Example
  114. 114. M E T H O D O L O G Y Interpretation : Example
  115. 115. M E T H O D O L O G Y Interpretation : Example
  116. 116. M E T H O D O L O G Y Interpretation : Example Based on the inventory analysis and impact assessment results: The printing and writing paper production is the most important contributor to non-renewable CO 2 emissions due to on-site energy production. Although the eucalyptus pulp production is the largest consumer of energy throughout the paper life cycle, its contribution to air emissions is not predominant. The final disposal stage assumes a predominant role in global warming and photochemical oxidants formation impact categories, as a result of the CH 4 emissions in landfilling. Transport is the main source of NO x emissions, resulting in an important contribution to the eutrophication and acidification impact categories. The contribution of the remaining stages of the paper life cycle to the impact categories is not relevant.
  117. 117. Benefits and Limits of LCA Methodology Life Cycle Assessment <ul><li>LCA is the only tool that can be used for product comparisons over the whole life cycle (Finnveden 2000). The main benefits from using this methodology have been highlighted by ISO and SETAC as (Owens 1999): </li></ul><ul><li>Quantifying material and energy efficiency for a system. </li></ul><ul><li>Identifying improvement opportunities and trade-offs. </li></ul><ul><li>Illuminating hidden or unrecognized issues. </li></ul><ul><li>Promoting a wider communication about how to compare and improve highly complex and difficult to analyze industrial systems. </li></ul>
  118. 118. Benefits and Limits of LCA Methodology Life Cycle Assessment However, LCIA addresses only the environmental issues that are identified in the goal and scope, therefore, is not a complete assessment of all environmental issues. Furthermore, LCIA is fundamentally an analysis of inputs from and outputs to the environment rather than an analysis of the actual environmental consequences or effects from a system. Impact Assessment modeling in LCA involve in some cases highly simplified assumptions about complex environmental processes (e.g. eco-toxicity) and there are also difficulties in dealing with spatial, temporal and dose-response issues (Owens 1999).
  119. 119. Benefits and Limits of LCA Methodology Life Cycle Assessment Therefore, even for comparisons it has been suggested complementing LCA results with absolute approaches of other techniques, (e.g. risk assessment). The system-wide, relative LCA approach can be seen to identify and analyse possible system issues and trade-offs, where absolute tools would analyse in detail the issues raised by LCA (Owens 1999). Others limitations of the methodology include the uncertainty of the results due to data gaps, data uncertainties, methodological choices and values. However, these are relevant also for other environmental tools (Finnveden 2000).
  120. 120. Interaction (Value) of LCA with other PI tools Life Cycle Assessment Process Simulation Process Data Process Models Validation On-line Data Collection/Analysis Data Driven Process Modeling Capital Effectiveness Analysis Heat & Mass Exchange Networks Business Modeling Supply Chain Integrated Process Design & Control
  121. 121. Interaction (Value) of LCA with other PI tools Life Cycle Assessment Process Simulation Process Data Process Models Validation On-line Data Collection/Analysis Data Driven Process Modeling Capital Effectiveness Analysis Heat & Mass Exchange Networks Business Modeling Supply Chain Integrated Process Design & Control Process simulation data can be used into a LCA model in order to assess environmental impacts.
