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Ultraviolet Disinfection: A General Overview
National Environmental Services Center

This fact sheet provides an overview of ultraviolet disinfection of wastewater.

WWFSGN98DL/Fact Sheet: 2 pp. (1998)

Price: $0.00
 
Wadeable Streams Assessment: A Collaborative Survey of the Nations Streams
U.S. Environmental Protection Agency, Office of Research and Development,Office of Water

The EPA's Wadeable Streams Assessment provides the first statistically-accurate summary of the condition of our streams and small rivers. Data was collected from 1,392 perennial streams to determine the biological condition of these waters and the primary threats to their quality. This book describes this study and presents the data in tables, charts and text with many accompanying full-color photographs.

WWBKGN280DL/Book: 113 pp. (2006)

Price: $0.00


 
Waste Water Justice? Its Complexion in Small Places
U.S. Environmental Protection Agency, Office of Wastewater Management

This booklet examines how justly communities are treated when it comes to wastewater services. Twelve small communities were chosen for this study; 10 with known wastewater problems, and two without. The booklet presents lessons learned from surveying these communities and discusses how to use these lessons to develop new policies and work more effectively with small communities.

WWBLGN94DL/Booklet: 29 pp. (1997)

Price: $0.00
 
Wastewater Technology Fact Sheet Wetlands: Subsurface Flow
U.S. Environmental Protection Agency, Office of Water

This fact sheet describes two types of constructed wetlands-subsurface flow and free water surface- highlighting the characteristics, design criteria, advantages and disadvantages, applicability, performance, operation and maintenance, and costs. A diagram of the subsurface flow wetland illustrates its components. Tables include:

• typical areal loading rates,

• 'background' concentrations,

• typical media characteristics,

• summary of performance for 14 subsurface flow wetland systems,

• capital and operation and maintenance costs for a 100,000 gallons per day subsurface flow wetland, and

• cost comparison of subsurface flow wetland and conventional wastewater treatment.

WWFSGN181DL/Fact Sheet: 9 pp. (2000)

Price: $0.00


 
Wastewater Technology Fact Sheet: Aerated, Partial Mix Lagoons
U.S. Environmental Protection Agnecy, Office of Water

Partial mix lagoons are commonly used to treat municipal and industrial wastewaters. This technology has been widely used in the United States for at least 40 years. This fact sheet describes a partial mix lagoon and includes information on its applicability, advantages and disadvantages, design criteria, performance, operaiton and maintenance, and system cost .

WWFSGN235DL/Fact Sheet: 5 pp. (2002)

Price: $0.00
 
Wastewater Technology Fact Sheet: Ammonia Stripping
U.S. Environmental Protection Agency, Office of Water

This fact sheet describes the process of ammonia stripping. The process is a simple desorption procedure that lowers the content of ammonia in a wastewater stream. This fact sheeet discusses the advantages and disadvantages of the procedure, basic design, and operation and maintenance criteria.

WWFSGN226DL/Fact Sheet: 4 pp. (2000)

Price: $0.00


 
Wastewater Technology Fact Sheet: Anaerobic Lagoons
U.S. Environmental Protection Agnecy, Office of Water

An anaerobic lagoon is a deep impoundment, essentially free of dissolved oxygen, that promotes anaerobic conditions. The process typically takes place in deep earthen basins, and such ponds are used as anaerobic pretreatment systems. Anaerobic lagoons are typically used for two major purposes: 1) Pretreatment of high strength industrial wastewaters. 2) Pretreatment of municipal wastewater to allow preliminary sedimentation of suspended solids as a pretreatment process. This fact sheet discusses general design guidelines, and operaiton and maintenance requirements.

WWFSGN225DL/Fact Sheet: 6 pp. (2002)

Price: $0.00
 
Wastewater Technology Fact Sheet: Bacterial Source Tracking
U.S. Environmental Protection Agnecy, Office of Water

Pathogens are a major pollutant of water bodies nationwide according to many states Clean Water Act 303(d) reports. Potential sources of fecal bacteria are generally grouped into three major categories: human, livestock, or wildlife. In more urban watersheds, a fourth category of pets or dogs may be added. Bacterial Source Tracking (BST) is a methodology used to determine the source of fecal pathogen contamination in environmental samples. This fact sheet discusses Molecular and non-molecular BST methods along with several case studies to demonstrate the use of various BST methods. General cost ranges are also provided.

