Author: L. E. Liem
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 52
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Book Description
Provides a literature review of the current state of knowledge in the area of inorganic chemical removal from drinking water. The review considers inorganic chemical parameters that include arsenic, barium, boron, cadmium, chloride, chromium, copper, cyanide, fluoride, iron, lead, manganese, mercury, nitrate, selenium, sodium, sulphide, total dissolved solids, uranium, and zinc. Sources of inorganic chemicals include industrial and municipal effluent, agricultural runoff, and natural sources. Both conventional and advance treatment processes are noted to give an idea of how each contaminant could be removed. These processes include coagulation, softening, filtration, oxidation, adsorption, ion exchange, distillation, membrane processes, aeration, and dilution.
Author: Hongde Zhou
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 102
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Book Description
This report reviews the various water treatment technologies available to remove micro-organisms from raw water supplies. Discussions of each technology includes a process overview, performance information, design considerations, operating and maintenance aspects, and notes on costs and status of technology development. In addition, the impacts of important micro-organisms and relevant regulations are examined to highlight the significance and requirements of removing micro-organisms from water treatment processes. Specific consideration is made regarding those technologies suitable for small community systems located in the Northern River Basins Study area. Types of technologies examined include pre-filtration processes such as coagulation and sedimentation, filtration, and disinfection. Three types of package plants (conventional, tube-type clarification, and adsorption clarifier) suitable for small communities are also reviewed.
Author: Nicholas J. Oke
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 92
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Book Description
Reviews the literature concerning the current state of knowledge of removing organic chemicals from drinking water. Such chemicals may include humic substances produced by degradation of plant and animal matter, contaminated leachate from landfills and lagoons, agricultural runoff, and accidental and illegal dumping of chemicals. Treatment techniques reviewed include coagulation, softening, sedimentation, filtration, chlorination, adsorption on activated carbon or resins, air stripping, reverse osmosis, and the use of oxidants or ultraviolet radiation.
Author: Isabella Marie Gee
Publisher:
ISBN:
Category :
Languages : en
Pages : 196
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Book Description
The removal of inorganic contaminants is a primary concern in drinking water treatment. Fluoride and arsenic both naturally occur in ground and surface waters throughout the world. Recent health concerns regarding extended exposure to high levels of fluoride in drinking water have prompted the United States Environmental Protection Agency (USEPA) to review the fluoride maximum contaminant level (MCL). Arsenic is one of the most well-known and toxic inorganic contaminants regulated by the USEPA. While typically associated with groundwater, arsenic could be an increasing concern for surface water sources in the future. Small water systems may not have the resources to adjust their treatment scheme to accommodate a lower fluoride MCL or target arsenic removal. In this study, enhanced alum coagulation was investigated as a treatment strategy for both fluoride and arsenic. Facilities with surface water sources face a particular challenge, as the presence of natural organic matter (NOM) may interfere with the removal of fluoride and/or arsenic during coagulation. This work builds upon previous investigation of the interactions between fluoride, NOM, and aluminum during coagulation by comparing two pilot studies in Texas and Colorado. Each pilot study confirmed that enhanced alum coagulation was able to remove fluoride during continuous flow experiments using natural source water; the comparison of the studies revealed that source water composition impacts the maximum efficacy of alum coagulation for fluoride removal. A higher influent organic concentration appears to reduce the maximum efficacy of fluoride removal. However, the use of pH control may also be a contributing factor to the discrepancy in fluoride removal between pilot studies. The pilot study with a lower maximum fluoride removal had a higher influent DOC concentration, but was run without pH control. Synthetic water jar testing confirmed the ability of alum coagulation to remove arsenic (V). A maximum arsenic removal of 99% was observed for As(V) at alum doses of 100 mg/L and above, and an alum dose of 20 mg/L achieved an As(V) removal of 97%. Aluminum residuals suggest that the presence of As(V) lowers the point of zero charge for aluminum hydroxide solid.