  122. 122. Interaction (Value) of LCA with other PI tools Life Cycle Assessment Process Simulation Process Data Process Models Validation On-line Data Collection/Analysis Data Driven Process Modeling Capital Effectiveness Analysis Heat & Mass Exchange Networks Business Modeling Supply Chain LCA results can be used as a complement to capital effectiveness analysis in order to show the impact of a project on the environment. Integrated Process Design & Control
  123. 123. Interaction (Value) of LCA with other PI tools Life Cycle Assessment Process Simulation Process Data Process Models Validation On-line Data Collection/Analysis Data Driven Process Modeling Capital Effectiveness Analysis Heat & Mass Exchange Networks Business Modeling Supply Chain Heat and mass integration will identify the optimal pollution prevention strategies from a process perspective. The utilization of LCA will demonstrate if the improvements are beneficial from a product perspective. It can also be used to communicate these improvements to the public. Integrated Process Design & Control
  124. 124. Interaction (Value) of LCA with other PI tools Life Cycle Assessment Process Simulation Process Data Process Models Validation On-line Data Collection/Analysis Data Driven Process Modeling Capital Effectiveness Analysis Heat & Mass Exchange Networks Business Modeling Supply Chain Integrated Process Design & Control Business modeling look simultaneously at the process, economic and environmental dimension. LCA can be used as a framework to modelize the environmental dimension. Both LCA and Supply Chain Management are going beyonfd the firm boundaries, so there are a lot of opportunities to use them together.
  125. 125. Tier I : Contents <ul><li>Introduction and definition of the Life Cycle Assessment (LCA). </li></ul><ul><li>• ISO 14040 guidelines. </li></ul><ul><li>Overview of 4 stages of life cycle methodology. </li></ul><ul><li>Survey of life cycle applications in the pulp and paper industry. • Types of applications. </li></ul><ul><li>• Analysis of methodologies that have been employed, and identification of deficiencies in methodology. </li></ul><ul><li>Proposal of “life cycle thinking” concept: using LCA as a tool for practical applications in the operation of a facility. </li></ul><ul><li>Multiple choice questions </li></ul>
  126. 126. LCA is a potentially a powerful tool for evaluating the environmental performance of pulp and paper products. This work show the range applications of LCA in the pulp and paper industry and the methodologies used by analysis of the literature. The authors highlight certain of the limitations of LCA, and identify its potential as a tool for demonstrating continuous improvement at mills. Pulp & Paper Industry Life Cycle Assessment
  127. 127. Survey of applications <ul><li>33 studies have been investigated in order to draw a picture of LCA applications in the pulp and paper industries. These applications were divided in the followings fields: </li></ul><ul><li>Product comparisons </li></ul><ul><li>Process analysis and benchmarking </li></ul><ul><li>Comparison of improvement options for a given product or process </li></ul><ul><li>Evaluation of new products </li></ul><ul><li>Strategic evaluation </li></ul><ul><li>The next figure shows the repartition of the studies between those fields. The sum is higher of 34 because some of the studies cover more than one field of application. </li></ul>Life Cycle Assessment
  128. 128. Survey of applications Life Cycle Assessment It also shows that, even if product comparisons were the primary purpose of LCA, this methodology is more and more used for environmental process analysis and comparison of process options. Since pulp and paper is an old industry that reaches “steady state” regime, it is not a lot involved with Greenfield design. For this reason, LCA has not been integrated in the design phase of this industry. LCA begins to be utilized to performed strategic evaluation like environmental assessment en EMS. All these applications will be discussed later.
