This study emphasizes on the removal of heavy metals in landfill leachate by using natural soil mixed with agricultural wastes. The agricultural wastes used in this study werenatural soil or known as laterite soil, pressmud which is a waste from sugar refinery process and Empty Fruit Bunch (EFB), one of many forms of waste fromoil palm industry. The laterite soil was mixed with these wastes at different percentages of weight ratio namely 50S:40P:10E, 50S:30P:20E, 50S:25P:25E, 50S:10P:40E and 50S:20P:30E. The terms S, P and E each refers to soil, pressmud and empty fruit bunch respectively.Removal efficiency tests were also carried out and the results showed that the mixtures of laterite soil have the ability to remove concentrationsof As2+, Cd2+, Cr2+, Cu2+, Fe2+, Ni2+ and Zn2+between a range of 86% (minimum) and 99% (maximum) compared to removal via soil per se. Ergo, the laterite soil-pressmud-EFB mixtures signify great potential to be made as a daily cover material that minimizes heavy metals migration in landfill leachate, eliminates odor issues and providesadditional protection from further infiltration.
After mining activities, the process of natural succession begins and plant communities which differ from the surrounding vegetation start to grow. Re-vegetation accelerate the development of soil processes in the quarries. The study of this vegetation and soil cover will help to develop ways for the remediation of man-made landscapes. The project studies an important scientific and technical issue about anthropogenic habitats, in which vegetation was completely removed.
The project won the 1st Prize in National Quarry Life Award in 2012 in Kazakhstan.
Read more: http://www.quarrylifeaward.com/project/rehabilitation-topsoil-production-induced-landscapes
Physical fractionation techniques have often relied on the breakdown of soil structure into its textural classes or density fractions in order to study SOM dynamics. This appears to be inappropriate for investigating how soil structure is maintained. The bonding agents responsible for structure have been well defined, although the effects of farming systems on them are not fully understood. Techniques which can rapidly assess the impacts of management on bonding agents and structure are required in order to develop sustainable farming systems.
An Example of Constructed Wetland Planning for a Rural Settlement in TurkeyPremier Publishers
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Artificial wetlands are one of the methods that are used to recover the water specifically for domestic use or for agricultural activities without damaging the environment. These are the combination of biological, chemical and physical treatment systems, including microorganisms, plants, animals and aquatic ecology. These systems are economical because they do not require energy, special equipment, and trained personnel to operate them. This study focuses on the planning of constructed wetlands in the existing rural settlements or in future rural settlements that need to be re-planned as a result of various factors in Turkey conditions. In this study, an artificial wetland plan sample was prepared for domestic wastewater treatment in Demirgecit Village, which has cold climatic conditions, a projection population of 350 and a height of approximately 1750 m above sea level. As a result of the planning, the wetland area consisting of two chambers of 0.7m depth, 20m width, and 40m length was determined. The BOD (Biological Oxygen Demand) value of the effluent water and holding time in the chamber were found to be 20.17 mg / L and 5.6 days respectively.
Effect of Municipal Solid Waste Leachate on the Quality of Soilinventionjournals
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Dumping of solid wastes on land is a common waste disposal method and practiced almost by all the cities around the globe. Precipitation that infiltrates through the municipal solid waste leach the constituents from the decomposed waste mass and while moving down causes the subsurface soil to be contaminated by organic and inorganic solutes. In the present study an attempt has been made to evaluate the impact of municipal solid waste leachate on the properties of soil at a landfill site at kengeri and BBMP Nayandahalli solid waste disposal site Bengaluru city. Also soil samples were collected from one trial pits, located just around the dump site to serve as control (uncontaminated) soil sample at global village. Soil profile pits were excavated non disposal of solid waste site and solid waste disposal site. Results were compared for the physicochemical properties of soil. The results show that the values of the natural moisture content of the uncontaminated soil generally lower compared to those of the contaminated soil samples..The chloride concentration in contaminated soil is 108.46 mg/l, it indicates that it is higher than uncontaminated soil which is 40mg/l. This indicates that due to disposal of solid waste the quality of the soil is reduced. Lastly the study conclude based on the results obtained, the disposal solid waste, soil quality is gets reduced compared to uncontaminated soil.
After mining activities, the process of natural succession begins and plant communities which differ from the surrounding vegetation start to grow. Re-vegetation accelerate the development of soil processes in the quarries. The study of this vegetation and soil cover will help to develop ways for the remediation of man-made landscapes. The project studies an important scientific and technical issue about anthropogenic habitats, in which vegetation was completely removed.
The project won the 1st Prize in National Quarry Life Award in 2012 in Kazakhstan.
Read more: http://www.quarrylifeaward.com/project/rehabilitation-topsoil-production-induced-landscapes
Physical fractionation techniques have often relied on the breakdown of soil structure into its textural classes or density fractions in order to study SOM dynamics. This appears to be inappropriate for investigating how soil structure is maintained. The bonding agents responsible for structure have been well defined, although the effects of farming systems on them are not fully understood. Techniques which can rapidly assess the impacts of management on bonding agents and structure are required in order to develop sustainable farming systems.
An Example of Constructed Wetland Planning for a Rural Settlement in TurkeyPremier Publishers
Â
Artificial wetlands are one of the methods that are used to recover the water specifically for domestic use or for agricultural activities without damaging the environment. These are the combination of biological, chemical and physical treatment systems, including microorganisms, plants, animals and aquatic ecology. These systems are economical because they do not require energy, special equipment, and trained personnel to operate them. This study focuses on the planning of constructed wetlands in the existing rural settlements or in future rural settlements that need to be re-planned as a result of various factors in Turkey conditions. In this study, an artificial wetland plan sample was prepared for domestic wastewater treatment in Demirgecit Village, which has cold climatic conditions, a projection population of 350 and a height of approximately 1750 m above sea level. As a result of the planning, the wetland area consisting of two chambers of 0.7m depth, 20m width, and 40m length was determined. The BOD (Biological Oxygen Demand) value of the effluent water and holding time in the chamber were found to be 20.17 mg / L and 5.6 days respectively.
Effect of Municipal Solid Waste Leachate on the Quality of Soilinventionjournals
Â
Dumping of solid wastes on land is a common waste disposal method and practiced almost by all the cities around the globe. Precipitation that infiltrates through the municipal solid waste leach the constituents from the decomposed waste mass and while moving down causes the subsurface soil to be contaminated by organic and inorganic solutes. In the present study an attempt has been made to evaluate the impact of municipal solid waste leachate on the properties of soil at a landfill site at kengeri and BBMP Nayandahalli solid waste disposal site Bengaluru city. Also soil samples were collected from one trial pits, located just around the dump site to serve as control (uncontaminated) soil sample at global village. Soil profile pits were excavated non disposal of solid waste site and solid waste disposal site. Results were compared for the physicochemical properties of soil. The results show that the values of the natural moisture content of the uncontaminated soil generally lower compared to those of the contaminated soil samples..The chloride concentration in contaminated soil is 108.46 mg/l, it indicates that it is higher than uncontaminated soil which is 40mg/l. This indicates that due to disposal of solid waste the quality of the soil is reduced. Lastly the study conclude based on the results obtained, the disposal solid waste, soil quality is gets reduced compared to uncontaminated soil.
Soil Remediation Technologies for Heavy Metals â A ReviewDr. Amarjeet Singh
Â
Soil is a very vital necessity to the ecosystem and
human population. Due to the urbanization and
industrialization, the quality and the fertility of soil is
deteriorating. This has been a huge concern among countries
to discover the suitable yet effective solution to remediate the
soil as the contaminated soil may introduce unhealthy and
unsafe environment to society. One of the common pollutants
in soils are heavy metals and it is very challenging to
remediate as it is not biodegradable materials. Remediation
methods for metals can be classified to two categories; in-situ
remediation and ex-situ remediation. Studies show that
chemical remediation the most effective methods used.
Chemical remediation and biological remediation are also
another two available options. Chemical remediation
methods can be categorized into four; chemical leaching,
chemical fixation, electrokinetic remediation and vitrify
technology. Biological remediation includes
phytoremediation, bioremediation and the combination of the
remediation are one of the most cost effective methods that
can be implemented especially in poor and middle income
countries as it involves natures such as plants and animals in
the process.
effect of mining activities on vegetation composition and nutrient status of ...IJEAB
Â
Mining is essential in the economic development plan of any country endowed with mineral resources. This is due to both internal and external economic benefits that are made available to countries that are involved in the extraction of mineral resources. Internally, there is creation of employment and revenue generation among others while externally; a substantial foreign exchange is available to such countries. However, looking at the socio-economic importance of the industry, most countries lose sight of the ensuing effect that might accrue to an area as a result of mining activities. This study sought to provide an empirical data to ascertain whether or not mining activities has affected tree diversity of the area in general and on vegetation and soil nutrients in particular. In the study diversity indices (Shannon, margalef and Pielouâs evenness) all indicated higher values for adjacent site 5 km away from the factory. Soil health indicators investigated revealed significant differences except Potassium, with adjacent site having higher mean values. This study has indicated that tree diversity was higher in the adjacent site and also that soil 5 km away from the factory was healthier than soil within factory site. Construction of shield over factory site is suggested.