WWFSGN229DL/Fact Sheet: 12 pp. (2002)

Price: $0.00


 
Wastewater Technology Fact Sheet: Chemical Precipitation
U.S. Environmental Protection Agency, Office of Water

Chemical precipitation is a widely used, proven technology for removing metals, suspended solids, fats, oils, greases, and other organic and inorganic substances from wastewater. This fact sheet describes chemical precipitation and how it works. Applicability, advantages and disadvantages, design criteria, performance, operation and maintenance, and costs are discussed. The fact sheet includes a flow diagram of a chemical feed system. Data tables summarize chemicals used in wastewater treatment, ommercial forms of chemical precipitation chemicals, and types of feed mechanisms within volumetric and gravimetric feeders.

WWFSGN191DL/Fact Sheet: 8 pp. (2000)

Price: $0.00
 
Wastewater Technology Fact Sheet: Chlorine Disinfection
U.S. Environmental Protection Agency, Office of Water

Chlorine is the most widely used disinfectant for municipal wastewater because it destroys target organisms by oxidizing cellular material. This fact sheet describes the process of chlorine disinfection, its applicability, advantages and disadvantages, design criteria, performance, operation and maintenance, and costs. A diagram of a compound-loop control system for chlorination is included, along with three data tables listing infectious agents potentially present in untreated domestic wastewater, wastewater characteristics affecting chlorination performance, and the estimated total annual cost for chlorination/dechlorination.

WWFSGN189DL/Fact Sheet: 7 pp. (1999)

Price: $0.00


 
Wastewater Technology Fact Sheet: Dechlorination
U.S. Environmental Protection Agency, Office of Water

This fact sheet describes the process of chlorine disinfection, its applicability, advantages and disadvantages, design criteria, performance, operation and maintenance, and costs. A diagram of a compound-loop control system for chlorination is included, along with three data tables listing infectious agents potentially present in untreated domestic wastewater, wastewater characteristics affecting chlorination performance, and the estimated total annual cost for chlorination/dechlorination

WWFSGN188DL/Fact Sheet: 7 pp. (2000)

Price: $0.00
 
Wastewater Technology Fact Sheet: Facultative Lagoons
U.S. Environmental Protection Agnecy, Office of Water

Facultative waste stabilization ponds, sometimes referred to as lagoons or ponds, are frequently used to treat municipal and industrial wastewater in the U. S. The technology associated with facultative lagoons has been in widespread use in the U.S. for at least 90 years, with more than 7,000 facultative lagoons in operation today. Although the facultative lagoon concept is land intensive, it is a reliable and easy-to-operate process that is attractive to small, rural communities. This fact sheet discusses basic design, operaiton, and performance information concerning facultative lagoons.

WWFSGN231DL/Fact Sheet: 4 pp. (2002)

Price: $0.00


 
Wastewater Technology Fact Sheet: Fine Bubble Aeration
U.S. Environmental Protection Agency, Office of Water

The two most common aeration systems are subsurface and mechanical. This fact sheet concentrates on the use of fine bubble diffusion as a form of subsurface aeration. The applicability of fine bubble aeration is illustrated in three case studies from Wisconsin, Washington, and New Jersey. The fact sheet includes advantages and disadvantages, design criteria for different types of diffusers, performance of diffused aeration systems, operation and maintenance, and costs.

WWFSGN187DL/Fact Sheet: 7 pp. (1999)

Price: $0.00
 
Wastewater Technology Fact Sheet: Free Water Surface Wetlands
U.S. Environmental Protection Agency, Office of Water

Free water surface (FWS) wetlands are defined as wetland systems where the water surface is exposed to the atmosphere. This fact sheet describes the FWS system and its construction, vegetation, treatment processes, and common modifications. Applicability, advantages and disadvantages, design criteria, performance, operation and maintenance, and costs are discussed. The FWS wetland is illustrated, and data tables provide areal loading rates, 'background' FWS wetland concentrations, a performance summary for 27 FWS wetland systems, capital and operation and maintenance costs for a 100,000 gallons per day FWS wetland, and a cost comparison of FWS wetland and conventional wastewater treatment.