Author: Municipal Environmental Research Laboratory. Water Supply Research Division
Publisher:
ISBN:
Category : Drinking water
Languages : en
Pages : 86
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Book Description
Author: Inamuddin
Publisher: Materials Research Forum LLC
ISBN: 1945291354
Category : Technology & Engineering
Languages : en
Pages : 458
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Book Description
This book, 'Inorganic Pollutants in Wastewater: Methods of Analysis, Removal and Treatment' extensively investigates the most recent improvements in the area of inorganic pollutants analysis, removal and treatment of wastewater by utilizing different materials such as natural polymers, husks, graphene and carbon nanotube composites, fruit cortex etc. It covers photocatalysis, adsorption, desalination and electrochemical technologies used for the analysis and treatment of inorganic pollutants. Waste Water Treatment, Inorganic Pollutants, Natural Polymers, Husks, Graphene and Carbon Nanotube Composites, Fruit Cortex, Photocatalysis, Adsorption, Desalination, Electrochemical Technologies
Author: Rip G. Rice
Publisher: CRC Press
ISBN: 1351357980
Category : Technology & Engineering
Languages : en
Pages : 378
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Book Description
A review of the nation’s new coverages serves as a ready reminder that drinking water safety is more than regional of local concern. In recent times, the print media alone has drawn attention to barium, bacteria, heavy metals, and increasingly organic contaminants, in public water supplies located in Florida, Rhode Island, Texas, Oregon, Illinois, Minnesota, North Carolina, Michigan, and California, to name a few. In an effort to address one of the major issues confronting the future of the nation’s drinking water supplies, chemical contamination, the Drinking Water Research Foundation and the American Chemical Society presented the symposium, "Safe Drinking Water: the Impact of Chemicals on a Limited Resource." To add balance to the total presentation, two papers were included that were not part of the symposium. Many questions as to the public significance of hundreds of organic chemicals known to be present in the national drinking water supply are waiting to be answered. In some areas of the country, aid rain-induced alterations of the natural leaching process represent an unexplored potential source of toxic pollutants. Finding workable ways to clean up the water supply will be an ongoing task. Addressing these questions, as well as investigating how other countries are responding to these problems, the alternate sources available, such as bottled water, and point of use devices, the presenters in this symposium have attempted to explain the problems, situation, and alternatives. As progress is made in one area, setbacks will occur in another. As we eliminate problems thought chemical technology, we often create others, such as contamination of our waters. While all the situations, problems, and alternatives are not discussed in these proceedings, it is hoped that some attention will be brought to the public, government, and private sectors so that future work will be done to assure the nation of safe drinking water resources.
Author: Sibdas Bandyopadhyay
Publisher: Elsevier
ISBN: 0323972020
Category : Technology & Engineering
Languages : en
Pages : 496
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Book Description
Advances in Drinking Water Purification: Small Systems and Emerging Issues captures the knowledge and impact on the performance of various types of water purification technologies and identities the need for further development with a view to carry forward the SDG global targets of achieving safe and affordable drinking water. The book bridges the knowledge gap between various types of treatability options which is essential for selection of suitable treatment systems and augmentation in the desirable levels of specific contaminants. It focuses on providing the scope of selecting location specific technology options by presenting multiple approaches for treatment of most crucial toxic contaminants/pathogens. In addition, it provides insights into the effect of nature of impurities and selection of treatment options on the global quality of drinking water, comprising its possible impacts on the efficiency of the techniques used and thus on the safety of drinking water. This information is indispensable in identifying the appropriate technology depending on the socioeconomic conditions to address the problem of decontamination in drinking water. Discusses point-of-use devices for the removal of organic and inorganic contaminants from drinking water Provides a multipronged approach to encourage, recognize, protect and commercialize available options for water purification Includes case studies for field testing/pilot trials Provides an in-depth analysis on the efficacy of small systems with an emphasis on the sustainability, socio-technical aspects and emerging issues
Author:
Publisher:
ISBN:
Category : Environmental protection
Languages : en
Pages : 884
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Book Description
Author: J.L. Hatfield
Publisher: Elsevier
ISBN: 0080569897
Category : Science
Languages : en
Pages : 719
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Book Description
Nitrogen is one of the most critical elements for all life forms. In agricultural systems it is essential for the production of crops for feed, food, and fiber. The ever-increasing world population requires increasing use of nitrogen in agriculture to supply human needs for dietary protein. Worldwide demand for nitrogen will increase as a direct response to increasing population. Nitrogen in the Environment provides a wholistic perspective and comprehensive treatment of nitrogen. The scope of this book is diverse covering a range of topics and issues related to furthering our understanding of nitrogen in the environment at farm and national levels. Issues of nitrogen from its effects on crops and human nutrition to nitrogen in ground water, watersheds, streams, rivers, and coastal marine environments are discussed to provide a broad view of the problem and support scientists, researchers, and engineers in formulating comprehensive solutions. The only source which presents an international, wholistic perspective of the effects of nitrogen in the environment with worldwide mitigation practices Provides details on how to improve the quality of the environment by analyzing the development of emerging technologies Develops strategies to be used by soil scientists, agronomists, hydrologists, and geophysicists for broad scale improvement of nitrogen efficiency