URL: http://www.ejolt.org/2014/08/building-an-economy-on-quicksand/
'..Until recently sand was extracted in land quarries and riverbeds; however, these inland resources have nearly been depleted so that extraction has shifted to marine and coastal aggregates mining.'
Sand from deserts cannot be used for most purposes, as wind erosion over time forms round grains that do not bind well [4]. For most industrial uses, edged sand grains with a rough surface are needed, which stick together naturally. Desert sands, however, are usually fine- grained and of low shear strength âit does not even suit as material for the creation of artificial islands. Dubai, for example, used up all its suitable marine sand supplies for an artificial set of sand islands and, after these were exhausted, now has to import sand from Australia for continuing its building madness.
Most of the sand is by now extracted from the ocean floor â globally thousands of large boats are sucking up huge quantities of sand from the ocean floor in coastal areas like vacuum cleaners. As a result of currents, gravitation and movements of the waves, the gaps which were created by sand extraction are then filled by sand sliding in from surrounding areas and beaches. Due to this vicious cycle in Miami each year beaches have to be replenished with dredged-up sand to further provide tourists with its famous beaches.
In some extreme cases, the mining of marine aggregates has even changed international boundaries, such as through the disappearance of entire islands in Indonesia â since 2005 at least 24 small islands have disappeared as a result of erosion caused by illegal sand mining. Most of this sand is going to Singapore, which has expanded its surface area by 22% since the 1960s [5]. In response to this potentially heavy environmental toll many neighboring countries (Indonesia, Malaysia and Vietnam) have now banned exports of sand to Singapore, but this has only shifted the problem to countries such as Cambodia.
The conflicts caused by sand mining were for the first time brought to the attention of the general public through the documentary Sand Wars. Among many other outreach victories, the documentary inspired the United Nations Environment Programme (UNEP) to publish a Global Environmental Alert in March 2014 titled âSand, rarer than one thinksâ. In it, the authors state that âFormed by erosive processes over thousands of years, they [sand and gravel] are now being extracted at a rate far greater than their renewalâ.
The analysis of the roadâs ecological environment and case studyIJERA Editor
Â
The mileages of both urban roads and highways are in the process of rising. Therefore, the problems about
roadâs ecological environment have been put out. This paper, analysing some basic ecological environmental
problems in G Road, District Fang Cheng Gang , Guangxi Province, pointed out that the roads and highways are
the products during the development of economy and society, which need to be balanced by factors like natural
eco-environment and social eco-environment. At the same time, different questions occur in construction and
running phase should be focused and tackled.
Determination of the Soil Organic Carbon (SOC) and Measurement of the Biodive...Shariful Islam
Â
Soil organic carbon is one of the important elements and the major component of the soil. A complex biogeochemical cycle in the soil mostly dependent on the soil organic carbon (SOC). However, this experimental method measure the soil organic carbon in the Chandpai range, Sundarbans. The research has been found the soil organic carbon at very low portion in the study area and the different diversity index of different study plots of the forest. The sampling area contaminated with oil spill and affected by different human activities. Most of the studied focused on the different parameters of the forest soil such as soil pH, soil water holdings capacity, soil moisture etc. However, this study analyzes the soil to measure the soil organic carbon and calculate the biodiversity index in the Sundarbans
Urban India generates 188,500 tons per day (68.8 million tons per year) of municipal solid waste (MSW) at a per capita waste generation rate of 500 grams/person/day. I mproper solid waste management deteriorates public health,degrades quality of life,and pollutes local air,water and land resources. It also causes global warming and climate change and impacts the entire planet. Im proper waste management is also identified as a cause of 22 human diseases and results in numerous premature deat hs every year. The composition of urban MSW in India is 51% organics,17.5% recyclables (paper,pla stic,metal,and glass) and 31 % of inerts. The moisture content of urban MSW is 47% and the average calorific value is 7.3 MJ/kg (1745 kcal/kg). The composition of MSW in the North,East,South and Western regions of the country varied between 50-57% of organics,16-19% of recyclables,28-31% of inerts and 45-51% of moistur e. The calorific value of the waste varied between 6.8-9.8 MJ/kg (1,620-2,340 kcal/kg). Currently,there is no system or mechanism exists to dry the municipal solid waste. In this research work such syst em can be designed and developed which will dry the municipal solid waste and remove the odor from it. Dried municipal solid waste can be further used as fuel for boiler.
Soil Remediation Technologies for Heavy Metals â A ReviewDr. Amarjeet Singh
Â
Soil is a very vital necessity to the ecosystem and
human population. Due to the urbanization and
industrialization, the quality and the fertility of soil is
deteriorating. This has been a huge concern among countries
to discover the suitable yet effective solution to remediate the
soil as the contaminated soil may introduce unhealthy and
unsafe environment to society. One of the common pollutants
in soils are heavy metals and it is very challenging to
remediate as it is not biodegradable materials. Remediation
methods for metals can be classified to two categories; in-situ
remediation and ex-situ remediation. Studies show that
chemical remediation the most effective methods used.
Chemical remediation and biological remediation are also
another two available options. Chemical remediation
methods can be categorized into four; chemical leaching,
chemical fixation, electrokinetic remediation and vitrify
technology. Biological remediation includes
phytoremediation, bioremediation and the combination of the
remediation are one of the most cost effective methods that
can be implemented especially in poor and middle income
countries as it involves natures such as plants and animals in
the process.
effect of mining activities on vegetation composition and nutrient status of ...IJEAB
Â
Mining is essential in the economic development plan of any country endowed with mineral resources. This is due to both internal and external economic benefits that are made available to countries that are involved in the extraction of mineral resources. Internally, there is creation of employment and revenue generation among others while externally; a substantial foreign exchange is available to such countries. However, looking at the socio-economic importance of the industry, most countries lose sight of the ensuing effect that might accrue to an area as a result of mining activities. This study sought to provide an empirical data to ascertain whether or not mining activities has affected tree diversity of the area in general and on vegetation and soil nutrients in particular. In the study diversity indices (Shannon, margalef and Pielouâs evenness) all indicated higher values for adjacent site 5 km away from the factory. Soil health indicators investigated revealed significant differences except Potassium, with adjacent site having higher mean values. This study has indicated that tree diversity was higher in the adjacent site and also that soil 5 km away from the factory was healthier than soil within factory site. Construction of shield over factory site is suggested.
URL: http://www.ejolt.org/2014/08/building-an-economy-on-quicksand/
'..Until recently sand was extracted in land quarries and riverbeds; however, these inland resources have nearly been depleted so that extraction has shifted to marine and coastal aggregates mining.'
Sand from deserts cannot be used for most purposes, as wind erosion over time forms round grains that do not bind well [4]. For most industrial uses, edged sand grains with a rough surface are needed, which stick together naturally. Desert sands, however, are usually fine- grained and of low shear strength âit does not even suit as material for the creation of artificial islands. Dubai, for example, used up all its suitable marine sand supplies for an artificial set of sand islands and, after these were exhausted, now has to import sand from Australia for continuing its building madness.
Most of the sand is by now extracted from the ocean floor â globally thousands of large boats are sucking up huge quantities of sand from the ocean floor in coastal areas like vacuum cleaners. As a result of currents, gravitation and movements of the waves, the gaps which were created by sand extraction are then filled by sand sliding in from surrounding areas and beaches. Due to this vicious cycle in Miami each year beaches have to be replenished with dredged-up sand to further provide tourists with its famous beaches.
In some extreme cases, the mining of marine aggregates has even changed international boundaries, such as through the disappearance of entire islands in Indonesia â since 2005 at least 24 small islands have disappeared as a result of erosion caused by illegal sand mining. Most of this sand is going to Singapore, which has expanded its surface area by 22% since the 1960s [5]. In response to this potentially heavy environmental toll many neighboring countries (Indonesia, Malaysia and Vietnam) have now banned exports of sand to Singapore, but this has only shifted the problem to countries such as Cambodia.
The conflicts caused by sand mining were for the first time brought to the attention of the general public through the documentary Sand Wars. Among many other outreach victories, the documentary inspired the United Nations Environment Programme (UNEP) to publish a Global Environmental Alert in March 2014 titled âSand, rarer than one thinksâ. In it, the authors state that âFormed by erosive processes over thousands of years, they [sand and gravel] are now being extracted at a rate far greater than their renewalâ.
The analysis of the roadâs ecological environment and case studyIJERA Editor
Â
The mileages of both urban roads and highways are in the process of rising. Therefore, the problems about
roadâs ecological environment have been put out. This paper, analysing some basic ecological environmental
problems in G Road, District Fang Cheng Gang , Guangxi Province, pointed out that the roads and highways are
the products during the development of economy and society, which need to be balanced by factors like natural
eco-environment and social eco-environment. At the same time, different questions occur in construction and
running phase should be focused and tackled.