WWFSGN182DL/Fact Sheet: 8 pp. (2000)

Price: $0.00


 
Wastewater Technology Fact Sheet: High-Efficiency Toilets
U.S. Environmental Protection Agency, Office of Water

In 1992, Congress passed legislation requiring that all toilets sold in the U.S. meet a new water conservation standard of 1.6 gallons per flush. A number of metropolitan regions and 17 states had instituted water conservation programs, which included high-efficiency toilet requirements. A national water use standard for a high-efficiency toilet was needed to address the problems with different states and communities having different toilet water use standards. This fact sheet answers questions that a consumer, property manager, plumbing contractor, and utility manager might have about the high-efficiency toilet standards. The fact sheet summarizes environmental, public, and consumer benefits, and describes the technology, high-efficiency toilet performance, limitations, consumer tips, and costs.

WWFSGN190DL/Fact Sheet: 5 pp. (2000)

Price: $0.00
 
Wastewater Technology Fact Sheet: In-Plant Pump Stations
U.S. Environmental Protection Agency, Office of Water

This fact sheet describes in-plant pump stations, their applicability, advantages and disadvantages, design criteria, performance, operation and maintenance, and costs. The types of pumps most commonly used at wastewater treatment plants include the centrifugal, progressive cavity, and positive displacement. These three types are listed in a table with the different pump applications. Figures include the dry-well pump, wet-well pump, centrifugal angle-flow pump, and a pump performance curve.

WWFSGN186DL/Fact Sheet: 9 pp. (2000)

Price: $0.00


 
Wastewater Technology Fact Sheet: Intermittent Sand Filters
U.S. Environmental Protection Agency, Office of Water

This fact sheet describes intermittent sand filters (ISFs), including gravity discharge, pumped discharge, and bottomless sand filters. Advantages and disadvantages, performance, and operation and maintenance (O&M) are discussed. Two case studies illustrate applicability. Tables show typical design criteria, recommended O&M, and effluent comparison from single-family, residential septic tanks and ISFs in Placer County, California; and Boone County, Missouri.

WWFSGN183DL/Fact Sheet: 7 pp. (1999)

Price: $0.00
 
Wastewater Technology Fact Sheet: Oxidation Ditches
U.S. Environmental Protection Agency, Office of Water

An oxidation ditch is a modified activated sludge biological treatment process that uses long solids retention times (SRTs) to remove biodegradable organics. This fact sheet describes the oxidation ditch, its biological processes, applicability, advantages and disadvantages, design criteria, performance, operation and maintenance, and costs. The fact sheet includes two figures: a typical oxidation ditch activated sludge system, and the modified Ludzack-Ettinger process one of the most common design modifications for enhanced nitrogen removal. Data tables summarize the performance of two recently designed oxidation ditch facilities in Casa Grande, Arizona; and Edgarton, Massachusetts.

WWFSGN195DL/Fact Sheet: 6 pp. (2000)

Price: $0.00


 
Wastewater Technology Fact Sheet: Ozone Disinfection
U.S. Environmental Protection Agency, Office of Water

This fact sheet describes ozone and how it disinfects wastewater. It includes tables of infectious agents potentially present in untreated domestic wastewater and typical cost estimates of an ozone disinfection, including capital, unit, and annual operation and maintenance costs. A schematic diagram illustrates the ozonation process. Applicability, advantages and disadvantages of ozone disinfection, performance, and operation and maintenance are explained.

WWFSGN180DL/Fact Sheet: 7 pp. (1999)

Price: $0.00
 
Wastewater Technology Fact Sheet: Package Plants
U.S. Environmental Protection Agency, Office of Water

Package plants are pre-manufactured wastewater treatment facilities used in small communities or on individual properties. This fact sheet focuses on three types of package plants, all of which are biological aeration processes:

• extended aeration plants,

• sequencing batch reactors (SBRs), and

• oxidation ditches.

