This document discusses various water treatment processes for removing microbes from drinking water sources. It covers:
1) Storage processes like reservoirs and aquifers that can reduce microbe levels over time through natural die-off. Studies found enteric virus reductions of 400-1000-fold after 6-7 months of storage.
2) Chemical coagulation and flocculation that uses chemicals like alum to destabilize particles and microbes, causing them to clump together and be removed by sedimentation or filtration. Studies found this process can achieve over 99% removal of enteric microbes.
3) Filtration processes like slow sand filters, rapid sand filters, and membrane filters that can achieve high
This document discusses various water treatment processes for removing pathogens from drinking water sources. It begins by explaining that drinking water should be free of disease-causing microbes but contaminated sources require treatment. Water treatment aims to provide safe drinking water by using the best source and protecting it from contamination. When adequate sources are unavailable, treatment processes are used to remove or inactivate microbes. Processes discussed include storage, disinfection (physical and chemical), filtration (rapid sand, membrane), coagulation, softening and others. The document provides details on the microbiological reductions achieved by each process and factors influencing their effectiveness.
This document summarizes various water treatment processes used to remove pathogens from drinking water. It discusses sources of water and the need for treatment due to microbial contamination. The main water treatment processes covered include storage, filtration (slow sand, rapid sand), coagulation/flocculation, softening and disinfection (chlorine, UV). It provides details on the typical microbial reductions achieved by each process and the factors influencing effectiveness.
This document discusses water purification methods for both large and small scale. For large scale, it describes treating raw water sources through storage, filtration, and disinfection using chlorination, ozonation, or UV irradiation. Slow sand filtration and chlorination are effective at removing bacteria, viruses, and parasites. For small scale, it recommends boiling, chemical disinfection, or ceramic filtration. Wells can be disinfected during outbreaks by bleaching. Bottled water may be purified through multiple barriers like UV, distillation, or ozonation.
This document provides information on water purification methods at different scales. On a large scale, water is purified through storage, sedimentation, filtration (rapid sand and slow sand), and disinfection (usually chlorination). On a medium scale, adding bleach or chlorinated lime is common. On a small scale, boiling, distillation, and adding chemicals like bleach or iodine can purify water. The document also discusses rapid sand filtration versus slow sand filtration and different water quality testing standards.
Water purification is a 14-step process that begins with water collection and ends with independent quality testing. The steps include activated carbon filtration, water softening, reverse osmosis for demineralization, remineralization by adding selected minerals, micron filtering, ultraviolet and ozone disinfection, bottling control, packaging quality assurance, line sanitation, and multiple levels of quality control and testing to produce safe drinking water.
Water purification is a 14-step process that begins with water collection and ends with independent quality testing. The steps include activated carbon filtration, water softening, reverse osmosis for demineralization, remineralization by adding selected minerals, micron filtering, ultraviolet and ozone disinfection, bottling control, packaging quality assurance, line sanitation, and multiple levels of quality control and testing to produce safe drinking water.
This document provides an overview of various wastewater treatment technologies. It begins with initial screening and primary treatment techniques like sedimentation and filtration to remove solids. It then discusses secondary biological treatment using aerobic and anaerobic processes. Finally, it covers tertiary treatment techniques like disinfection using chlorination, ozonation, and UV irradiation. The document serves as a comprehensive introduction to the different stages and methods involved in wastewater treatment.
This document discusses various water treatment processes for removing pathogens from drinking water sources. It begins by explaining that drinking water should be free of disease-causing microbes but contaminated sources require treatment. Water treatment aims to provide safe drinking water by using the best source and protecting it from contamination. When adequate sources are unavailable, treatment processes are used to remove or inactivate microbes. Processes discussed include storage, disinfection (physical and chemical), filtration (rapid sand, membrane), coagulation, softening and others. The document provides details on the microbiological reductions achieved by each process and factors influencing their effectiveness.
This document summarizes various water treatment processes used to remove pathogens from drinking water. It discusses sources of water and the need for treatment due to microbial contamination. The main water treatment processes covered include storage, filtration (slow sand, rapid sand), coagulation/flocculation, softening and disinfection (chlorine, UV). It provides details on the typical microbial reductions achieved by each process and the factors influencing effectiveness.
This document discusses water purification methods for both large and small scale. For large scale, it describes treating raw water sources through storage, filtration, and disinfection using chlorination, ozonation, or UV irradiation. Slow sand filtration and chlorination are effective at removing bacteria, viruses, and parasites. For small scale, it recommends boiling, chemical disinfection, or ceramic filtration. Wells can be disinfected during outbreaks by bleaching. Bottled water may be purified through multiple barriers like UV, distillation, or ozonation.
This document provides information on water purification methods at different scales. On a large scale, water is purified through storage, sedimentation, filtration (rapid sand and slow sand), and disinfection (usually chlorination). On a medium scale, adding bleach or chlorinated lime is common. On a small scale, boiling, distillation, and adding chemicals like bleach or iodine can purify water. The document also discusses rapid sand filtration versus slow sand filtration and different water quality testing standards.
Water purification is a 14-step process that begins with water collection and ends with independent quality testing. The steps include activated carbon filtration, water softening, reverse osmosis for demineralization, remineralization by adding selected minerals, micron filtering, ultraviolet and ozone disinfection, bottling control, packaging quality assurance, line sanitation, and multiple levels of quality control and testing to produce safe drinking water.
Water purification is a 14-step process that begins with water collection and ends with independent quality testing. The steps include activated carbon filtration, water softening, reverse osmosis for demineralization, remineralization by adding selected minerals, micron filtering, ultraviolet and ozone disinfection, bottling control, packaging quality assurance, line sanitation, and multiple levels of quality control and testing to produce safe drinking water.