Determination of the Soil Organic Carbon (SOC) and Measurement of the Biodive...Shariful Islam
Â
Soil organic carbon is one of the important elements and the major component of the soil. A complex biogeochemical cycle in the soil mostly dependent on the soil organic carbon (SOC). However, this experimental method measure the soil organic carbon in the Chandpai range, Sundarbans. The research has been found the soil organic carbon at very low portion in the study area and the different diversity index of different study plots of the forest. The sampling area contaminated with oil spill and affected by different human activities. Most of the studied focused on the different parameters of the forest soil such as soil pH, soil water holdings capacity, soil moisture etc. However, this study analyzes the soil to measure the soil organic carbon and calculate the biodiversity index in the Sundarbans
Urban India generates 188,500 tons per day (68.8 million tons per year) of municipal solid waste (MSW) at a per capita waste generation rate of 500 grams/person/day. I mproper solid waste management deteriorates public health,degrades quality of life,and pollutes local air,water and land resources. It also causes global warming and climate change and impacts the entire planet. Im proper waste management is also identified as a cause of 22 human diseases and results in numerous premature deat hs every year. The composition of urban MSW in India is 51% organics,17.5% recyclables (paper,pla stic,metal,and glass) and 31 % of inerts. The moisture content of urban MSW is 47% and the average calorific value is 7.3 MJ/kg (1745 kcal/kg). The composition of MSW in the North,East,South and Western regions of the country varied between 50-57% of organics,16-19% of recyclables,28-31% of inerts and 45-51% of moistur e. The calorific value of the waste varied between 6.8-9.8 MJ/kg (1,620-2,340 kcal/kg). Currently,there is no system or mechanism exists to dry the municipal solid waste. In this research work such syst em can be designed and developed which will dry the municipal solid waste and remove the odor from it. Dried municipal solid waste can be further used as fuel for boiler.
Bagasse ash as a partial replacement to cement. This replacement can improve the properties of cement as well as, it reduces the effects over the environment.
Paper 3 using mixture of grit and mature compost as bulking agent- 15 jan 2012Helalley Helalley
Â
Co-composting of primary sewage sludge with matured compost, together with grit and sand
was carried out to solve the problem of grit and sand disposal, this technique improved the
sludge composting efficiency and the final compost quality
DESIGN A LEACHATE COLLECTION SYSTEM FOR A SMALL CAMP SANITARY LANDFILLIAEME Publication
Â
Sanitary landfill is still the most cost-effective and appropriate method for waste disposal in Iraq. The municipal solid waste has high moisture content of about 49.1% and density of 162.6 kg/m3. The organic fraction reaches about 79%. Based on the studies and reports of study area, the average waste generation rate was 0.45 kg/capita/day. The design of the base liner, leachate collection system, and final cover system for the study area landfill is described in this paper. Since the landfill is located in an arid environment, leachate generation is low and potential infiltration through the lining system is minimal. A 250 mm diameter drainage pipes have longitudinal slope 1% to reduce sedimentation and allow adequate flow capacity.
The topic caters to information needs of waste disposal and landfill. The universal generation of waste has negative consequences on human activities. The study enables understanding of different types of waste and their consequences on human health and environment. . The main purpose of this study is to detail the risk of waste disposal for groundwater quality and entails the information required for assessment of risks. The initial section details about classification of waste and then after, explains storage, treatment and disposal of waste. It has also covered the factors governing contamination of groundwater by disposal of waste for understanding the major concerns of waste composition, leachate production and migration. The final section of study includes assessment of groundwater contamination related to waste sites. The increasing proportion of waste has to control in future and therefore, it is important to study significant aspects of waste disposal and landfill.
Qualitative Study of Landfill Leachate from Different Ages of Landfill Sites ...iosrjce
Â
The present paper describes the qualitative analysis of landfill leachate at different ages of landfill
sites (LFS) around the world and it has been prepared on the basis of extensive survey of literatures. The main
objective of this study was to explore the knowledge on qualitative analysis of municipal solid waste landfill
leachate. This paper provides a reliable and robust database for the prediction of leachate quality when new
landfills are to be developed in Nepal and other parts of the world.
Large amount of biodegradable organic matter is indicated though high ratio of BOD/COD. This in turn leads
to relative high concentration of Fe, Mn, Ni and Zn. The lower concentration of VFAs and high pH represents
âoldâ leachate from the late methanogenic phase. The humic substances give a dark color to stabilized
leachate. Due to the decreasing solubility of many metal ions with increasing pH, the concentration of metal
ions is low in general. The strength of the leachate decreases with time with precipitation of soluble elements
such as heavy metals as the organic compounds break down biologically. This is the reason why leachate
management is problematic due to complexity in its design, operation, and composition, age of landfill, specific
climate conditions and moisture routing through the landfill. In order to avoid pollution and toxicity level in the
water bodies, it is legal necessity to treat landfill leachate before discharging it
Soil erosion which is now one of the impacts of climate change due to increased precipitation events across the globe needs adaptations for adjusting to the actual and expected change in its occurrence more than mechanical/engineering measures for the management of the phenomenon. The objective of this paper is to conduct an in-depth review of adaptation strategies to soil erosion. The research made a review of academic/journal articles, internet materials, news articles, conference papers, books and publicly available materials on adaptations to soil erosion. From the review, most authors have a unity of opinion on adaptive strategies to soil erosion, including the use of mulching, cover cropping, reduced tillage, contour bonds, tree planting, wood logs and ploughing across the slope as they have been found to increase soil yield and reduce soil loss as well as its accompanying adverse impacts. Recommendations of the study includes: (1) enhancement of the existing adaptive measures; (2) a shift from rain-fed agriculture to dry season farming; (3) training the affected people on adopting the adaptive measures which are currently ignored in most communities; and (4) encouragement of the participation of land holders through grants in soil erosion management based on the adaptive techniques.
The major challenge in municipal solid waste management using landfills is
leachate, which causes a significant threat to subsurface resources. Leachate is the
liquid that passes through soil and has extracted dissolved and suspended solids from
it. Municipal solid waste landfills are one of the severe environmental impacts on the
urban environment. Landfills are one of the practices of disposal of municipal solid
waste in the Indian scenario. Understanding the leachate composition is an equally
important and critical factor in terms of environmental production. When the
municipal solid waste is buried in a landfill, physical, chemical and biological
reactions occur, and the refuse reacts with the moisture present in the soil. Studying
leachate characteristics and its treatment is essential as it could threaten the
ecosystem. Rapid urbanization is one of the major contributions to the generation of
municipal solid waste. The present study reviews the different applications available
to treat the leachate generated from municipal solid waste landfills. Nano-particles
are recently gaining great interest in the protection of the environment, which will
ensure sustainable development.
Influence of industrial wastewater on the geotechnical and physicochemical pr...IJAEMSJORNAL
Â
Fine-grained soil contamination is a daily occurrence due to industrial development and pipeline or reservoir leaks. The modification of the geotechnical properties of the polluted soil is a worry in addition to environmental issues like groundwater pollution. Recent studies have carefully examined the characteristics of contaminated fine-grained soils because it has been demonstrated that contamination modifies the geotechnical properties of soil. However, a thorough evaluation of the impact of industrial wastewater from paper (PW) and leather (LW) wastewater on the geotechnical characteristics of fine-grained soils is still lacking. As a result, thorough experimental studies have been carried out on both uncontaminated and contaminated fine-grained soils that include various concentrations of PW and LW. The soil samples were extracted from the lands in Benha City, Cairo, Egypt, which were exposed to PW and LW at 2, 4, 6, 8, 12, and 16 months. The findings showed that as soil ages, there is a decrease in the maximum dry density and Atterberg limits of the soil containing PW, as well as a increase in the optimum moisture content (OMC) and cohesive. On the other hand, the findings also showed that there is a decline in maximum dry density and Atterberg limits as well as a rise in OMC and cohesive. Additionally, ageing caused a further decrease in cohesion and increased the free swelling values in the case of the soil coated with PW, while decreasing the leather wastewater exposure. Finally, the microscopic investigations and mineralogical analysis confirmed the trend of the experimental results on the mechanical properties of the contaminated soils.
Monitoring of Selected Heavy Metals Uptake by Plant around Fagbohun Dumpsite,...iosrjce
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IOSR Journal of Environmental Science, Toxicology and Food Technology (IOSR-JESTFT) multidisciplinary peer-reviewed Journal with reputable academics and experts as board member. IOSR-JESTFT is designed for the prompt publication of peer-reviewed articles in all areas of subject. The journal articles will be accessed freely online
Identification Of Soil Erosion Prone Zones Using Geomatics Technology In Part...IJERA Editor
Â
Soil erosion is the removal and subsequent loss of soil by the action of water, ice, wind and gravity. Soil erosion is a process that occurs naturally at a slow rate. The average natural geologic rate of soil erosion is approximately 0.2 tons per acre per year. Erosion is the process were by the earth or rock is loosened or dissolved and removed from any part of earthâs surface. Geological erosion is the rate at which the catchment or land would normally be eroded without any disturbance by human activity. If man alters the natural system by means of various land use practices that is caused accelerated erosion. The present study area is covering Parts of North Arcot The area is lies between E78°30'-E78°45' lattitudes N12°15'-N12°30â. The total aerial extent of the study area is 720 sq.km. It falls in the survey of India Toposheet 58 L11 on 1:50,000 scale. The IRS â 1D satellite imagery data were subjected to different types of image enhancement techniques and soil erosion areas were mapped out and GIS databases were generated showing the soil erosion areas using Arc Map 9.1 version. GIS overlay function was executed between soil erosion prone areas and the various controlling variables and the area has been fragmented into a number of polygons of land segments depending upon the controlling variables. Finally, the remedial measures were suggested for each land segment according to the controlling variables.