  129. 129. Survey of applications Breakdown of Studies by Field of Application Life Cycle Assessment
  130. 130. It also possible to classify these studies by the type of publications, such as: case studies, methodological approaches, methodology illustrated by a case study, review of previous work and industrial experience with LCA. Papers or conference proceedings presenting an individual company’s experiences with the utilization of LCA are classified in this last category. The classifications are show in the next figure. Type of Publication Survey of applications Life Cycle Assessment
  131. 131. Survey of applications Some countries are more advanced than others concerning the development of LCA methodology and its application. In fact, even of some studies were applied to some specific countries, it is the countries from where the study was performed that is considered here. Japan studies had not been considered here but they would represent a high percentage if they were. In fact, Japan is far more advanced in terms of general LCA development and utilization in comparison to other countries European ones. Japan’s Ministry of Economy, Trade and Industry (METI) has launched in 1998 a national project, “Development of Assessment Technology of Life Cycle Environment Impacts of Products”. The objective of the LCA Project is to develop a highly reliable LCA could be due to the fact that greater concern has arisen from demographic and natural resources issues, than say in North America. Life Cycle Assessment
  132. 132. Country of Origin of LCA studies Survey of applications Life Cycle Assessment
  133. 133. Survey of applications It is also possible to classify LCA studies by the type of organizations they come from. The classification is show in the next figure. The figure shows that most of the studies come from the university sector, This could be explained by the fact LCA is still a methodology under development. Groups performing LCA studies Life Cycle Assessment
  134. 134. Survey of applications The next figure illustrates who did what. We can see that consulting companies have mostly implied in product comparison. The interest of industrial side is more related to the processes and the strategic evaluation because they have to meet regulations and want to have a better concurrent position on the market. Government touches to all preceding categories. Work Breakdown Life Cycle Assessment
  135. 135. Survey of applications The next figure shows that the application of each study, and its conclusions, are generally well defined. Legend Yes: Activity is defined in the publication Not done: It is clear that the activity has not been done No info: There is no info about the activity in the publication Life Cycle Assessment
  136. 136. Survey of applications LCA General application in the Pulp and Paper Industry LCA <ul><li>Products Comparison </li></ul><ul><li>Analysis of the origins of environmental impacts related to a particular product </li></ul><ul><li>Comparison of improvement variants of a given product or process, or alternative process technologies </li></ul><ul><li>Evaluation of new products and product management (Product Stewardship) </li></ul><ul><li>Strategic policy development </li></ul>Life Cycle Assessment
  137. 137. Survey of applications Comparison of Products with the Same Function LCA is used for the comparison of paper products with alternatives. This section intended to highlight problems encountered when using LCA to compare different products with the same function. Examples of product comparison are presented in the next tables. Product Comparison : Paper vs. Polyethylene (PE) Bags At the time this study were performed, there was no well-accepted methodology. Three companies were respectively responsible for the inventory, the impact assessment and the critical analysis. Life Cycle Assessment Paper is worse concerning: Climate change: ozone depletion; ecotoxicity: land use; mineral depletion. Plastic is worse concerning: Fossil fuel depletion at high use ratios. Comparison of industrial paper and PE sacks. Eurosac (1993) France PE is worse concerning: Non-renewable energy; abiotic resource depletion; GW; photoquemical oxidant; acidification; air and water emissions; pollution of aquatic system. Paper is worse concerning: Eutrophication. Comparison of paper and PE check out bags in United States using a resource and profile analysis (REPA) or LCI. Franklin Associates (1990) USA Main Conclusions Objectives References
  138. 138. Product Comparison : Towels vs. Air Driers Product Comparison : Disposable vs. Cloth Diaper Survey of applications The authors stresses that REPA (LCI) should not be used to find a winner or a looser but to identify possible improvements. Cloth and disposable diapers are difficult to compare due to the incompleteness of the information and the inability to weight environmental effects against each other. Life Cycle Assessment The authors emphasise that the results from this study were applicable only for the case defined by assumptions. Environmental footprint for air driers is smaller than the paper towels. Use of dries results in lower GW, acidification ecotoxicity, human toxicity, nutrification, ozone depletion and photoquemical smog burdens. Comparison of paper towel and air dryers