This document provides an overview of various wastewater treatment technologies. It begins with initial screening and primary treatment techniques like sedimentation and filtration to remove solids. It then discusses secondary biological treatment using aerobic and anaerobic processes. Finally, it covers tertiary treatment techniques like disinfection using chlorination, ozonation, and UV irradiation. The document serves as a comprehensive introduction to the different stages and methods involved in wastewater treatment.
The document discusses current industrial wastewater treatment processes in the dairy industry. It begins with an overview of dairy operations and the types of wastes generated. It then describes various treatment steps including pretreatment, primary treatment using screens and settling tanks, and secondary biological treatment using activated sludge or oxidation ponds. Tertiary treatment may include coagulation, filtration and disinfection. The document also discusses some modifications to treatment processes like using membranes or organo-zeolites and issues around dairy wastewater treatment.
This is a power point presentation on design of a 30 MLD sewage treatment plant. It includes the different characteristics of waste water,various treatment units, design results and a layout of sewage treatment plant.
Visit my slide share channel for downloading report of this project.
This document discusses environmental factors related to health, with a focus on water. It covers water requirements, sources of water supply like rain, surface water and ground water. It discusses water pollution, purification methods like filtration and disinfection, and standards for drinking water quality. The goals of national water programs in India to improve access are also mentioned.
This document provides information on aquaculture environment management and water quality management. It discusses analyzing water quality parameters, understanding ideal value ranges, and using chemical treatment and mechanical control. Specific parameters like nitrogen, pH, dissolved oxygen are analyzed. Common treatments include liming to adjust pH, using alum as a coagulant, and chlorination for disinfection. Filtration through gravel or activated carbon can be used for mechanical control. The objective is to manage water quality to provide optimal growing conditions for farmed fish.
Sewage treatment is the process of removing contaminants.pptxKediromer
The document provides information about the sewage treatment process at Kombolcha Industrial Park Sewage Treatment Plant in Ethiopia. It describes the various unit processes involved, including physical processes like screening and sedimentation, biological processes like activated sludge and anaerobic digestion, and tertiary treatments like filtration. The plant has a design capacity of 2500 cubic meters per day and treats sewage to standards suitable for safe disposal or reuse.
This document discusses water pollution, purification, and disinfection. It outlines various causes and sources of water pollution including sewage, industrial waste, and agricultural runoff. It then describes common waterborne diseases and laws governing water pollution. The document provides details on large and small-scale water purification methods including storage, filtration using slow sand filters and rapid sand filters, and disinfection using chlorination. It concludes with discussing other disinfection methods like ozonation and UV light.
The typical water purification system involves storage, filtration, and disinfection. Storage allows physical, chemical, and biological purification as turbidity and bacteria are reduced over time. Filtration then removes 98-99% of remaining bacteria and other impurities using slow or rapid sand filters. The final step of disinfection, most commonly using chlorine, kills any remaining pathogens to make the water safe for human use.
Disinfection is the process of removing or killing pathogens in water. It is done to terminate the growth and reproduction of microorganisms so they pose no risk of infection. Common pathogens targeted include bacteria, viruses, protozoa and helminths. Common disinfectants used in water treatment include chlorine, chlorine dioxide, ozone, bromine, copper, silver and potassium permanganate. Disinfectants work by altering or destroying essential structures in microbes to inactivate them. Disinfection is usually one of the final steps in water purification to reduce pathogens and make drinking water safe.
The document describes new techniques for wastewater management, including filtration methods like media, membrane, and hybrid filtration systems. It also discusses disinfection systems using chlorine, ozone or UV radiation. The techniques aim to remove solid matter through various physical, chemical and biological processes like sedimentation, filtration, and the use of bacteria. Treated water and sludge can then be disposed of safely.
All living things require clean, uncontaminated water as the most crucial compound for life on Earth
Ideally, drinking water should be clear, colorless, and well aerated, with no unpalatable taste or odor, and it should contain no suspended matter, harmful chemical substances, or pathogenic microorganisms.
Wastewater discharge from industries, agricultural pollution, municipal wastewater, and poor environmental sanitation are the main sources of water contamination
The document summarizes a study being conducted by the DEP on using ribbed mussels to improve water quality in Jamaica Bay. It discusses:
1) A literature review finding ribbed mussels can filter particles and bacteria from water;
2) Microcosm experiments confirming mussels effectively filter pathogens and their filtration is only temporarily impacted by low salinity;
3) Ongoing mesocosm experiments at a larger scale to test mussel densities and responses to bacteria and freshwater pulses;
4) Plans for an in-situ pilot study deploying 75,000 mussels in Jamaica Bay to monitor their ability to naturally recruit and improve water quality.
Sewage and liquid waste management involves treating sewage through various stages. Sewage first undergoes pre-treatment which includes screening to remove large debris and grit removal to allow sand and gravel to settle. It then undergoes primary treatment which uses sedimentation to remove 50-70% of solids. Secondary treatment uses biological processes like activated sludge or trickling filters to reduce organic material using oxygen and bacteria. The treated effluent undergoes disinfection before being disposed of safely while sludge is digested and disposed of through methods like land application or sea disposal. Various treatment stages aim to purify sewage to acceptable standards before disposal.