Fate of cadmium, copper, lead and zinc on soils after the application of dif...Silvana Torri
Â
Como citar este trabajo
Torri S, Lavado R. 2009. Fate of cadmium, copper, lead and zinc on soils after the application of different treated sewage sludge in soils of the Pampas region. In: Sewage Treatment: Uses, Processes and Impact. Editors: Anna Stephens and Mark Fuller, Nova Science Publishers, Inc., Hauppauge, NY 11788. ISBN: 978-1-60692-959-9. 95-123. 394p.
La ConvenciĂłn de las Naciones Unidas de Lucha contra la DesertificaciĂłn acaba de publicar un informe en el que se señala la importancia de carbono orgĂĄnico de los suelos orientado a los decisores polĂticos y que se presentarĂĄ en la prĂłxima reuniĂłn de la UNFCCC sobre cambio climĂĄtico que se celebrarĂĄ en ParĂs (COP21).
Dust emission has become a major cause of
environmental pollution which has many adverse effects on living
beings and non-living things. Construction industry revolution
and development of Southern Pune has led to an increase in the
demand of building materials manifold. The process of quarrying
for extraction of building materials is responsible for heavy air
pollution. Blasting, handling and transportation of aggregates
emits large quantity of dust particles within Katraj region. Dry
weather condition and high speed wind spreads the dust which
increases the environmental risk. The objective to study the
analysis of impact of dust pollution on environment within the
Katraj region is to assess the potential risks in quantitative and
qualitative manner. The core knowledge of dust concentration,
behavior and complex properties of particulate matter helps to
formulate the methods and policies to exert control on their
emission and distribution.
The natural as well as artificial lakes, the source of ground
water in Southern region of Katraj, are subjected to the
deposition of heavy suspended particulate matter. Through
experimentation, it has been observed that the deposition of such
dust matter in the local atmosphere has led to significant changes
in the physical, chemical and biological parameters relating to
natural resources as it reflects in the alarming deviation of these
parameters from standard values. The present study will create
awareness and save the environment of Katraj from impending
consequences of dust particle emission
Similar to enhancement of landfill daily cover in minimizing the migration of heavy (20)
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Â
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
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This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Student information management system project report ii.pdfKamal Acharya
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Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologistâs survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
enhancement of landfill daily cover in minimizing the migration of heavy
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Enhancement of Landfill Daily Cover in
Minimizing the Migration of Heavy Metals in
Landfill Leachate by Using Natural Soil,
Pressmud& Empty Fruit Bunch (EFB) in
PulauBurung Landfill
Maheera Mohamad1
, Ismail Abustan*1
, Kamarudin Samuding2
, Amirah Mohamad1
,
Nabilah Mohamad1
1
Environmental Engineering Division, School of Civil Engineering, Engineering Campus, Universiti Sains Malaysia, 14300
Nibong Tebal, Penang, Malaysia.
2
Malaysian Nuclear Agency, 43000 Kajang, Bangi, Selangor, Malaysia.
Abstractâ This study emphasizes on the removal of
heavy metals in landfill leachate by using natural soil
mixed with agricultural wastes. The agricultural wastes
used in this study werenatural soil or known as laterite
soil, pressmud which is a waste from sugar refinery
process and Empty Fruit Bunch (EFB), one of many
forms of waste fromoil palm industry. The laterite soil
was mixed with these wastes at different percentages of
weight ratio namely 50S:40P:10E, 50S:30P:20E,
50S:25P:25E, 50S:10P:40E and 50S:20P:30E. The terms
S, P and E each refers to soil, pressmud and empty fruit
bunch respectively.Removal efficiency tests were also
carried out and the results showed that the mixtures of
laterite soil have the ability to remove concentrationsof
As2+
, Cd2+
, Cr2+
, Cu2+
, Fe2+
, Ni2+
and Zn2+
between a
range of 86% (minimum) and 99% (maximum) compared
to removal via soil per se. Ergo, the laterite soil-
pressmud-EFB mixtures signify great potential to be
made as a daily cover material that minimizes heavy
metals migration in landfill leachate, eliminates odor
issues and providesadditional protection from further
infiltration.
Keywordsâ Heavy metals, leachate, soil, pressmud,
EFB, agricultural wastes and daily cover.
I. INTRODUCTION
Municipal solid waste (MSW) is a category of diverse
waste, generated from different sources like residential,
commercial, municipal services and agriculture; each of
which is itself heterogeneous. Due to the environmental
impacts associated with MSW, there are signficant
concerns on the ever-growing volume, the commingled
nature of the wastes as well as the suitable disposal
methods to be employed in the long run (Sharifah and
Latifah, 2013).Malaysia is one of the South East
Asiancountries where landfill is important yet, despite
being used for a very long time, there is a dire need to
improve the local waste managementstandards. The
country comprises of thirteen states and three federal
territories, with a total surface area of 329,700 km2
.
However, most landfills at present are still bereft of
proper design in accordance with the sanitary landfill
scheme. The main concern on landfill operation is the
uncontrolled leachate production that can migrate to
natural waterbodies when there is inadequate barrier
between the landfill and the environment. All landfills
produce leachate by a process known as âleachingâ
whereby rainwater percolates through the permeable
waste heap. Therefore, streams and other forms of water
bodies are at risk of contamination due to the migration of
leachate (Jaffaret al.,2009), especially if the landfill is not
designed properly as to avoid environmental threats.
There are many parameters to be considered when
selecting the befitting waste disposal method such as
composition of the waste, availability and suitability of
the site, public awareness and environmental impact.
Generally, the disposal method should follow strict
regulations formulated by responsible agencies. The
method should be environmental-friendly, economical,
poses no effect on public health and availability for
maximum recycling option. Despite the complexity of
waste produced, the standards of landfills in most
developing countries are still poor; these include
inadequate waste treatment facilities, inefficient
collection and storage systems, co-disposal of municipal
waste with hazardous waste, inefficient utilisation of
disposal space, lack of environmental abatement measures
and poor documentation. As a consequence, a great deal
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of contamination, especially to surface water, soil and
ground water will in turn threaten the health of exposed
populations and ecosystems (Zhang et al., 2010).
Amongst solid waste disposal ways that can be used are
open dump, sanitary landfill, incineration, composting,
grinding and discharge to sewer, compaction, hog
feeding, milling, reduction, and anaerobic digestion.
Sanitary landfilling is currently the most common
municipal solid waste disposal method in many countries
due to its relatively simple procedure and low cost
(Norma et al., 2012; Jumaah et al., 2015). After
landfilling, solid waste undergoes physico-chemical and
biological changes. Consequently, the degradation of the
organic fraction of the wastes in combination with
percolating rainwater leads to the production of a dark
colored, highly polluted liquid called âleachateâ. The
sanitary landfill must bedesigned to isolate the wastes
from the environment until it is rendered safe through
biological, chemical and physical decaying processes.
Basically, a sanitary landfill is determined by the
following criteria: site selection and capacity are based on
environmental risk assessment; extensive site preparation;
leachate and gas management; daily and final cover;
compaction; fencing; record keeping of waste volume,
type, and source; and no waste picking and trading. One
of the paramount components of isolation is by
introducing alternative daily soil cover in order to
minimize the migration of heavy metals in landfill
leachate. Numerous methods can be used to attain
isolation of leachate from surrounding environment but it
all boils down to oneâs resources availability. The daily
cover plays an integral part in leachate production control.
Its basic functions are to limit infiltration by intercepting
precipitation directly, thereby improving evaporation
from the surface, and to reduce percolation through the
cover material by taking up soil moisture and transpiring
it back to the atmosphere. A site with a poor daily cover
may also experience erosion which cuts gullies through
the cover soil, allowing precipitation to flow directly into
the landfilled waste (Technical Guidelines for Disposal to
Land, 2016).
An engineered sanitary landfill can be known through
three common elements: 1) compaction of the wastes, 2)
daily covering (with soil or other material) to eliminate
them from outside influence, 3) control the negative
impacts on public health and environment (UNEP, 2005).
Figure 1 shows the application of daily cover in landfill
site.Three types of cover system usually applied in the
construction of a sanitary landfill are daily, intermediate,
and final cover. Daily soil cover serves an important
function to occupy more or less during the active phase of
the continuously filling operation. Itprevents vectors,
litter, odours, fire, and moisture. Besides that, the main
function of daily soil cover is to enhance the infiltration
process by reducing the amount of leachate in landfill.