in United Kingdom (UK) Environment al resources Management (2001) UK Main Conclusions Objectives References With good laundry practices, cloth diapers contribute less to GW and acid rain and use less energy. Phosphorus and other discharges are higher for cloth diapers, and cotton cultivation may no be sustainable. Disposable diaper consumes a lot of fossil fuel. Comparison of disposable and cloth diapers. Milj ökonsult and Svensson (1993) Sweden Cloth diapers use more energy and water than disposable. Disposable diapers generated more solid wastes. Air and water emissions are considered equivalent for both product. Assessment of the energy usage, water requirement, solid waste, atmospheric emission and water emissions generated by disposable and cloth diapers. Sauer et al. (1994) USA Main Conclusions Objectives References
  139. 139. Product Comparison : Paper vs. Polystyrene Egg Packaging Survey of applications Product comparison is undoubtedly the application that is the most sensitive to LCA’s limitations. The results to two different studies on the same products could seem to have contradictory results. The result from an LCA cannot be generalized, and are very specific to the defined goal and scope. For this reason, some authors recommend that LCA should not been used perform product comparison but only to improve the processes. The authors recognize the importance of the accuracy of the input data. Life Cycle Assessment The application of the LCA procedure to polystyrene and recycled paper egg packaging does not provide a clear-cut answer for defining the friendlier product, but it seems that the polystyrene carton has a higher environmental impact. Comparison of paper and polystyrene for egg packaging. Zabanioyou and Kassisi (2003) Greece Main Conclusions Objectives References
  140. 140. Survey of applications Process Analysis and Benchmarking Process analysis and benchmarking consist in the determination of the contribution of each stage to different impact categories, to the utilization of LCA as an environmental benchmark method, and to the optimization of resources and energy. Examples of these are presented in the next tables. Process Analysis and Benchmarking : Overall Process Evaluation As a result of this study, LCA became part of their environmental program. Life Cycle Assessment Performing LCA on the virgin and recycled paper gave the Visy company a true picture of its mills in terms of GHG emissions. Illustration of how LCA could be used to find opportunities for environmental improvement, more specifically for reducing GHG emissions. Wiegard (2001) Australia Main Conclusions Objectives References
  141. 141. Survey of applications Process Analysis and Benchmarking : Evaluation of Emissions along the Paper Cycle Process Analysis and Benchmarking : Resources and Energy Optimization The result can change if clean energy is used in the process. Modeling techniques and scenario-type sensitivity analysis are helpful to answer questions with a high level of complexity and uncertainty. Life Cycle Assessment Fossil CO 2 , SO 2 and NOx are the emissions that are the most influenced by transport. The vehicle used has more impact than the distance (except for long-sea trip). Paper production is the major contributor to CO 2 and SOx. Evaluation of the contribution of transportation to the overall environmental impact of the paper chain. Pajula, Kutinlahti, and Wessman (2001) Main Conclusions Objectives References Environmental benefits of reducing consumption of paper and improving technology is greater than increasing recycling. Life-Cycle material and energy analysis for the pulp and paper cycle in the United Kingdom for the period between 1987 and 1996, and modelisation of future trends in material and energy flows until 2010. Sundin et al. (2002) UK Main Conclusions Objectives References
  142. 142. Survey of applications Process Analysis and Benchmarking : Asset Evaluation Many examples show that LCA is a useful tool for investigating environmental strengths and weaknesses along the life cycle of a process or product and identifying stages of production which cause the most impacts. LCA is useful for identifying and assessing the environmental impacts of a product and to improve the management control of the plant. Incorporation of time dimension in LCA increases its utility as decision-making tool. Life Cycle Assessment Life cycle of equipment must be considered over its entire lifetime and that its environmental impacts could change in time. Evaluation of different scenarios over time concerning the life cycle of a paper machine. Vasara and Jallinoja (1997) Finland Main Conclusions Objectives References
  143. 143. Survey of applications Comparison of Improvement Options for Given Product or Process Once processes are benchmarked, LCA can be use for the evaluation of improvement variants. The comparison of these with the benchmark and with each other shows the best opportunities for improvement. The example below shows that LCA can give a clear answer to a defined problem, but under certain conditions. Comparison of Waste Management Scenarios Because of the uncertainty in the data, results were only indicative. Life Cycle Assessment Options other than landfill reduce GHG emissions. Waste-to-energy recovery is the most effective. Investigation of various waste management options in order to reduce GHG emissions from paper. Pickin, Yuen and Hennings (2002) Australia Main Conclusions Objectives References