This document provides guidelines for preventing water borne diseases through safe drinking water. It discusses how drinking contaminated water can cause over 2 million deaths annually, mostly in children in developing countries. It defines potable water and contaminated water. It classifies water borne diseases and lists examples transmitted through water, including water-borne, water-washed, water-based, and vector-borne diseases. The document then outlines the conventional water treatment process, including screening, aeration, pH correction, coagulation, sedimentation, chlorination, filtration, and disinfection. It aims to remove contaminants to make water safe for drinking.
This document outlines guidelines for preventing waterborne diseases through safe drinking water. It discusses how contaminated water can spread pathogens and cause over 2 million deaths annually, mostly in children in developing countries. Various waterborne diseases are classified based on their transmission route. The document then details conventional water treatment methods, including screening, aeration, coagulation, sedimentation, filtration, disinfection and pH adjustment to remove contaminants and make water potable.
The document provides an overview of wastewater treatment processes. It discusses the objectives of water treatment being to produce water that is safe, appealing, reasonably priced, and free of pathogens. The major operations discussed include physical processes like screening, mixing, and sedimentation as well as chemical processes like coagulation and biological processes like activated sludge. It then describes various treatment processes like primary treatment using sedimentation, pre-treatment involving screening and grit removal, and secondary/biological treatment using activated sludge or trickling filtration. Tertiary treatment methods like nutrient removal, disinfection, and filtration are also summarized. Finally, it discusses sludge treatment processes involving thickening and digestion.
Wastewater treatment by Muhammad Fahad Ansari 12IEEM14fahadansari131
Wastewater treatment involves multiple sequential processes to purify water. Physical processes like screening, sedimentation, and filtration are generally used first to remove solids. Chemical processes like coagulation, precipitation, and adsorption may then be used to remove dissolved substances. Biological treatment with microorganisms can further break down organic matter. The selection of treatment methods depends on the characteristics of the wastewater. Together, these treatment stages aim to clean wastewater to standards suitable for discharge or reuse.
Reverse osmosis desalination systems face several challenges including fouling of membranes, high energy consumption, removal of boron and fluoride, brine disposal, and solid waste generation. Solutions and developments have aimed to address these issues through improved pretreatment methods, development of new antifouling membranes, use of renewable energy sources, hybrid removal processes, and improved brine disposal and solid waste management. However, reverse osmosis systems also pose environmental and health risks that require mitigation such as use as a last resort for water treatment and ensuring minimum mineral standards in demineralized drinking water.
For Environment Protection against harmful emisison and aquatic life, It is necessary to implement the standard in order to control the Chemcial Oxygen demand, Biological oxygen demand, Total suspended solid, Total dissolved solid, Oil & Greece Etc.
The document summarizes water treatment processes for wastewater and drinking water. It discusses preliminary, primary, secondary, and tertiary treatment stages for wastewater, including the goals of reducing organic load and microbiological contamination. It also outlines clarification, filtration and disinfection processes for drinking water treatment, noting their aims to produce potable and palatable water. Key techniques like chlorination, ozonation, and physical disinfection methods are summarized as well.
The document discusses wastewater and sewage treatment. It describes the various stages of treatment - primary, secondary, and tertiary. Primary treatment involves physical processes like screening and sedimentation to remove solids. Secondary treatment uses biological processes via microorganisms to break down organic matter. Tertiary treatment provides additional removal of nutrients and disinfection before water is released. The goal of treatment is to remove impurities and improve water quality before it is returned to the environment.
This document provides instructions for creating an account on Google Scholar Citations. It outlines the steps to open an account including signing in with a Gmail account, providing profile information like name, affiliation and email address, adding and verifying publications, and editing the profile. It also describes features like creating alerts, understanding citation metrics, and searching for other researchers or universities.
WalkingTree is a digital services company that helps enterprises with product engineering, data analytics, and agile development using technologies like Flutter, AI/ML, and cloud services; they discuss their expertise in Flutter mobile app development including their process, solutions for industries, case studies, and reasons for choosing them for Flutter projects.
The document discusses current industrial wastewater treatment processes in the dairy industry. It begins with an overview of dairy operations and the types of wastes generated. It then describes various treatment steps including pretreatment, primary treatment using screens and settling tanks, and secondary biological treatment using activated sludge or oxidation ponds. Tertiary treatment may include coagulation, filtration and disinfection. The document also discusses some modifications to treatment processes like using membranes or organo-zeolites and issues around dairy wastewater treatment.
This is a power point presentation on design of a 30 MLD sewage treatment plant. It includes the different characteristics of waste water,various treatment units, design results and a layout of sewage treatment plant.
Visit my slide share channel for downloading report of this project.
This document discusses environmental factors related to health, with a focus on water. It covers water requirements, sources of water supply like rain, surface water and ground water. It discusses water pollution, purification methods like filtration and disinfection, and standards for drinking water quality. The goals of national water programs in India to improve access are also mentioned.
This document provides information on aquaculture environment management and water quality management. It discusses analyzing water quality parameters, understanding ideal value ranges, and using chemical treatment and mechanical control. Specific parameters like nitrogen, pH, dissolved oxygen are analyzed. Common treatments include liming to adjust pH, using alum as a coagulant, and chlorination for disinfection. Filtration through gravel or activated carbon can be used for mechanical control. The objective is to manage water quality to provide optimal growing conditions for farmed fish.
Sewage treatment is the process of removing contaminants.pptxKediromer
The document provides information about the sewage treatment process at Kombolcha Industrial Park Sewage Treatment Plant in Ethiopia. It describes the various unit processes involved, including physical processes like screening and sedimentation, biological processes like activated sludge and anaerobic digestion, and tertiary treatments like filtration. The plant has a design capacity of 2500 cubic meters per day and treats sewage to standards suitable for safe disposal or reuse.