Their applicability, advantages and disadvantages, design criteria, performance, operation and maintenance, and costs are outlined. Data tables summarize the typical design parameters for package plants; extended aeration performance; SBR and oxidation ditch performance; and cost estimates for extended aeration, SBRs, and oxidation ditches.

WWFSGN194DL/Fact Sheet: 12 pp. (2000)

Price: $0.00


 
Wastewater Technology Fact Sheet: Pipe Construction and Materials
U.S. Environmental Protection Agency, Office of Water

There are several different pipe materials available for wastewater collection systems, each with a unique characteristic used for different conditions. The four pipe materials described in this fact sheet are ductile iron, concrete, plastic, and vitrified clay. The fact sheet discusses the application of various pipe materials, advantages and disadvantages, design criteria, and costs. The fact sheet includes tables of different materials' advantages and disadvantages and the average cost per linear foot by pipe diameter.

WWFSGN184DL/Fact Sheet: 5 pp. (2000)

Price: $0.00
 
Wastewater Technology Fact Sheet: Rapid Infiltration Land Treatment
U.S. Environmental Protection Agnecy, Office of Water

This fact sheet discusses the use of rapid infiltration land treatment as a wastewater treatment technology. Topics covered include applicability, advantages and disadvantages, design criteria, performance, operation and maintenance, and costs.

WWFSGN230DL/Fact Sheet: 6 pp. (2003)

Price: $0.00


 
Wastewater Technology Fact Sheet: Rock Media Polishing Filter for Lagoons
U.S. Environmental Protection Agnecy, Office of Water

Rock filters are often used to remove algae from lagoon effluents. This fact sheet discusses common rock filter configurations and technology applications; advantages and disadvantages of using rock filters; and performance results of various studies to determine of rock filters can consistently meet 30/30 mg/l BOD/TSS discharge standards.

WWFSGN228DL/Fact Sheet: 4 pp. (2002)

Price: $0.00
 
Wastewater Technology Fact Sheet: Screening and Grit Removal
U.S. Environmental Protection Agency, Office of Water

Wastewater contains solids and grit that can interfere with treatment processes or cause undue mechanical wear. Preliminary treatment removes these constituents from the influent wastewater. This fact sheet discusses screening and grit removal from wastewater treatment equipment, including the cost of removal and references to other related fact sheets.

WWFSGN256DL/Fact Sheet: 11 pp. (2003)

Price: $0.00


 
Wastewater Technology Fact Sheet: Sequencing Batch Reactors
U.S. Environmental Protection Agency, Office of Water

The sequencing batch reactor (SBR) is a fill-and-draw activated sludge system for wastewater treatment. SBRs are uniquely suited for wastewater treatment applications with low- or intermittent-flow conditions. This fact sheet describes the SBR and a wastewater treatment plant using an SBR. Applicability, advantages and disadvantages, design criteria, performance, operation and maintenance, and costs are discussed. The fact sheet includes a process flow diagram for a typical SBR and data tables listing:

• key design parameters,

• case studies for SBR installations,

• equipment costs for different projects,

• budget level equipment costs based on flow rates,

• and installed cost per gallon of wastewater treated.

WWFSGN179DL/Fact Sheet: 9 pp. (1999)

Price: $0.00
 
Wastewater Technology Fact Sheet: Sewers, Force Main
U.S. Environmental Protection Agency, Office of Water

Force mains are pipelines that convey wastewater under pressure from the discharge side of a pump or pneumatic ejector to a discharge point. This fact sheet describes the principles of force mains and their common modifications. Their applicability, advantages and disadvantages, design criteria, performance, operation and maintenance, and costs are discussed. Data tables summarize the characteristics of common force main pipe materials, force main capacity, constuction costs for ductile iron and plastic pipes, and force main constuction costs.