  144. 144. Survey of applications Comparison of Waste Management Scenarios Comparison of Improvement options for a given product or process : Bleaching Processes Results from LCA should not be used alone for decision-making. Technical, operational and economic reliability should be taken into consideration. LCA methodology alone is not enough to compare these two process alternatives. The outcomes of combined LCA, risk assessment and exposure-based assessment provide a better picture. Life Cycle Assessment Recycling avoid virgin material use and impacts related to landfills. Determination or the Environmental benefits of recycling. Grant et al. (2001) Australia Main Conclusions Objectives References FWA production uses less energy and causes lower air and COD emissions but higher AOX emissions. Comparison of environmental performance of fluorescent whitening agents (FWAs) with peroxide bleaching of mechanical pulp using LCA Sheringer, Halder and Hungerb ü ler (2000) Switzerland Main Conclusions Objectives References
  145. 145. Survey of applications Recycling problems are quite complex to analyze using LCA. For this reason, several authors tried to develop LCA methodologies that are specific to recycling characteristics. LCA is not sufficient to answer complex question related to process alternatives, because some impacts are not well addressed. The author recommends to combine LCA with risk assessment and exposure-based assessment. Comparison of Improvement options for a given product or process : Energy Alternatives LCA is the most appropriate tool to evaluate the global impact of process modifications. Life Cycle Assessment Substituting HFO by natural gas in the pulp and paper production process is a good environmental solution when combined with cogeneration. Assessment of the replacement of heavy fuel oil (HFO) by natural gas and cogeneration in the manufacturing process of paper made from Eucalyptus globulus pulp. Lopes et al. (2003) Portugal Main Conclusions Objectives References
  146. 146. Survey of applications LCA only guides decision-makers in the assessment and selection of technologies based on environmental performance. The methodologies used and their advantages are presented in the next table. Life Cycle Assessment Ensures the consistency with defined boundary conditions throughout the study. Consistency analysis. Enables the identification and management of data gaps, inconsistencies and errors. Data quality analysis. Enables to test the impact of assumptions, condition and data that have the ability to affect the results and conclusions of the study. Sensitivity analysis. Integrates economic considerations in the decision. Environmental-economic valuation model. Gives the relative significance of this system to the overall loads. Normalization to national or global impact categories totals. Enables the decision-maker too chose the best option based on this environmental priorities. Ranking of scenarios in term of environmental impact categories. Advantage Methodology
  147. 147. Survey of applications Evaluation of New Products The environmental aspect should be considered in each stage of the life cycle of a product beginning with its design. This practice allows a better selection of materials and processes. Pulp and Paper industry is not using LCA a lot of the assessment of new products. Nevertheless, it could be predicted that it will be more used for this purpose in the future due to the notion of product stewardship. The notion means that the manufacturer is liable for its product during the course of its entire life cycle, from the design stage through raw material extraction and on the final disposition of the product. Life Cycle Assessment
  148. 148. Survey of applications Strategic Evaluation LCA applications can go farther than the comparison of products, process benchmarking, choice of improvement alternatives, or green design. It can provide an organization with helpful information for strategic choices and marketing. A few examples of how LCA has been used to accomplish this objective are presented in the next table. Like mentioned before, LCA has only just begun to be used for strategic evaluations other than process analysis and comparison of improvement variants. Up today, the main applications in this field were the structuring of supply chains and marketing. Life Cycle Assessment
  149. 149. Survey of applications Strategic Evaluation : Structuring of Supply Chains Strategic Evaluation : Strategic Policy Development and Marketing Strategic Evaluation : LCA and EMS Life Cycle Assessment Canfor sees benefits of using LCA within the supply chain. There is an enhancement of the partner's knowledge about the potential environmental impact of the paper chain. This experience makes opportunities for improvement more obvious. Because both economic and environmental performance can be optimized, there are clear benefits from having suppliers and customers working closely and studying the process chain. Bradley (1999) Canada Application Reference International paper uses LCA in order to satisfy their customers’ concerns about the environment. Côté (1996) USA Application Reference Proposition of a transparent and stringent methodology to identify and assess environmental aspect in EMS based on LCA Zobel at al. (2002) Sweden Application Reference