This document discusses water pollution, purification, and disinfection. It outlines various causes and sources of water pollution including sewage, industrial waste, and agricultural runoff. It then describes common waterborne diseases and laws governing water pollution. The document provides details on large and small-scale water purification methods including storage, filtration using slow sand filters and rapid sand filters, and disinfection using chlorination. It concludes with discussing other disinfection methods like ozonation and UV light.
The typical water purification system involves storage, filtration, and disinfection. Storage allows physical, chemical, and biological purification as turbidity and bacteria are reduced over time. Filtration then removes 98-99% of remaining bacteria and other impurities using slow or rapid sand filters. The final step of disinfection, most commonly using chlorine, kills any remaining pathogens to make the water safe for human use.
Disinfection is the process of removing or killing pathogens in water. It is done to terminate the growth and reproduction of microorganisms so they pose no risk of infection. Common pathogens targeted include bacteria, viruses, protozoa and helminths. Common disinfectants used in water treatment include chlorine, chlorine dioxide, ozone, bromine, copper, silver and potassium permanganate. Disinfectants work by altering or destroying essential structures in microbes to inactivate them. Disinfection is usually one of the final steps in water purification to reduce pathogens and make drinking water safe.
The document describes new techniques for wastewater management, including filtration methods like media, membrane, and hybrid filtration systems. It also discusses disinfection systems using chlorine, ozone or UV radiation. The techniques aim to remove solid matter through various physical, chemical and biological processes like sedimentation, filtration, and the use of bacteria. Treated water and sludge can then be disposed of safely.
All living things require clean, uncontaminated water as the most crucial compound for life on Earth
Ideally, drinking water should be clear, colorless, and well aerated, with no unpalatable taste or odor, and it should contain no suspended matter, harmful chemical substances, or pathogenic microorganisms.
Wastewater discharge from industries, agricultural pollution, municipal wastewater, and poor environmental sanitation are the main sources of water contamination
The document summarizes a study being conducted by the DEP on using ribbed mussels to improve water quality in Jamaica Bay. It discusses:
1) A literature review finding ribbed mussels can filter particles and bacteria from water;
2) Microcosm experiments confirming mussels effectively filter pathogens and their filtration is only temporarily impacted by low salinity;
3) Ongoing mesocosm experiments at a larger scale to test mussel densities and responses to bacteria and freshwater pulses;
4) Plans for an in-situ pilot study deploying 75,000 mussels in Jamaica Bay to monitor their ability to naturally recruit and improve water quality.
Sewage and liquid waste management involves treating sewage through various stages. Sewage first undergoes pre-treatment which includes screening to remove large debris and grit removal to allow sand and gravel to settle. It then undergoes primary treatment which uses sedimentation to remove 50-70% of solids. Secondary treatment uses biological processes like activated sludge or trickling filters to reduce organic material using oxygen and bacteria. The treated effluent undergoes disinfection before being disposed of safely while sludge is digested and disposed of through methods like land application or sea disposal. Various treatment stages aim to purify sewage to acceptable standards before disposal.
This document provides guidelines for preventing water borne diseases through safe drinking water. It discusses how drinking contaminated water can cause over 2 million deaths annually, mostly in children in developing countries. It defines potable water and contaminated water. It classifies water borne diseases and lists examples transmitted through water, including water-borne, water-washed, water-based, and vector-borne diseases. The document then outlines the conventional water treatment process, including screening, aeration, pH correction, coagulation, sedimentation, chlorination, filtration, and disinfection. It aims to remove contaminants to make water safe for drinking.
This document outlines guidelines for preventing waterborne diseases through safe drinking water. It discusses how contaminated water can spread pathogens and cause over 2 million deaths annually, mostly in children in developing countries. Various waterborne diseases are classified based on their transmission route. The document then details conventional water treatment methods, including screening, aeration, coagulation, sedimentation, filtration, disinfection and pH adjustment to remove contaminants and make water potable.
The document provides an overview of wastewater treatment processes. It discusses the objectives of water treatment being to produce water that is safe, appealing, reasonably priced, and free of pathogens. The major operations discussed include physical processes like screening, mixing, and sedimentation as well as chemical processes like coagulation and biological processes like activated sludge. It then describes various treatment processes like primary treatment using sedimentation, pre-treatment involving screening and grit removal, and secondary/biological treatment using activated sludge or trickling filtration. Tertiary treatment methods like nutrient removal, disinfection, and filtration are also summarized. Finally, it discusses sludge treatment processes involving thickening and digestion.
Wastewater treatment by Muhammad Fahad Ansari 12IEEM14fahadansari131
Wastewater treatment involves multiple sequential processes to purify water. Physical processes like screening, sedimentation, and filtration are generally used first to remove solids. Chemical processes like coagulation, precipitation, and adsorption may then be used to remove dissolved substances. Biological treatment with microorganisms can further break down organic matter. The selection of treatment methods depends on the characteristics of the wastewater. Together, these treatment stages aim to clean wastewater to standards suitable for discharge or reuse.
Reverse osmosis desalination systems face several challenges including fouling of membranes, high energy consumption, removal of boron and fluoride, brine disposal, and solid waste generation. Solutions and developments have aimed to address these issues through improved pretreatment methods, development of new antifouling membranes, use of renewable energy sources, hybrid removal processes, and improved brine disposal and solid waste management. However, reverse osmosis systems also pose environmental and health risks that require mitigation such as use as a last resort for water treatment and ensuring minimum mineral standards in demineralized drinking water.