Soil material that has stability such as clays, gravels, etc.
may as well be usedto improve the stabilization of landfill
soil (Bagchi, 2004).
Fig.1: Daily cover in Pulau Burung Landfill
Most landfills in Malaysia useonly laterite soil as a daily
cover in their operations. In particular, when there is a
heavy rainfall, the soil may not be an ideal cover material
as it does not reduceinfiltration process. Laterite soils are
residual soils, affluent in regions with tropical climate.
The soils are formed through leaching of lighter minerals
like silica and subsequently gets enriched withheavier
minerals such as iron and aluminium oxides. It is reported
that the degree of laterization can be estimated by
knowing the silica-sesquioxide ratio (Makasa, 2004).The
chemical properties of laterite are generally based on the
iron and alumina content within the soil giving it a
reddish look that is rich in iron oxide, derived from rock
weathering under strongly oxidizing and leaching
conditions (Akeem et al., 2012). Natural laterite and clay
soils are the most commonly compacted soil made as
daily cover in sanitary landfills. However, their suitability
is dependent on several factors, but most importantly on
the distribution of grains, type of clay mineral present and
permeability characteristics.
Pressmud is a rejected waste material coming from
sugarcane industries or classified as residue of the
filtration of sugarcane juice. Build up of such waste
exacerbated with untreated discharge into the immediate
waterbodies surrounding the sugar mills can strain the
aquatic ecosystem(Bhosale et al., 2012). Besides that, the
sugarcane industry generates several other co-products of
immense potential values including press mud (filter
cake), molasses and spent wash. The pressmud is
produced during clarification of sugarcane juice in which
about 3.5 - 4% fromcrushed sugarcane ends up as press
mud (i.e. 36-40 kg of pressmud is obtained after 1 ton of
sugarcane crushing).Pressmud is a very soft, spongy,
amorphous and dark brown material containing sugar,
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fiber and coagulated colloids including soil particles. It
consists of 80% water and 0.9-1.5% sugar, organic
matter, nitrogen, phosphorus, potassium, calcium,
sulphur, coagulated colloids and other materials in
varying amounts. Back then, when the cost of chemical
fertilizer skyrocketed and appealed unaffordable by many
farmers, pressmud was a promising source of plant
nutrient to be made as a medium for raising sugarcane
seedlings and leguminous inoculants (Yadav, 1992).When
used in combination with natural soil, pressmud, like
other organic materials can affect the physical, chemical
and biological properties of soil (Lamberton and Redcliff,
1960). Plus, due to its bulky nature and high wax content,
it is deemed problematic especially if it is directly applied
to soil as manure. The wax content might deteriorate the
soil physical properties such as permeability, aeration,
soil structure and composition etc. and with the passage
of time, the deterioration can be worsened (Bhosale et al.,
2012). Therefore, by using pressmud as an admixture in
soil, it will enhance the capability as organic manure.In a
study conducted by Nitin and Sanjiv (2012), sugarcane
wastes (especially pressmud and bagasse) were mixed
with jeevamrutham (effective microbial suspension) and
let to partially decompose. Following the decomposition,
the mixtureturned out being an excellent, palatable raw
material for vermicomposting using Eisenia fetida earth
worm.On the other hand, Harlina et al., (2016) evaluated
the effect of combining pressmud and rice husk in the
removal efficiencies of heavy metals in acidic synthetic
wastewater. The ratios of pressmud to rice husk were
varied at different percentages of weight ratio (0%, 20%,
40%, 60% 80% and 100%) and observation was made on
the resultant removal of heavy metals concentrations. The
result showed that the removal efficiency increased with
the addition of pressmud up to 100%. By using only
pressmud,almost 95% to 100% of heavy metals removal
can be achieved whereas the use of rice husk alone
managed to remove merely 10% to 20% of heavy metals.
The study also demonstrated that pressmud behaved as a
natural acid neutralizer. The presence of pressmud in a
synthetic acidic wastewater had increased its initial pH
which was originally below 2(acidic) to a range between
6 to 8 (more alkaline).
Empty fruit bunches (EFB) refer to the remaining solid
residues obtained after the fruit bunches are pressed at oil
mills and the oil gets extracted. The amountof EFB
producedkeeps rising from year to year because of the
expansion of mature planted area, favorable weather
conditions and rainfall distribution as well as constant
sunshine throughout the year. However, the large
quantities of unused EFB that are produced by palm oil
mill industries give serious problem for the country.
Given its large stock of lignocellulose material that is
contained therein, it would be a waste to keep it
underutilized. With high cellulosic fiber content and the
fact that it is an abundant agricultural waste in Malaysia
(Wan Nik et al., 2006; Rahman et al., 2006), EFB is now
being utilizedas an absorbent material in removing heavy
metals from wastewater and landfill leachate. At present,
many researchers are soliciting to transform EFB into a
more valuable substrate or product as a solution to the
problem that it brings (Faradilla, 2006).Kamarudin (2010)
used EFB mixed with local soil to minimize the migration
of contaminants in Taiping Landfill and he concluded that
the degree of heavy metals removal varies from 65.3% to
94.4%.There is also another study onthe use EFB and its
potential application as a fiber filter media to remove oil
and grease, turbidity and organics in terms of Biological
Oxygen Demand (BOD) and Chemical Oxygen Demand
(COD) from palm oil mill effluent treatment process. Oil
palm empty fruit bunch (OPEFB) fibers were modified
with chitosan solution before processed into a mat-type
filter medium. From the microscopic images, changes in
the surface morphology of the fibers could be observed
due to the chemical treatment. Meanwhile, the bench-
scaledexperiment results indicate that pre-treatment using
the fiber filtration system was able to remove upto 66% of
turbidity, 67% of Total Suspended Solid (TSS) and 85%
of oil and grease. This marks a great potentialfor
thelignocellulosic fiber filter to be used in primary
wastewater treatment (MohdGhazali et al., 2008).
This research aims to investigate and evaluate the ability
of pressmud and EFB mixed with local soil to reduce and
minimize the migration of heavy metals in landfill
leachate. It consists of field data collection and laboratory
experiments where a field data collection involves
acquiringleachate samples from a municipal solid waste
disposal site and fresh soil from several areas in Nibong
Tebal, Penang.The laboratory experiments on the other
hand, involves physico-chemical analysis
andcharacterization of soil and suitability of the soil when
implemented at the landfill. Selected soil samples were
mixed with certain ratio at different weight percentages.
II. MATERIALS AND METHODS
The local soilsample, which is used as daily cover was
taken from hilly areas around Penang whereas the
leachate was collected from Pulau Burung
landfill.Pressmud was collected from a sugar mill
company, Malayan Sugar Manufacturing (MSM) Sdn.
Bhd. at Seberang Perai, Penang. Empty Fruit Bunches
(EFB) of oil palm was obtained from United Oil Palm
Industries Sdn. Bhd., a local millat Nibong Tebal, Penang.
The collected local soil, pressmud and EFB were then air-
dried and sieved through 200 mm sieve to remove large
and coarse materials. The soil samples, pressmud and
EFB were then dried again and analyzed for their
physico-chemical characteristics. Raw leachate was
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collected from the main leachate pond at Pulau Burung
Landfill. Upon collection, all leachate samples were kept
in High Density Polyethylene (HDPE) bottles and
preserved at approximately 4o
C temperature. The leachate
sample was then analyzed for their heavy metals
concentrations by using Inductively Coupled Plasma-
Optical Emission Spectrometry (ICP-OES, Model Varian
715-ES).
The laterite soil was mixed with pressmudand EFBat
different percentages of weight ratio namely
50S:40P:10E, 50S:30P:20E, 50S:25P:25E, 50S:10P:40E
and 50S:20P:30E respectively. The mixture specifications
are shown in Table 1. Eachmixture was then grounded in
a rotary blender to achieve homogeneity and when mixing
completed, all samples were kept in sealed plastic bags to
control and retain mixture moisture contentfor further
analysis.
Table.1: Individual material and mixtureratio
Materials Specification
Soil 100% soil
Pressmud 100% pressmud
EFB 100% EFB
50S:40P:10E 50% soil+40% pressmud+10% EFB
50S:30P:20E 50% soil+30% pressmud+20% EFB
50S:25P:25E 50% soil+25% pressmud+25% EFB
50S:10P:40E 50% soil+10% pressmud+40% EFB
50S:20P:30E 50% soil+20% pressmud+30% EFB
Batch Equilibrium Tests (BET) were performed to
evaluate the removal efficiency of heavy metals such as
As2+
, Cd2+
, Cr2+
, Cu2+
, Fe2+
, Ni2+
and Zn2+
using soil,
pressmud, EFB and sample of soil-pressmud-EFB
mixtures. From this test, the adsorption capability of the
tested soil samplescan be determined by using a
percentage removal equation.