  150. 150. The LCA methodologies presented in the publications were almost always incomplete. The major criticisms concern adherence to life cycle assessment stages related to the quality of the studies i.e. data quality sensitivity, completeness and coherence studies. Product comparison is the most sensitive application to LCA limitations because dealing with two products with the difference in system of product compared has a consequence that there is more subjective choice to do this application compared to the others. The most obvious application of LCA is process analysis, as it was created for this. However, the comparison of process alternatives will have more value if supported by techno-economic analysis. Survey of applications Life Cycle Assessment
  151. 151. Tier I : Contents <ul><li>Introduction and definition of the Life Cycle Assessment (LCA). • ISO 14040 guidelines. </li></ul><ul><li>Overview of 4 stages of life cycle methodology. </li></ul><ul><li>Survey of life cycle applications in the pulp and paper industry. • Types of applications. • Analysis of methodologies that have been employed, and identification of deficiencies in methodology. </li></ul><ul><li>Proposal of “life cycle thinking” concept: using LCA as a tool for practical applications in the operation of a facility. </li></ul><ul><li>Multiple choice questions </li></ul>
  152. 152. Life Cycle Thinking Life Cycle thinking implies that everyone in the whole chain of a product’s life cycle , from cradle to grave, has a responsibility and a role to play, taking into account all the relevant external effects. The impacts of all life cycle stages need to be considered comprehensively when taking informed decisions on production and consumption patterns, policies and managements strategies.
  153. 153. Module 14 Life Cycle Thinking In the UK, Professor Roland Clift argued that “it is key that life-cycle thinking be fostered throughout organizations, and be adopted as part and parcel of the organization’s philosophy, mission and day-to-day operations. This makes it essential that life-cycle thinking also be applied corporate educational processes”. Life cycle thinking is a mostly quantitative discussion to identify stages of the life cycle and/or the potential environmental impacts of greatest significance e.g. for use and design brief or in an introductory discussion of policy measures. The greatest benefit is that it helps focus consideration of the full life cycle of the product or system.
  154. 154. Applied to product design, manufacturing processes and as a decision-making tool for environmental policies, life cycle thinking is an essential element for the implementation of sustainable development. Moving toward sustainability Life Cycle Thinking
  155. 155. Sustainable Development (SD) It is defined as a development that meets the needs of the present without compromising the ability of future generations to meet their own needs. Schematic representation of the notion of sustainable development. Life Cycle Thinking
  156. 156. Industrial Ecology (IE) The journal of Industrial Ecology, defines IE as: a rapidly growing field that systematically examines local, regional, and global uses and flows of materials and energy in products, processes, industrial sectors, and economies. It focuses on the potential role of industry in reducing environmental burdens throughout the product life cycle from the extraction of raw materials to the production of goods, to the use of those goods and to the management of the resulting wastes. Life Cycle Thinking
  157. 157. Life Cycle Thinking Design for the Environment (DfE) Design for the environment approach is grounded in comparing performance, costs, and the risks associated with alternatives. It uses cleaner technologies, substitute assessments (CTSAs) and life cycle tools to evaluate the performance, cost, and environmental and human health impacts of competing technologies. A goal of DfE is to encourage pollution prevention, front-end, innovations through redesign rather than relying in end-of-pipe controls to reducing potential risks to human health and the environment.
  158. 158. Life Cycle Thinking Pollution Prevention (PP) It is the use of processes, practices, materials, products or energy sources that avoid or minimize the creation of pollutants and waste, and reduce the risk to human health and the environment.
  159. 159. Life Cycle Thinking Cleaner Production (CP) The continuous application of an integrated preventive environmental strategy applied to processes, products, and services to increase overall efficiency and reduce risks to humans and the environment. For production processes, cleaner production includes conserving raw materials and energy, eliminating toxic raw materials, and reducing the quantity and toxicity of all emissions and wastes . For products is involves reducing the negative impacts along the life cycle of a product, from raw materials extraction to its ultimate disposal. For services the strategy focuses on incorporating environmental concerns into designing and delivering services.