For Environment Protection against harmful emisison and aquatic life, It is necessary to implement the standard in order to control the Chemcial Oxygen demand, Biological oxygen demand, Total suspended solid, Total dissolved solid, Oil & Greece Etc.
The document summarizes water treatment processes for wastewater and drinking water. It discusses preliminary, primary, secondary, and tertiary treatment stages for wastewater, including the goals of reducing organic load and microbiological contamination. It also outlines clarification, filtration and disinfection processes for drinking water treatment, noting their aims to produce potable and palatable water. Key techniques like chlorination, ozonation, and physical disinfection methods are summarized as well.
The document discusses wastewater and sewage treatment. It describes the various stages of treatment - primary, secondary, and tertiary. Primary treatment involves physical processes like screening and sedimentation to remove solids. Secondary treatment uses biological processes via microorganisms to break down organic matter. Tertiary treatment provides additional removal of nutrients and disinfection before water is released. The goal of treatment is to remove impurities and improve water quality before it is returned to the environment.
This document provides instructions for creating an account on Google Scholar Citations. It outlines the steps to open an account including signing in with a Gmail account, providing profile information like name, affiliation and email address, adding and verifying publications, and editing the profile. It also describes features like creating alerts, understanding citation metrics, and searching for other researchers or universities.
WalkingTree is a digital services company that helps enterprises with product engineering, data analytics, and agile development using technologies like Flutter, AI/ML, and cloud services; they discuss their expertise in Flutter mobile app development including their process, solutions for industries, case studies, and reasons for choosing them for Flutter projects.
This document discusses various sources and types of water pollution. It describes how pollution can come from point sources like industrial facilities or nonpoint sources like agricultural runoff. Major pollutants include nutrients from fertilizers, pathogens from livestock, and toxic chemicals. Water pollution negatively impacts human health and aquatic ecosystems. Solutions discussed include improving wastewater treatment, reducing agricultural runoff, preventing oil spills, and developing sustainable water management practices.
Water sources and types are analyzed to understand water quality. There are two aspects of water analysis - physical and chemical. Physical analysis measures properties like taste, odor, color, turbidity, pH and total dissolved solids. Chemical analysis identifies substances like arsenic, lead, iron and chlorine. Hardness is caused by calcium and magnesium salts from temporary sources like bicarbonates or permanent sources like chlorides and sulfates. Understanding water sources and properties through analysis is important for determining potability and treatment needs.
The document discusses regulatory aspects of environmental pollution control in India. It outlines several key environmental laws in India like the Water Act of 1974 and Air Act of 1981 which aim to prevent and control pollution. It also discusses various Indian Standards (IS codes) for water quality and effluent discharge. The Minimum National Standards (MINAS) and implementation plans for different industries like sugar, distilleries, synthetic fibers and oil refineries are summarized. The document emphasizes reducing water usage and treating waste streams to meet stringent discharge standards.
1. 80% of the world's wastewater does not receive any treatment. Phosphorus triggers algal blooms in freshwater, while nitrogen triggers blooms in saltwater.
2. Wastewater treatment aims to reduce contaminants like suspended solids, organic material, nutrients, pathogens, chemicals and heavy metals. Treatment methods include physical, biological and chemical processes.
3. Biological processes use microorganisms to break down waste and are widely used in secondary treatment through technologies like activated sludge, trickling filters and biofilters.
X-Ray Photoelectron Spectroscopy (XPS) is a surface-sensitive technique that uses X-rays to eject electrons from the surface of a sample. An XPS instrument measures the kinetic energy of these ejected electrons to identify the elements present and the chemical and electronic states of the surface. XPS provides information only about the top 10-100 angstroms of the sample surface and requires ultra-high vacuum to prevent contamination. The technique produces characteristic peaks in spectra that can be matched to elemental binding energies to determine sample composition.
Walmart Business+ and Spark Good for Nonprofits.pdfTechSoup
"Learn about all the ways Walmart supports nonprofit organizations.
You will hear from Liz Willett, the Head of Nonprofits, and hear about what Walmart is doing to help nonprofits, including Walmart Business and Spark Good. Walmart Business+ is a new offer for nonprofits that offers discounts and also streamlines nonprofits order and expense tracking, saving time and money.
The webinar may also give some examples on how nonprofits can best leverage Walmart Business+.
The event will cover the following::
Walmart Business + (https://business.walmart.com/plus) is a new shopping experience for nonprofits, schools, and local business customers that connects an exclusive online shopping experience to stores. Benefits include free delivery and shipping, a 'Spend Analytics” feature, special discounts, deals and tax-exempt shopping.
Special TechSoup offer for a free 180 days membership, and up to $150 in discounts on eligible orders.
Spark Good (walmart.com/sparkgood) is a charitable platform that enables nonprofits to receive donations directly from customers and associates.
Answers about how you can do more with Walmart!"
How to Fix the Import Error in the Odoo 17Celine George
An import error occurs when a program fails to import a module or library, disrupting its execution. In languages like Python, this issue arises when the specified module cannot be found or accessed, hindering the program's functionality. Resolving import errors is crucial for maintaining smooth software operation and uninterrupted development processes.
The simplified electron and muon model, Oscillating Spacetime: The Foundation...RitikBhardwaj56
Discover the Simplified Electron and Muon Model: A New Wave-Based Approach to Understanding Particles delves into a groundbreaking theory that presents electrons and muons as rotating soliton waves within oscillating spacetime. Geared towards students, researchers, and science buffs, this book breaks down complex ideas into simple explanations. It covers topics such as electron waves, temporal dynamics, and the implications of this model on particle physics. With clear illustrations and easy-to-follow explanations, readers will gain a new outlook on the universe's fundamental nature.