Heavy metal species were selected based on the
concentration of heavy metals present in raw landfill
leachate. In this study, the initial concentrations of heavy
metals were preset at 1, 2, 4, 6, 8 and 10ppm which acted
as a synthetic landfill leachate. A synthetic leachate will
have no interference from other parametersand makes it
easier to evaluate the effect of chemical permeants on the
migration of heavy metals into landfill soils (Badv and
Omidi, 2007; Ruhl and Daniel, 1997; Joseph et al., 2001;
Weber et al., 2002; Shang and Rowe, 2003; Kolstadet al.,
2004; Hraporic and Rowe, 2002; Rittman et al., 2003).
In this experiment, synthetic landfill leachate with initial
concentrations of heavy metals were mixed with the
materials (individual samples of soil, presmud, EFB and
mixtures of soil- pressmud-EFB) at a ratio of 10:1 (10 mL
solution and 1 g of sample). The samples were placed in a
tube and shaken using a horizontal shaker for 24 hours in
accordance to the standard method (USEPA, 1992). After
reaching an equilibrium point, the tubes werecentrifuged
at 5,000 rpm for 25 minutes to separate the liquid and
solid portions. Next, the supernatant fluid was filtered
with Whatman filter paper (No. 42) and then analyzed
using ICP-OES.
From the analysis, the concentration of heavy metals that
remained in the filtrate was used to calculate the amount
of heavy metals absorbed by the soil, pressmud, EFB and
soil-pressmud-EFB mixtures. The removal percentage of
heavy metals from initial concentration (Co) in the
leachate was calculated from Equation 1 (Shaw, 2001).
Adsorption capacity and percent removal were then used
to optimize the material conditions:
Equation 1
Where,
Co= initial concentration of the solution (mg/L)
Ce = the equilibrium concentration left in the
solution (mg/L)
III. RESULTS AND DISCUSSION
Concentration of Heavy Metals in PulauBurung Landfill
Leachate
Table 2 shows the range of heavy metals concentration in
the leachate from PulauBurung Landfill. From the results,
the highest concentration is found to be Fe2+
with 4.79-
10.19 mg/L. Concentrations of As2+
, Cd2+
, Cr2+
,
Cu2+
,Mn2+
, Ni2+
, Pb2+
and Zn2+
are 0.11-0.27 mg/L, 0.22-
0.35 mg/L, 0.09-0.16 mg/L, 0.04-0.05 mg/L, 0.42-1.41
mg/L, 0.24-0.43 mg/L. 0.05-0.08 mg/L and 0.28-0.60
mg/L respectively. It is good to note that some heavy
metals concentrations such as As2+
, Cd2+
, Cr2+
, Fe2+
, Mn2+
and Ni2+
exceeded the maximum permissible
concentration (MPC) limits stipulated in the Malaysian
EQA 1974 leachate discharge standards in Malaysia.
Leachate is a liquid effluent that is released or seeps from
a landfill area that ends up at the bottom of the waste
piles. As water percolates through the waste material,
they will accumulate and produce an aqueous effluent.
The characteristic of the leachate relies heavily on
weather condition, waste characteristic and composition,
landfill age and depth of buried waste (Ghazali et al.,
2008, Hassan et al., 2001 and Mohamad, 2014). Young
leachate tends to be acidic due to the presence of volatile
fatty acid with a pH of 6-7 or lower and it is more
polluted as the BOD5can reach up to 81000 mg/L
compared to old leachate witha BOD5of 4200 mg/L
(Bashir, 2010).
% Removal = Co - Ce
Co
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Table.2: Heavy metals concentrations in PulauBurung Landfill leachate
Heavy
Metals
Concentration of Heavy
Metals in mg/L (ppm)
Concentration of Heavy
Metals in mg/L (ppm)
from previous research
(Harlina et al., 2016)
Arsenic, As2+
0.11-0.27 -
Cadmium, Cd2+
0.22-0.35 -
Chromium, Cr2+
0.09-0.16 0.55-0.70
Copper, Cu2+
0.04-0.05 0.48-0.86
Iron, Fe2+
4.79-10.19 -
Manganese, Mn2+
0.42-1.41 0.19-0.66
Nickle, Ni2+
0.24-0.43 0.18-0.54
Lead, Pb2+
0.05-0.08 0.18-0.61
Zinc, Zn2+
0.28-0.60 0.93-3.5
Background of Heavy Metals Contents in Local Soil,
Pressmud and EFB
Basic properties and heavy metals content of soil,
pressmud and EFB are shown in Table 3, which are based
on British Standard BS1377 (1975) and ASTM Standard
(ASTM, D2216-17). The results from the grain size
analysis showed that the soil contains 14.45% gravel,
48.78% sand, 32.67% silt and 4.1% clay. This clearly
illustrates that the grain size of soil is silty sand.
Meanwhile grain size analysis of pressmud shows 2.04%
sand, 95.67% silt and 2.29% clay. This simply means that
the grain size of the pressmud is silty. Specific gravity of
soil, pressmud and EFB are 2.44, 1.61 and 0.87
respectively.
The results of Atterberg limits for the soil revealedits
liquid limit of 27.65%, plasticity limit of 17.45% and
plasticity index of 10.2%. The results of Atterberg limits
for the pressmud showed the liquid limit to be 37.27%,
plasticity limit of 20.8% and plasticity index of 16.47%.
Generally, both soil and pressmud are classified as
materials with low plasticity as the liquid limits are less
than 50% according to the US unified soil classification
system. The specific surface area of the soil particle is
22.9 m2
/g which is influenced by the presence of
mineralogy content in the soil. The specific surface area
of the pressmud particle is 17.80 m2
/gwhereas EFB shows
an area of 18.3 m2
/g. The pH value of soil is at 4.45 which
is in acidic condition primarily due to the low lime
content. From previous studies, laterite soil is considered
to be strongly acidic, exhibiting pH 4.4 (Parvathi, 2012).
The pH of pressmud and EFBare 8.06 and 8.63
respectively which are slightly inclined towards the
alkaline state. The heavy metals concentrations in the soil
samples are very low and someof them are not detectable,
meaning that the selected samples are notcontaminated
soil.On the contrary, the heavy metals concentration
background in the pressmud and EFB fiber are quite high
compared to the soil, but still very low and consideredin a
background level.
Table.3: Basic Properties and Heavy Metals Content of Soil, Pressmud and EFB
Characteristics Soil Pressmud EFB
Particle Size (%)
Gravel 14.45 0 -
Sand 48.78 2.04 -
Silt 32.67 95.67 -
Clay 4.1 2.29 -
Specific Gravity 2.44 1.61 0.87
Liquid Limit (%) 27.65 37.27 -
Plastic Limit (%) 17.45 20.8 -
Plasticity Index (%) 10.2 16.47 -
Specific Surface Area (m2
/g) 22.9 17.8 18.3
pH 4.45 8.05 8.63
Moisture Content 18.51 34.53 14.4
Heavy Metals Content (mg/L)
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Arsenic, As
Cadmium, Cd
Chromium, Cr
Copper, Cu
Iron, Fe
Manganese, Mn
Nickle, Ni
Lead, Pb
Zinc, Zn
0.43
0.08
0.23
0.05
215
0.66
0.03
0.57
2.56
0.12
0.02
0.08
0.26
8.68
0.69
0.07
0.14
1.13
0.18
ND
0.08
0.22
5.80
0.4
0.02
0.09
1.53
Removal Efficiency of Heavy Metals
Effect of Initial Concentration of Heavy Metals on
Removal Efficiencies
Batch test was used to study the removal efficiency of the
materials. According to Jessberger et al., (1997), batch
test provides a relatively quick method of estimating the
contaminant adsorption capacity of any liner material.
The effect of initial heavy metals concentration on the
removal efficiency by variant soil mixtures of
50S:40P:10E, 50S:30P:20E, 50S:25P:25E, 50S:10P:40E
and 50S:20P:30E was systematically investigated by
modifying the initial concentration from 1 to 10 ppm (1
ppm, 2 ppm, 4ppm, 6 ppm, 8 ppm and 10 ppm). Figure 3-
9 show the percentage removal of As2+
, Cd2
+, Cr2+
, Cu2+
,
Fe2+
, Ni2+
and Zn2+
.
Figure 3 shows the percentage removal of As2+
by the soil
and soil-pressmud-EFB mixtures ranges from 1-10 ppm
as an initial concentration. From the results, it is observed
that the percentage removal of heavy metals from the
solution by the soil-pressmud-EFB mixtures sample
increased with the increase of initial concentration. This
indicates that the removal efficiency of the samples is
influenced by the heavy metals concentration and a
positive correlation between the sorption capacity and
basic properties of soils and soil-pressmud-EFB mixtures.
The removal of As2+
by the soil alone dramatically
reduced to 61.1% at concentration 1 and 10 ppm while
soil-pressmud-EFB mixtures achieved 99.3% removal at
concentration of 4 ppm. It clearly indicates that the soil-
pressmud-EFB mixtures have great potential in removing
heavy metals contents in the soil. However, use of
pressmud alone only yielded 79.0-98.2% percentage
removal between concentration 1 until 10 ppm but the
value is higher compared to using only soil. Meanwhile,
EFB only showed 33.7% removal of As2+
.