  160. 160. Life Cycle Thinking Life Cycle Management The basic idea in life cycle management is to establish a thorough knowledge of the environmental burdens of the products manufactured by the company and use this for improvement actions. The process includes employees at most levels of the company and starts with an identification of all processes at the production site and an analysis of the related in-and outputs. The result from the process can be used to establish an LCA, but it is more important that the results are used to minimize the environmental burdens. This one by using a set of tools tailored to meet the needs of a given company, e.g. design for the environment, pollution prevention strategies, waste audits, green procurement etc.
  161. 161. Tier I : Contents <ul><li>Introduction and definition of the Life Cycle Assessment (LCA). • ISO 14040 guidelines. </li></ul><ul><li>Overview of 4 stages of life cycle methodology. </li></ul><ul><li>Survey of life cycle applications in the pulp and paper industry. • Types of applications. • Analysis of methodologies that have been employed, and identification of deficiencies in methodology. </li></ul><ul><li>Proposal of “life cycle thinking” concept: using LCA as a tool for practical applications in the operation of a facility. </li></ul><ul><li>Multiple choice questions </li></ul>
  162. 162. Tier I : Quiz Question 1: <ul><li>What parts imply the cradle-to-grave concept? </li></ul><ul><ul><ul><ul><li>Extraction and transport of raw materials </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Production </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Consumption </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Re-use or disposal </li></ul></ul></ul></ul><ul><ul><ul><ul><li>All of the above. </li></ul></ul></ul></ul>Life Cycle Assessment
  163. 163. Tier I : Quiz Question 2: <ul><li>Which parts according SETAC conform an LCA study? </li></ul><ul><li>Life Cycle Inventory (LCI), Life Cycle Impact Assessment (LCIA), the Interpretation of the study. </li></ul><ul><li>Defining the goal and scope of the study, Life Cycle Inventory (LCI), Life Cycle Impact Assessment (LCIA), the Interpretation of the study. </li></ul><ul><li>Defining the goal and scope of the study, Life Cycle Inventory (LCI), Life Cycle Impact Assessment (LCIA). </li></ul>Life Cycle Assessment
  164. 164. Tier I : Quiz Question 3: <ul><li>Principal factors that should be considered and stated clearly in the Scope of Study include: </li></ul><ul><ul><ul><li>The function(s) of the system to be analyzed </li></ul></ul></ul><ul><ul><ul><li>The system boundaries </li></ul></ul></ul><ul><ul><ul><li>Data requirements </li></ul></ul></ul><ul><ul><ul><li>Any assumptions made </li></ul></ul></ul><ul><ul><ul><li>Study limitations </li></ul></ul></ul><ul><ul><ul><li>All of the above </li></ul></ul></ul>Life Cycle Assessment
  165. 165. Tier I : Quiz Question 4: <ul><li>What is the most sensitive to LCA’s limitations ? </li></ul><ul><ul><ul><li>Money </li></ul></ul></ul><ul><ul><ul><li>Information </li></ul></ul></ul><ul><ul><ul><li>Society </li></ul></ul></ul><ul><ul><ul><li>Product Comparison </li></ul></ul></ul><ul><ul><ul><li>Goal and Scope </li></ul></ul></ul>Life Cycle Assessment
  166. 166. Tier I : Quiz Question 5: <ul><li>It consist in the determination of the contribution of each stage to different impact categories? </li></ul><ul><ul><ul><ul><li>Process analysis and benchmarking </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Life Cycle Assessment </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Inventory Analysis </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Sustainability </li></ul></ul></ul></ul>Life Cycle Assessment
  167. 167. Tier I : Quiz Question 6: <ul><li>What implies Life Cycle thinking ? </li></ul><ul><li>Consecutive and interlinked stages of a product or service system, from the extraction of natural resources to the final disposal </li></ul><ul><li>That everyone in the whole chain of a product’s life cycle, from cradle to grave, has a responsibility and a role to play, taking into account all the relevant external effects </li></ul><ul><li>Defining a functional unit can be quite difficult, as the performance of products is not always easy to describe </li></ul>Life Cycle Assessment