How to Setup Warehouse & Location in Odoo 17 InventoryCeline George
In this slide, we'll explore how to set up warehouses and locations in Odoo 17 Inventory. This will help us manage our stock effectively, track inventory levels, and streamline warehouse operations.
This presentation includes basic of PCOS their pathology and treatment and also Ayurveda correlation of PCOS and Ayurvedic line of treatment mentioned in classics.
How to Manage Your Lost Opportunities in Odoo 17 CRMCeline George
Odoo 17 CRM allows us to track why we lose sales opportunities with "Lost Reasons." This helps analyze our sales process and identify areas for improvement. Here's how to configure lost reasons in Odoo 17 CRM
Main Java[All of the Base Concepts}.docxadhitya5119
This is part 1 of my Java Learning Journey. This Contains Custom methods, classes, constructors, packages, multithreading , try- catch block, finally block and more.
2. Water Sources and Water Treatment
• Drinking water should be essentially free of disease-causing microbes,
but often this is not the case.
– A large proportion of the world’s population drinks microbially contaminated water,
especially in developing countries
• Using the best possible source of water for potable water supply and
protecting it from microbial and chemical contamination is the goal
– In many places an adequate supply of pristine water or water that can be protected
from contamination is not available
• The burden of providing microbially safe drinking water supplies from
contaminated natural waters rests upon water treatment processes
– The efficiency of removal or inactivation of enteric microbes and other pathogenic
microbes in specific water treatment processes has been determined for some
microbes but not others.
– The ability of water treatment processes and systems to reduce waterborne
disease has been determined in epidemiological studies
3. Summary of Mainline Water Treatment Processes
• Storage
• Disinfection
– Physical: UV radiation, heat, membrane filters
– Chemical: Chlorine, ozone, chlorine dioxide, iodine, other
antimicrobial chemicals
• Filtration
– Rapid granular media
– Slow sand and other biological filters
– Membrane filters: micro-, ultra-, nano- and reverse osmosis
• Other physical-chemical removal processes
– Chemical coagulation, precipitation and complexation
– Adsorption: e.g., activated carbon, bone char, etc,
– Ion exchange: synthetic ion exchange resins, zeolites, etc.
4. Water Treatment Processes: Storage
Reservoirs, aquifers & other systems:
– store water
– protect it from contamination
• Factors influencing microbe reductions (site-specific)
– detention time
– temperature
– microbial activity
– water quality: particulates, dissolved solids, salinity
– sunlight
– sedimentation
– land use
– precipitation
– runoff or infiltration
5. Water Storage and Microbial Reductions
• Microbe levels reduced over time by natural
antimicrobial processes and microbial death/die-off
• Human enteric viruses in surface water reduced 400-
1,000-fold when stored 6-7 months (The Netherlands)
– Indicator bacteria reductions were less extensive,
probably due to recontamination by waterfowl.
• Protozoan cyst reductions (log10) by storage were 1.6
for Cryptosporidium and 1.9 for Giardia after about 5
months (The Netherlands; G.J Medema, Ph.D. diss.)
– Recent ICR data indicates lower protozoan levels in
reservoir or lake sources than in river sources;
suggests declines in Giardia & Cryptosporidium by
storage
7. Chemical Coagulation-Flocculation
Removes suspended particulate and colloidal substances
from water, including microorganisms.
Coagulation: colloidal destabilization
• Typically, add alum (aluminum sulfate) or ferric chloride
or sulfate to the water with rapid mixing and controlled
pH conditions
• Insoluble aluminum or ferric hydroxide and aluminum
or iron hydroxo complexes form
• These complexes entrap and adsorb suspended
particulate and colloidal material.
8. Coagulation-Flocculation, Continued
Flocculation:
• Slow mixing (flocculation) that provides for for a period
of time to promote the aggregation and growth of the
insoluble particles (flocs).
• The particles collide, stick together abd grow larger
• The resulting large floc particles are subsequently
removed by gravity sedimentation (or direct filtration)
• Smaller floc particles are too small to settle and are
removed by filtration
9. Microbe Reductions by Chemical Coagulation-
Flocculation
• Considerable reductions of enteric microbe concentrations.
• Reductions In laboratory and pilot scale field studies:
– >99 percent using alum or ferric salts as coagulants
– Some studies report much lower removal efficiencies (<90%)
– Conflicting information may be related to process control
• coagulant concentration, pH and mixing speed during
flocculation.
• Expected microbe reductions bof 90-99%, if critical process
variables are adequately controlled
• No microbe inactivation by alum or iron coagulation
– Infectious microbes remain in the chemical floc
– The floc removed by settling and/or filtration must be properly
managed to prevent pathogen exposure.
• Recycling back through the plant is undesirable
• Filter backwash must be disinfected/disposed of properly.
10. Cryptosporidium Removals by Coagulation
(Jar Test Studies)
Coagulant Dose
(mg/L)
Oocyst Removal, % (log10)
Alum 5
1
99.8 (2.7)
87 (0.9)
Iron 6
5
99.5 (2.3)
97 (1.5)
11. Granular Media Filtration
• Used to remove suspended particles (turbidity) incl. microbes.