Fig.3: Effect of initial As2+
concentration on the removal efficiency
Figure 4 shows the percentage removal of Cd2+
by the
soil-pressmud-EFB mixtures. The percent removal of
heavy metals from the solution by the soil-pressmud-EFB
mixtures decreased with the increase of initial
concentration. The maximum percentage removal from
soil-pressmud-EFB mixtureswas foundat concentration of
2 ppm with 98.8%. Meanwhile soil alone just
removedless than 5.35% at the same aforementioned
concentration. From the results obtained, it can be said
that the adsorption capability of the soil will improve with
the presence of pressmud and EFB in the soil. The results
obtained from this experiment are similar to studies done
0
10
20
30
40
50
60
70
80
90
100
1 2 4 6 8 10
PercentageofAs2+removal,%
Initial As2+ concentration mg/L
As2+
Soil
Pressmud
EFB
50S:40P:10E
50S:30P:20E
50S:25P:25E
50S:10P:40E
50S:20P:30E
7. International Journal of Advanced Engineering, Management and Science (IJAEMS) [Vol-3, Issue-1, Jan- 2017]
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byMunaf et al. (1997) and Vaca-Paulin et al. (2006)
despite using other organic matter as a soil admixture.On
a positive note, pressmud showedexcellent and the
highest Cd2+
removal of 99.9% compared to EFB.
Fig.4: Effect of initial Cd2+
concentration on the removal efficiency
The removal of Cr2+
by the soil-pressmud-EFB mixtures
is depicted inFigure 5. The mixtures percentage removal
was observed to be 99.5% when tested at concentration 1
ppm. This is due to the existence of surface charge of clay
mineral, pressmud and EFB material that contributes to
the adsorption of heavy metals. Meanwhile the percentage
removal of soil alone gradually reduced to only 17.5%
removal at concentration 10 ppm. Percentage removal of
Cr2+
for pressmud also gave the highest readingsspanning
from 97.6-98.7% removal while EFB showed only 87.2%
removal.
Fig.5: Effect of initial Cr2+
concentration on the removal efficiency
Figure 6 indicates the percentage removal of Cu2+
by the
soil alone and soil-pressmud-EFB mixtures. All soil-
pressmud-EFB mixtures exhibited a minimum percentage
removal of 97.1% at concentration 6 ppm. Soilâs
maximum Cu2+
removal was recorded at 33.8% while
pressmud and EFB presented highremoval values of
96.3% and 90.0% respectively. Most soil-pressmud-EFB
mixtures removed Cr2+
more than 97%. This is akin to
several other studies in a sense that admixture of soil can
enhance the capability of adsorbing metals especially
materials with very high organic content. Previous studies
also indicate that one of the possible mechanisms that
0
10
20
30
40
50
60
70
80
90
100
1 2 4 6 8 10
PercentageofCd2+removal,%
Initial Cd2+ concentration mg/L
Cd2+
Soil
Pressmud
EFB
50S:40P:10E
50S:30P:20E
50S:25P:25E
50S:10P:40E
50S:20P:30E
0
10
20
30
40
50
60
70
80
90
100
1 2 4 6 8 10
PercentageofCr2+removal,%
Initial Cr2+ concentration, mg/L
Cr2+
Soil
Pressmud
EFB
50S:40P:10E
50S:30P:20E
50S:25P:25E
50S:10P:40E
50S:20P:30E
8. International Journal of Advanced Engineering, Management and Science (IJAEMS) [Vol-3, Issue-1, Jan- 2017]
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control heavy metals removal in a solute environment is sorption activity (Christensen et al., 2001).
Fig.6: Effect of initial Cu2+
concentration on the removal efficiency
Figure 7 shows the percentage removal for Fe2+
for soil
alone and soil-pressmud-EFB mixtures. The percentage
removal increasedas the initial concentration increased.
The highest percentage removal by the
mixtureswasobserved to be 98.9% at concentration 6 ppm
while the lowest was 97.6% at concentration 10 ppm. It
clearly shows that most percentage removals are more
than 97%. By incorporatingpressmud and EFB into the
soil, the performance of metals ion adsorption was seen to
increase and improved. Similar to the previous result,
pressmud indicated the highest removal value of 99.3%
followed by EFB with only 61.4%.
Fig.7: Effect of initial Fe2+
concentration on the removal efficiency
The removal percentage of Ni2+
is shown in Figure 8. It
clearly shows the percentage removal decreasedas the
initial concentration increased. The highest removal was
89.9% while the lowest was 86.3% both at concentration
1 ppm. Using only soilcould remove maximum 32.6%.
Therefore, it can be said that soil alone cannot help to
adsorb the heavy metals efficiently, which exerts a need
toalso usepressmud and EFB as admixtures into the soil.
As a result, there will be an enhancement in the capacity
and capability of the media to adsorb pollutant or heavy
metals. For Ni2+
, pressmud and EFB did not show much
disparity in terms of percentage removal with the former
removing 85.1% andthe latter removed 86.3%.
0
10
20
30
40
50
60
70
80
90
100
1 2 4 6 8 10
PercentageofCu2+removal,%
Initial Cu2+ concentration, mg/L
Cu2+
Soil
Pressmud
EFB
50S:40P:10E
50S:30P:20E
50S:25P:25E
50S:10P:40E
50S:20P:30E
0
10
20
30
40
50
60
70
80
90
100
1 2 4 6 8 10
PercentageofFe2+removal,%
Initial Fe2+ concentration, mg/L
Fe2+
Soil
Pressmud
EFB
50S:40P:1
0E
50S:30P:2
0E
50S:25P:2
5E
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Fig.8: Effect of initial Ni2+
concentration on the removal efficiency
Figure 9 shows the percentage removal of Zn2+
for soil
and soil-pressmud-EFB mixtures. It also shows a trend of
the decrease of percentage removal as the initial
concentration increased similar in the case of Ni2+
. The
highest removal performed by soil-pressmud-EFB
mixtures was 99.8% while the lowest was 98.1% but the
highest of percentage removal of soil alone was only
6.76%. However, percentage removal of pressmudwas
quite high around 98.8% while EFB presented moderate
Zn2+
removal of 64.6%. By and large, the results are
strong proofs to signify the efficacy of using these
mixturesto remove heavy metals concentration in lieu of
using only soil.
Fig.9: Effect of initial Zn2+
concentration on the removal efficiency
IV. CONCLUSIONS
As a conclusion, the soil-pressmud-EFB mixtures are
highly potential material, which can be a daily cover
substitute due to the excellent heavy metals removal
capability if compared to individual soil use. The best
mixture ratiosto eliminate As2+
, Cd2+
and Cr2+
are
50S:10P:40E, 50S:30P:20E and 50S:25P:25E that
achieved percentage removal of 99.3%, 99.8% and 99.5%
respectively. For the case of Cu2+
, Fe2+
, Ni2+
and
Zn2+
removal, it is more suitable to use mixture ratios of
50S:20P:30E, 50S:30P:20E,50S:25P:25E and
50S:30P:20E with percentage removal of 98.2%, 98.9%,
89.9% and 99.8% accordingly. Vis-Ă -vis the use of only
soil as the conventional method, the experiments signify
that most soil mixtures were able to remove heavy
metalsup to the highest percentage of 99.8%. Amongst
main contributing factor to the excellent performance is
due to the high organic and fiber content present in
pressmud and EFB.
0
10
20
30
40
50
60
70
80
90
100
1 2 4 6 8 10
PercentageofNi2+removal,%
Initial Ni2+ concentration, mg/L
Ni2+
Soil
Pressmud
EFB
50S:40P:10E
50S:30P:20E
50S:25P:25E
50S:10P:40E
50S:20P:30E
0
10
20
30
40
50
60
70
80
90
100
1 2 4 6 8 10
PercentageofZn2+removal,%
Initial Zn2+ concentration, mg/L
Zn2+
Soil
Pressmud
EFB
50S:40P:10E
50S:30P:20E
50S:25P:25E
50S:10P:40E
50S:20P:30E
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ACKNOWLEDGEMENT
The authors acknowledge Universiti Sains Malaysia
(USM), PLB Terang Sdn. Bhd. and Malayan Sugar
Manufacturing (MSM) Sdn. Bhd. for their contributions
to the study. Acknowledgement is also made to USM
Research University Individual (RUI) Grant
(1001/PAWAM/814287) and Solid Waste Management
Cluster University Grant Scheme (1001/CKT/870023).
REFERENCES
[1] Sharifah, N.S.I. and Latifah, A.M. (2013). The
challenge of future landfill: A case study of
Malaysia. Journal of Toxicology and Environmental
Health Sciences5(6): 86-96 .
[2] Zhang Z, Li M, Chen W, Zhu S, Liu N, Zhu L
(2010). Immobilization of lead and cadmium from
aqueous solution and contaminated sediment using
nano-hydroxyapatite. Environ. Poll. 158:514-519.