  168. 168. Tier I : Quiz Question 7: <ul><li>It is defined as a development that meets the needs of the present without compromising the ability of future generations to meet their own needs: </li></ul><ul><ul><ul><ul><li>Cleaner Production </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Sustainable Development </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Industrial Ecology </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Inventory Analysis </li></ul></ul></ul></ul>Life Cycle Assessment
  169. 169. Tier I : Quiz Question 8: <ul><li>The goal and scope definition is a guide that helps you to ensure the consistency of the LCA you perform. </li></ul><ul><ul><ul><ul><ul><li>True </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>False </li></ul></ul></ul></ul></ul>Life Cycle Assessment
  170. 170. Tier I : Quiz Question 9: <ul><li>Most of the study about LCA studies come from the university sector because : </li></ul><ul><ul><ul><ul><li>They like it </li></ul></ul></ul></ul><ul><ul><ul><ul><li>It is easy </li></ul></ul></ul></ul><ul><ul><ul><ul><li>LCA methodology is still under development </li></ul></ul></ul></ul><ul><ul><ul><ul><li>It is difficult </li></ul></ul></ul></ul>Life Cycle Assessment
  171. 171. Assuming that you have done all the reading, this is the end of Tier 1 . No doubt much of this information seems confusing, but things will become more clear when we look at examples in Tier 2. Life Cycle Assessment
  172. 172. D E F I N I T I O N S T i e r III
  173. 173. Life Cycle Assessment Terminology Allocation . Material input that is used by the unit process producing the product, but does not constitute a part of the product – e.g. a catalyst. Category endpoint . Attribute or aspect of natural environment, human health or resources identifying an environmental issue of concern. Characterization . Second element within impact assessment succeeding the classification element and preceding valuation, in which analysis/quantification, and aggregation of the impacts within the chosen impact categories takes place.
  174. 174. Life Cycle Assessment Terminology Classification . First element within impact assessment, which attributes the environmental inventions listed in the inventory table to a number of selected impact categories. Completeness . Percentage of locations reporting primary data from the potential number in existence for each data category in a input process. Consistency . Qualitative assessment of how uniformly the study methodology is applied to the various components of the analysis.
  175. 175. Life Cycle Assessment Terminology Data quality . Characteristics of data that bears on their ability to satisfy stated requirements. Elementary Flow . Material or energy entering the system being studied, which has been draw from the environment without previous human transformation. Functional Unit . Quantified performance of a product system for use as a reference unit in a life cycle assessment study. Geographical coverage . Geographic area from which data for unit processes should be collected to satisfy the goal of the study (e.g. local, regional, national, continental, global).
  176. 176. Life Cycle Assessment Terminology Impact . The consequences for health, for the well-being of flora and fauna or for the future availability of natural resources, attributable to the input and output streams of a system. Impact Category . Class representing environmental issue of concern into which LCI results may be assigned. Intermediated Flow . Input or output from a unit process which requires further transformation.
  177. 177. Life Cycle Assessment Terminology Marketing . Traditional way to communicating product properties and capabilities which are consistent with the consumer’s expectations and demands. As the level of environmental consciousness is increasing, more attention is being paid by the consumer to the environmental properties of goods and services. This is being used (and misused) by many companies to attempt to increase their market share, and development of criteria and guidelines for environmental marketing has a high priority.
  178. 178. Life Cycle Assessment Terminology Normalization . An optional element within impact assessment which involves relating all impact scores of a functional unit in the impact score profile to a reference situation. Normalization results in a normalized impac

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