• Historically, two types of granular media filters:
– Slow sand filters: uniform bed of sand;
– low flow rate <0.1 GPM/ft2
– biological process: 1-2 cm “slime” layer (schmutzdecke)
– Rapid sand filters: 1, 2 or 3 layers of sand/other media;
– >1 GPM/ft2
– physical-chemical process; depth filtration
• Diatomaceous earth filters
– fossilized skeletons of diatoms (crystalline silicate);
powdery deposit; few 10s of micrometers; porous
12. Slow Sand Filters
• Less widely used for large US municipal water supplies
• Effective; widely used in Europe; small water supplies;
developing countries
• Filter through a 3- to 5-foot deep bed of unstratified sand
• flow rate ~0.05 gallons per minute per square foot.
• Biological growth develops in the upper surface of the sand is
primarily responsible for particle and microbe removal.
• Effective without pretreatment of the water by
coagulation-flocculation
• Periodically clean by removing, cleaning and replacing the
upper few inches of biologically active sand
13. Microbial Reductions by Slow Sand Filtration
• Effective in removing enteric microbes from water.
• Virus removals >99% in lab models of slow sand filters.
– Up to 4 log10; no infectious viruses recovered from filter effluents
• Field studies:
– naturally occurring enteric viruses removals
• 97 to >99.8 percent; average 98% overall;
• Comparable removals of E. coli bacteria.
– Virus removals=99-99.9%;
– high bacteria removals (UK study)
• Parasite removals: Giardia lamblia cysts effectively removed
– Expected removals 99%
14.
15. Roughing Filter
•Used in developing
countries
•inexpensive
•low
maintenance
•local materials
•Remove large solids
•Remove microbes
•1-2 log10
bacterial
reduction
•90% turbidity
reduction
16. Microbe Reductions by Rapid Granular Media Filters
• Ineffective to remove enteric microbes unless preceded by
chemical coagulation-flocculation.
• Preceded chemical coagulation-flocculation & sedimentation
• Enteric microbe removals of 90->99 % achieved.
• Field (pilot) studies: rapid sand filtration preceded by iron
coagulation-flocculation: virus removal <50% (poor control?).
• Giardia lamblia: removals not always high; related to turbidity
removal; >99% removals reported when optimized.
– Removal not high unless turbidity is reduced to 0.2
NTU.
• Lowest removals shortly after filter backwashing
– Microbes primarily removed in filter by entrapped floc
particles.
• Overall, can achieve 90% microbial removals from water
when preceded by chemical coagulation-flocculation.
17. Microbe Reductions by Chemical Coagulation-Flocculation and
Filtration of River Water by Three Rx Plants in The Netherlands
Organisms Plant 1 Plant 2 Plant 3
Log10 Reductions of Microbes
Enteric
Viruses
1.0 1.7 >2
F+
Coliphages
0.4 1.7 No data
Fecal
Coliforms
0.2 2.0 >2
Fecal
Streptococci
0.6 2.1 >2
Clostridium
spores
0.6 2.1 >2
Plant 1 used two stages of iron coagulation-flocculation-sedimentation.
Plant 2 used iron coagulation-flocculation-sedimentation and rapid filtration
Plant 3 used iron coagulation-flotation-rapid filtration.
18. Cryptosporidium Removals by Sand
Filtration
Type Rate (M/hr) Coagulation
Reduction
% (log10)
Rapid, shallow 5 No 65 (0.5)
Rapid, shallow 5 Yes 90 (1.0)
Rapid, deep 6 Yes 99.999 (5.0)
Slow 0.2 No 99.8 (2.7)
19. Cryptosporidium Removal by Coagulation and Direct
Filtration
Run No.
Log10 Reduction of
Cryptosporidium Turbidity
1 3.1 1.3
2 2.8 1.2
3 2.7 0.7
4 1.5 0.2*
Mean 2.5 0.85
Raw water turbidity = 0.0 - 5.0 NTU
Alum coagulation-flocculation;
Anthracite-sand-sand filtration; 5 GPM/ft2
*Suboptimum alum dose
Ongerth & Pecoraro. JAWWA, Dec., 1995
20. Reported Removals of Cryptosporidium
Oocysts by Physical-Chemical Water
Treatment Processes (Bench, Pilot and
Field Studies)
Process Log10 Reduction
Clarification by:
Coagulation flocculation-sedimentation
or Flotation
Rapid Filtration (pre-coagulated)
Both Processes
<1 - 2.6
1.5 - >4.0
<2.5 - >6.6
Slow Sand Filtration >3.7
Diatomaceous Earth Filtration >4.0
Coagulation + Microfiltration >6.0
Ultrafiltration >6.0
21. Cryptosporidium Reductions by Coagulation
and Filtration
Laboratory studies on oocyst removal:
- Jar test coagulation with 1 hr. setting =
2.0 - 2.7 log10
- Sand filtration, no coagulant, 10 cm bed
depth = 0.45 log10
- Sand filtration, plus coagulation, 10 cm bed
depth = 1.0 log10
Gregory et al., 1991. Final Report. Dept. of the Environ., UK
22. Membrane Filters
• More recent development and use in drinking water
• Microfilters: several tenths of M to M diameter pore size
– nano- & ultra-filters: retention by molecular weight cutoff
• Typically 1,000-100,000 MWCO
• Reverse osmosis filters: pore size small enough to remove
dissolved salts; used to desalinate (desalt) water as well as
particle removal
• High >99.99% removal of cellular microbes
• Virus removals high >9.99% in ultra-, nano- and RO filters
• Virus removals lower (99%) by microfilters
• Membrane and membrane seal integrity critical to effective
performance
24. Adsorbers and Filter-Adsorbers
Adsorbers:
• Granular activated carbon adsorption
– remove dissolved organics
– poor retention of pathogens, esp. viruses
– biologically active; develops a biofilm
– can shed microbes into water
Filter-adsorbers
• Sand plus granular activated carbon
– reduces particles and organics
– biologically active
– microbial retention is possible
25. Cryptosporidium Removals by Sand
Filtration
Type Rate (M/hr) Coagulation
Reduction
% (log10)
Rapid, shallow 5 No 65 (0.5)
Rapid, shallow 5 Yes 90 (1.0)
Rapid, deep 6 Yes 99.999 (5.0)
Slow 0.2 No 99.8 (2.7)
27. Water Softening and Microbe Reductions
• ”Hard" Water: contains excessive amounts of calcium
and magnesium ions
– iron and manganese can also contribute to hardness.