WWFSGN185DL/Fact Sheet: 8 pp. (2000)

Price: $0.00


 
Wastewater Technology Fact Sheet: Sewers, Pressure
U.S. Environmental Protection Agency, Office of Water

This wastewater technology fact sheet discusses the septic tank effluent pump, (STEP) and grinder pump systems. Both systems use pressure to deliver sewage to a larger treatment system. The fact sheet discusses the applicability, advantages and disadvantages, design criteria, operation and maintenance, cost, and references for each type of system.

WWFSGN223DL/Fact Sheet: 9 pp. (2002)

Price: $0.00
 
Wastewater Technology Fact Sheet: Slow Rate Land Treatment
U.S. Environmental Protection Agency, Office of Water

Slow rate land treatment is one of the oldest and most widely used forms of land treatment. Slow rate systems can produce a very high quality percolate but also require the largest land area compared to other treatment concepts. This fact sheet offers a description, applicability, advantages and disadvantages, design criteria, performance, operation and maintenance, costs, and references for slow rate land treatment.

WWFSGN222DL/Fact Sheet: 5 pp. (2002)

Price: $0.00


 
Wastewater Technology Fact Sheet: The Living Machine
U.S. Environmental Protection Agnecy, Office of Water

This fact sheet focuses on The Living Machineฎ as an emerging wastewater treatment technology that utilizes a series of tanks, which support vegetation and a variety of other organisms. The Living Machineฎ gets its name from the ecologically-based components that are incorporated within its treatment processes (microorganisms, protozoa, higher animals such as snails, and plants). The wastewater treatment technology has sometimes been referred to as the Advanced Ecologically Engineered System or AEES.

WWFSGN224DL/Fact Sheet: 7 pp. (2002)

Price: $0.00
 
Wastewater Technology Fact Sheet: Trickling Filter Nitrification
U.S. Environmental Protection Agency, Office of Water

Nitrogen is one of the principal nutrients found in wastewater. Discharges containing nitrogen can severely damage a water resource and its associated ecosystem. Of two suggested processes that significantly reduce nitrogen levels in wastewater-nitrification and denitrification—this fact sheet focuses on the nitrification process using the trickling filter (TF) system. The fact sheet describes the nitrification process, advantages and disadvantages of TFs, their design criteria, performance, operation and maintenance, and costs.

WWFSGN192DL/Fact Sheet: 9 pp. (2000)

Price: $0.00


 
Wastewater Technology Fact Sheet: Trickling Filters
U.S. Environmental Protection Agency, Office of Water

The trickling filter (TF) is an aerobic treatment system that uses microorganisms attached to a medium to remove organic matter from wastewater. TFs are known as attached-growth processes and are common to a number of technologies, such as rotating biological contractors. This fact sheet describes TFs and the biological process they use. The fact sheet discusses advantages and disadvantages, performance, operation and maintenance, and cost, and design criteria, including the basic categories of filter design.

WWFSGN193DL/Fact Sheet: 7 pp. (2000)

Price: $0.00
 
Wastewater Technology Fact Sheet: Ultraviolet Disinfection
U.S. Environmental Protection Agency, Office of Water

Disinfection is the primary way to inactivate pathogenic organisms and prevent the spread of waterborne diseases to downstream users. This fact sheet explains what UV disinfection is, how it works, and the components of UV disinfection system. Tables list infectious agents potentially present in untreated domestic wastewater (i.e., bacteria, protozoa, and viruses) and wastewater characteristics affecting UV disinfection systems. The fact sheet summarizes advantages and disadvantages of UV disinfection, its applicability, performance, operation and maintenance, and cost.

WWFSGN199DL/Fact Sheet: 7 pp. (1999)

Price: $0.00


 
Wastewater Treatment Programs Serving Small Communities
U.S. Environmental Protection Agency, Office of Wastewater Management

This fact sheet highlights EPA-funded programs that provide financial assistance, technical assistance, and training to small communities to construct and operate wastewater treatment facilities. Some of the programs include:

• Alaskan Native Villages Sanitation Grant Program

• Clean Water Tribal Grant Program

• Colonias Program

• Operator Onsite Technical Assistance Program 104(g)

• Small Communities Outreach and Education Network

Contact information and hotlines for wastewater treatment are also included.