[3] Norma, D, A Fernandes, MJ Pacheco, L CirĂaco&A
Lopes (2012). Electrocoagulation and Anodic
OxidationIntegrated Process to Treat Leachate from
a Portuguese Sanitary Landfill. Portugaliae
Electrochimica Acta; 30: 221-234.
[4] Jumaah, M.A. and Othman, M.R. (2015).
Optimization of operating conditions for landfill
leachate treatment using electrochemical oxidation
technique. International Journal of ChemTech
Research 8:783-787.
[5] AdamcovĂĄ, Dana, Magdalena VaverkovĂĄ, and
EliĆĄkaBĆouĆĄkovĂĄ. (2016) Emission assessment at the
ĆĄtÄpĂĄnovice municipal solid waste landfill focusing
on CH.Journal of Ecological Engineering17: 9-17.
[6] Bakraouy, H., S. Souabi, K. Digua, and A. Pala.
(2015). Removal of phenol and surfactant from
landfill leachate by coagulation-flocculation process.
Scientific Study & Research. Chemistry & Chemical
Engineering, Biotechnology, Food Industry; 16: 329.
[7] Fauziah, S.H. and Agamuthu, P. (2012). Trend in
sustainable landfilling in Malaysia, a developing
country. Waste Management & Research 30: 656â
663.
[8] Jaffar, Y.M., Lee, Y.H. and Salmijah, S. (2009).
Toxicity testing and the effect of landfill leachate in
Malaysia on behaviour of common carp (Cyprinus
carpio L., 1758; Pisces, Cyprinidae). American
Journal of Environmental Science 5: 209â217.
[9] Trivedi, R.N. and Raj, G. (2002). Encyclopedia of
Environmental Science: Management of Pollution
Control. Akashdeep Publishing House, India.
[10]Aziz, S.Q., Aziz, H.A., Yusoff, M.S., Bashir, M.J.K.
and Umar M. (2010). Leachate characterization in
semi-aerobic sanitary landfills: A comparative study.
Journal of Environmental Management 91: 2608-
2614.
[11]Liermann, T.A. (2009). Fiji Islandsâ naboro landfill
leachate quality analysis and the applicability of
developed versus small island developing state
discharge standards. M.Sc Thesis of Environmental
Engineering. Michigan Technological University.
[12]Kamarudin, S. (2010). Enhancement of natural local
soil to minimize the migration of contaminants using
empty fruit bunch (EFB) in Taiping Landfill.
Dissertation of PhD. Thesis, School of Civil
Engineering, USM, Malaysia. (Unpublished).
[13]Mohd Nawawi, M.G., Othman, N., Sadikin, A.N.
and Che Ismail, N. (2008). Lignocellulosic fiber
media filters as a potentialtechnology for primary
industrial wastewatertreatment. Jurnal Teknologi,
49(F): 149â157.
[14]Ruhl, J. L. & Daniel, D. E. (1997).
Geosynthetic clay liners permeated with chemical
solutions and leachates, ASCE Journal of
Geotechnical and Geoenvironmental Engineering
123 (4): 369-381.
[15]Joseph, J. B., Styles, J. R., Yuen, S. T. & Cressey,
G. (2001). Variation in clay mineral performance in
the presence of leachates. Proceeding of the Eighth
International Landfill Symposium, Sardinia, Italy.
[16]Shang, J. Q. & Rowe, R. K. (2003). Detecting
landfill leachate contamination using soil
electrical properties. Practice Periodical of
Hazardous, Toxic, and Radioactive Waste
Management, Vol. 7, No. 1.
[17]Kolstad, D. C., Benson, C. H. & Edil, T. B.
(2004). Hydraulic conductivity and swell of non-
prehydrated geosynthetic clay liners permeated
with multispecies inorganic solutions. ASCE
Journal of Geotechnical and Geoenvironmental
Engineering, Vol. 130, No. 12, pp. 1236-1249.
[18]Hrapovic, L. & Rowe, R. K. (2002). Intrinsic
degradation of volatile fatty acids in laboratory
compacted clayey soil. Journal of Contaminant
Hydrology, Vol. 58, pp. 221-242.
[19]Rittmann, B. E., Banaszak, J. E., Cooke, A. &
Rowe, R. K. (2003). Biogeochemical evaluation of
mechanisms controlling CaCO3(s) precipitation in
landfill leachate collection systems. ASCE
Journal of Environmental Engineering, Vol. 129,
No. 8, pp. 723-730.
[20]Weber, W. J., Jang, Y. C., Towsend, T. G. &
Laux,S. (2002). Leachate from land disposed
residential construction waste. ASCE Journal of
Environmental Engineering, Vol. 128, No. 3, pp.
237-245.
[21]United Nations Environment Programme UNEP.
(2005). Solid Waste Management I. pp. 524.
[22]Wan Zuhairi, W.Y. (2010). Note of waste
management. Universiti Kebangsaan Malaysia.
11. International Journal of Advanced Engineering, Management and Science (IJAEMS) [Vol-3, Issue-1, Jan- 2017]
Infogain Publication (Infogainpublication.com) ISSN : 2454-1311
www.ijaems.com Page | 47
[23]Bagchi, A. (2004). Design of landfills and integrated
solid waste management. Hoboken, New Jersey.
John Wiley and Son, Inc.
[24]Makasa, B. (2004); Internet Resource Material,
International Institute for Aerospace and Earth
Science (ITC) Section, Engineering Geology,
Kanaalwey. Netherlands.
www.aerospaces.org.ne/physicalearthscience.
[25]Akeem, A.R., Olugbenro, O. F. and Kehinde, J.A.
(2012). Production and testing of lateritic
interlocking blocks. Journal of Construction in
Developing Countries 17 (1): 33â48.
[26]Bhosale, P.R., Chonde Sonal, G. and Raut, P. D.
(2012). Studies on Extraction of Sugarcane Wax
from Press Mud of Sugar Factories from Kolhapur
District, Maharashtra. Journal of Environmental
Research and Development 6 (3A).
[27]Faradilla, L. (2006). Dye removal from simulated
wastewater by using empty fruit bunch as an
adsorption agent. Dissertation of Bachelor Thesis,
Faculty of Engineering and Natural Resource, Koleh
Universiti Kejuruteraan & Teknologi Malaysia.
(Unpublished).
[28]U.S. Environmental Protection Agency (1992).
Engineering Bulletin Slurry Walls. EPA 540/S-
92/008.
[29]Shaw, J.N., 2001. Iron and aluminum oxide
characterization for highly-weathered Alabama
ultisols. Communications in soil science and plant
analysis, 32(1-2): 49-64.
[30]EQA (1974) Standard discharge limits. Regulation
2009, under Laws of Malaysia-Malaysia
Environmental Quality Act (1974).
[31]Bashir, M.J.K., 2010. Removal of Colour, COD and
NH3-N from Semiaerobic Landfill Leachate Using
Anionic and Cationic Resin. UniversitiSains
Malaysia. (Unpublished).
[32]BS1377. (1975) Method of test for soil civil
engineering purposes, British Standard Institution,
London.
[33]ASTM D 2166, (1984) Standard Test Method for
Unconfined Compressive Strength of Cohesive Soil.
[34]Parvathi, M. (2012) A study on soil testing using
SOA and its future considerations. Computing,
Electronics and Electrical Technologies (ICCEET),
2012 InternationalConference on, 2012. IEEE: 894-
899.
[35]Jessberger, H.L., Onnich, K., Finsterwalder, K., and
Beyer, S. (1997) Experimental and numerical studies
of contaminant transport through mineral liners and
resulting improvements in liner materials. In:
August, H., Holzlohner, U. and Meggyes, T.(Eds.),
Advanced Landfill Liner System. Thomas Telford,
London, pp 222-235.
[36]Christensen, TH., Kjeldsen, P. and Berge, P.L.
(2001). Biogeochemistry of landfill leachate plume.
Applied Geochemistry 16: 659â718.
[37]Maheera, M., 2014. Minimization of heavy metals
migration in landfill leachate by using admixture of
laterite soil n pressmud. Dissertation of MSc. Thesis,
School of Industrial Technology, USM, Malaysia.
(Unpublished).
[38]Hassan, M.N., Chong, T. L., Rahman, M. N., Salleh,
M. N., Zakaria, Z. and Awang, M. (2001)
Proceedings Sardinia 2001, Eighth International
Waste Management andLandfill Symposium S.
Margherita di Pula, Cagliari, Italy; 1-5 October 2001
by CISA, Environmental Sanitary Engineering
Centre, Italy.
[39]Munaf, E., Zein, R., Kurniadi, R. and Kurniadi, I.,
1997. The use of rice husk for removal of phenol
from waste water as studied using 4-aminoantipyrine
spectrophotometric method. Environmental
Technology, 18(3), pp.355-358
[40]Vaca-Paulin, R., Esteller-Alberich, M.V., Lugo-De
La Fuente, J. and Zavaleta-Mancera, H.A., 2006.
Effect of sewage sludge or compost on the sorption
and distribution of copper and cadmium in soil.
Waste management, 26(1), pp.71-81.