• Hardness ions are removed by adding lime (CaO) and
sometimes soda ash (Na2CO3) to precipitate them as
carbonates, hydroxides and oxides.
• This process, called softening, is basically a type of
coagulation-flocculation process.
• Microbe reductions similar to alum and iron
coagulation when pH is <10
• Microbe reductions >99.99% possible when pH is >11
– microbial inactivation + physical removal
28. Microbial Reductions by Softening Treatment
• Softening with lime only (straight lime softening); moderate
high pH
– ineffective enteric microbe reductions: about 75%.
• Lime-soda ash softening
– results in the removal of magnesium as well as calcium
hardness at higher pH levels (pH >11)
– enteric microbe reductions >99%.
– Lime-soda ash softening at pH 10.4, 10.8 and 11.2 has produced
virus reductions of 99.6, 99.9 and 99.993 percent, respectively.
• At lower pH levels (pH <11), microbe removal is mainly a
physical process
– infectious microbes accumulate in the floc particles and the
resulting chemical sludge.
• At pH levels above 11, enteric microbes are physically
removed and infectivity is also destroyed
– more rapid and extensive microbe inactivation at higher pH
levels.
29. Disinfection of Microbes in Water:
Conventional Methods used in the Developed World
• Historically, the essential barrier to prevention and control of waterborne
microbial transmission and waterborne disease.
• Free chlorine: HOCl (hypochlorous) acid and OCl- (hypochlorite ion)
– HOCl at lower pH and OCl- at higher pH; HOCl a more potent germicide than OCl-
– strong oxidant and relatively stable in water (provides a disinfectant residual)
• Chloramines: mostly NH3Cl: weak oxidant; provides a stable residual
• ozone, O3 , strong oxidant; provides no residual (too volatile and
reactive)
• Chlorine dioxide, ClO2,, string oxidant but not very stable residual
• Concerns due to health risks of chemical disinfectants and their
by-products (DBPs), especially free chlorine and its DBPs
• UV radiation
– low pressure mercury lamp: low intensity; monochromatic at 254 nm
– medium pressure mercury lamp: higher intensity; polychromatic 220-280 nm)
– reacts primarily with nucleic acids: pyrimidine dimers and other alterations
30. Disinfection Kinetics
• Disinfection is a kinetic process
• Increased inactivation with increased exposure or contact time.
– Chick's Law: disinfection is a first-order reaction. (NOT!)
– Multihit-hit or concave up kinetics: initial slow rate; multiple targets to be
“hit”
– Concave down or retardant kinetics: initial fast rate; decreases over time
• Different susceptibilities of microbes to inactivation; heterogeneous
population
• Decline of of disinfectant concentration over time
• CT Concept: Disinfection can be expressed at the product of disinfectant
concentration X contact time
– Applies best when disinfection kinetics are first order
• Disinfectant concentration and contact time have an equal effect on
CT products
• Applies less well when either time ofrconcentration is more important.
32. Factors Influencing Disinfection of Microbes
• Microbe type: disinfection resistance from least to most:
vegetative bacteria viruses protozoan cysts, spores and eggs
• Type of disinfectant: order of efficacy against Giardia from best to worst
– O3 ClO2 iodine/free chlorine chloramines
– BUT, order of effectiveness varies with type of microbe
• Microbial aggregation:
– protects microbes from inactivation
– microbes within aggregates can not be readily reached by the disinfectant
33. Effects of Water Quality on Disinfection
• Particulates: protect microbes from inactivation
– microbes shielded or embedded in particles
• Dissolved organics: protects
– consumes or absorbs (UV radiation) disinfectant
– coats microbes
• Inorganic compounds and ions: effects vary with disinfectant
• pH: effects depend on disinfectant.
– Free chlorine more biocidal at low pH where HOCl predominates.
– Chlorine dioxide more microbiocidal at high pH
• Reactor design, mixing and hydraulic conditions; better activity in
"plug flow" than in "batch-mixed" reactors.
34. Inactivation of Cryptosporidium Oocysts in
Water by Chemical Disinfectants
Disinfectant CT99 (mg-min/L) Reference
Free Chlorine 7,200+ Korich et al., 1990
Monochloramine 7,200+ Korich et al., 1990
Chlorine Dioxide >78 Korich et al., 1990
Mixed oxidants <120 Venczel et al., 1997
Ozone ~3-18 Finch et al., 1994
Korich et al., 1990
Owens et al., 1994
C. parvum oocysts inactivated by low doses of UV radiation: <10 mJoules/cm2
35. Disinfection:
A Key Barrier Against Microbes in Water
• Free chlorine still the most commonly used disinfectant
• Maintaining disinfectant residual during treated water storage
and distribution is essential.
– A problem for O3 and ClO2, which do not remain in water for very long.
– A secondary disinfectant must be used to provide a stable residual
• UV radiation is a promising disinfectant because it inactivates
Cryptosporidium at low doses
– UV may have to be used with a chemical disinfectant to protect the
water with a residual through distribution and storage