WWFSGN157DL/Fact Sheet: 2 pp. (2002)

Price: $0.00
 
Water Efficiency Technology Fact Sheet: Oil Recirculating Toilets
U.S. Environmental Protection Agency, Office of Water

Although not widely used in the U.S., oil recirculating toilets are 'non-water carriage' toilets, meaning they do not require water to operate. Instead, human wastes are deposited into mineral oil, or another similarly non-aqueous medium, and later disposed of at an approved facility. This fact sheet summarizes the applicability of these toilets and situations where they might be an option. The fact sheet discusses advantages and disadvantages, design criteria, performance in specific cases, operation and maintenance, and costs. The primary components of a typical mineral oil recirculating toilet system are illustrated.

WWFSGN198DL/Fact Sheet: 4 pp. (2000)

Price: $0.00


 
Water Efficiency Technology Fact Sheet: Composting Toilets
U.S. Environmental Protection Agency, Office of Water

Originally commercialized in Sweden, a composting (or biological) toilet system processes excrement, toilet paper, carbon additive, and sometimes, food waste. This fact sheet discusses the composting toilet system and its applicability, including replacement, rejuvenation, and remodeling of existing disposal systems. The fact sheet details advantages and disadvantages, performance, operation and maintenance, cost, design criteria, and additional sources of information.

WWFSGN196DL/Fact Sheet: 7 pp. (1999)

Price: $0.00
 
Water Efficiency Technology Fact Sheet: Incinerating Toilets
U.S. Environmental Protection Agency, Office of Water

Incinerating toilets are self-contained units consisting of a traditional commode-type seat connected to a holding tank and a gas-fired or electric heating system. The incineration products are primarily water and a fine, non-hazardous ash that can be disposed of easily and without infection hazard. This fact sheet discusses the applicability of incinerating toilets, their advantages and disadvantages, design criteria for electric and gas-fired incinerating toilets, performance using case studies, operation and maintenance, and costs.

WWFSGN197DL/Fact Sheet: 5 pp. (1999)

Price: $0.00


 
Water Efficiency: A General Overview
National Environmental Services Center

This fact sheet provides an overview of efficient water use and describes various conservation options that can exist to extend the life of wastewater systems.

WWFSGN111DL/Fact Sheet: 2 pp. (1998)

Price: $0.00
 
Watershed Protection Approach: An Overview
U.S. Environmental Protection Agency, Office of Water

This booklet describes efforts within the EPA and other state, federal, and local agencies to refocus existing water pollution control programs to operate in a more comprehensive and coordinated manner. The booklet highlights several watershed protection projects throughout the U.S. at various levels of involvement with government agencies.

GNBLGN03DL/Booklet: 12pp. (1991)

Price: $0.00


 
Watershed Protection: A Statewide Approach
U.S. Environmental Protection Agency, Office of Water

This book is a guide to watershed protection designed for state water quality managers. It also serves as a resource for others involved in watershed-based activities as they adopt, implement, and evaluate watershed protection programs. The book discusses the premise of the watershed protection approach that many water quality and ecosystem problems are best solved at the watershed level rather than the individual waterbody or discharger level.

GNBKGN14DL/Book: 63 pp. (1995)

Price: $0.00
 
Watershed-Based National Pollutant Discharge Elimination System (NPDES) Permitting Implementation Guidance
U.S. Environmental Protection Agency

This guidance manual provides an overview of watershed-based permitting and describes the process used in the NPDES permit system. The manual is divided into four sections: (1) background information about watershed-based permitting, (2) a recommended process for this permitting, (3) benefits and challenges inherent in this approach, and (4) a collection of resources and references for additional information.

WWBKGN265DL/Book: 93 pp. (2003)

Price: $0.00


 
Why Do Septic Systems Malfunction?
The Ohio State University, Extension

This fact sheet discusses the signs of septic system malfunction and makes a distinction between malfunction and failure (i.e., failure is when a system cannot be fixed to bring it back into compliance). Three reasons for system failure are noted, along with ways the property owner can avoid system failure. This fact sheet could be a good tool for community or public education.

WWFSGN205DL/Fact Sheet: 2 pp. (2000)

Price: $0.00
 

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