Factors Affecting Disinfection By-product Formation During Chloramination
Author | : James M. Symons |
Publisher | : American Water Works Association |
Total Pages | : 366 |
Release | : 1998 |
Genre | : Chloramines |
ISBN | : 0898679060 |
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Author | : James M. Symons |
Publisher | : American Water Works Association |
Total Pages | : 366 |
Release | : 1998 |
Genre | : Chloramines |
ISBN | : 0898679060 |
Author | : Gerald E. Speitel Jr |
Publisher | : American Water Works Association |
Total Pages | : 246 |
Release | : 2005-05-31 |
Genre | : Science |
ISBN | : 184339930X |
In response to current and anticipated disinfection by-product (DBP) regulations, many utilities have begun to use chloramines as a secondary disinfectant. Chloramination produces DBPs such as haloacetic acids (HAAs), trihalomethanes (THMs), and haloacetonitriles (HANs) in lower concentrations than chlorination. Previous research has demonstrated that dihalogenated haloacetic acids (DXAAs) are the most commonly formed HAAs during chloramination. Some utilities may have difficulty meeting the new maximum contaminant level (MCL) for HAAs because chloramination does not limit the formation of DXAAs to the same extent as it does other DBPs. The objectives of this project were to: better understand the reactivity of key natural organic matter (NOM) fractions and the effects of treatment processes with respect to dihaloacetic acid (DXAA) formation, better delineate the influence of pH and Cl2/N ratio on DXAA formation, characterize DXAA formation kinetics and the impact of treatment processes on the kinetics, especially the impact of prechlorination, calculate the rate and extent of DXAA formation at elevated summer water temperatures, and determine the effect of bromide concentration on DXAA speciation and kinetics.
Author | : |
Publisher | : American Water Works Association |
Total Pages | : 356 |
Release | : 2006 |
Genre | : Water |
ISBN | : 1583214631 |
The goal of this project was to understand the formation and decay of selected DBPs in full-scale distribution systems focusing on the four THMs and the nine HAAs, as well as individual THM and HAA species. Because of its critical nature, NDMA was also included. The project objectives were: evaluate the critical factors that affect THM and HAA behavior in distribution systems; determine the fate and behavior of NDMA in distribution systems; evaluate the effect of pipe material and diameter on the fate of DBPs in distribution systems; examine the effect of storage reservoirs / tanks and booster chlorination stations on THM, HAA and NDMA concentrations; evaluate the changes in DBP concentrations and speciation when a system seasonally switches from chloramines to free chlorine to limit potential nitrification episodes....
Author | : Robert M. Clark |
Publisher | : DIANE Publishing |
Total Pages | : 330 |
Release | : 2001 |
Genre | : Drinking water |
ISBN | : 142890073X |
Author | : Gregory J. Kirmeyer |
Publisher | : American Water Works Association |
Total Pages | : 278 |
Release | : 2004 |
Genre | : Nature |
ISBN | : 9781583213315 |
This manual recommends optimal operational criteria for chloramine application to enhance and protect distribution system water quality. It examines the chemical characteristics of chloramines, documents the use of chloramines with case studies, and provides planning, design, startup, and monitoring strategies for optimizing the use of chloramines.
Author | : National Academies of Sciences, Engineering, and Medicine |
Publisher | : National Academies Press |
Total Pages | : 291 |
Release | : 2020-02-20 |
Genre | : Medical |
ISBN | : 030949382X |
Legionnaires' disease, a pneumonia caused by the Legionella bacterium, is the leading cause of reported waterborne disease outbreaks in the United States. Legionella occur naturally in water from many different environmental sources, but grow rapidly in the warm, stagnant conditions that can be found in engineered water systems such as cooling towers, building plumbing, and hot tubs. Humans are primarily exposed to Legionella through inhalation of contaminated aerosols into the respiratory system. Legionnaires' disease can be fatal, with between 3 and 33 percent of Legionella infections leading to death, and studies show the incidence of Legionnaires' disease in the United States increased five-fold from 2000 to 2017. Management of Legionella in Water Systems reviews the state of science on Legionella contamination of water systems, specifically the ecology and diagnosis. This report explores the process of transmission via water systems, quantification, prevention and control, and policy and training issues that affect the incidence of Legionnaires' disease. It also analyzes existing knowledge gaps and recommends research priorities moving forward.
Author | : James H. Raymer |
Publisher | : RTI Press |
Total Pages | : 15 |
Release | : 2010-07-31 |
Genre | : Cooking |
ISBN | : |
Humans are exposed to water disinfection by-products (DBPs) through direct ingestion of tap water and via inhalation and dermal absorption. Additional exposure from cooking foods in tap water containing DBPs has not been explored. We conducted controlled laboratory experiments to determine potential excess exposures to DBPs—haloacetonitriles and haloacetic acids (HAAs). Some HAAs and haloacetonitriles decomposed within 10 minutes in boiling water; other analytes remained. During cooking in or contact with water, foods—frozen carrots, frozen green beans, dried pinto beans, chicken, pasta (spaghetti), and lettuce—absorbed up to 60 percent of HAA DBPs. In general, chlorodibromoacetic and tribromoacetic acids were not detected in the food after cooking. Pasta rinsed in HAA-containing spiked reagent water was shown to absorb additional HAAs and elevate the excess dietary exposure above that from cooking alone. HAA-containing tap water used to boil foods during preparation can increase the potential for human exposure, the magnitude of which depends on the types of foods cooked, the cooking duration, the volume of water used to cook the food, and the quantity of the food consumed. Regulators should consider excess dietary exposures when defining the acceptable quantities of DBPs, at least for HAAs, in tap water.
Author | : Puangrat Kajitvichyanukul |
Publisher | : IWA Publishing |
Total Pages | : 242 |
Release | : 2019-11-15 |
Genre | : Science |
ISBN | : 1789061237 |
Frontier technology in water treatment and pollutant removal is needed not only for maximizing water reuse but also for the rapid detection of contaminants in the recycled water. The UN announced the years 2018 to 2028 as the ‘International Decade for Action–Water for Sustainable Development’. To realize this mission, innovative and frontier technologies for water treatment and pollutant removal are important components. This book aims to serve as a platform for updating the scientific community with recent progress in this area, covering frontier technologies in analytical technique, physicochemical treatment, chemical treatment, and biological treatment. In Focus – a book series that showcases the latest accomplishments in water research. Each book focuses on a specialist area with papers from top experts in the field. It aims to be a vehicle for in-depth understanding and inspire further conversations in the sector.
Author | : M.N.V. Prasad |
Publisher | : Butterworth-Heinemann |
Total Pages | : 490 |
Release | : 2020-02-21 |
Genre | : Technology & Engineering |
ISBN | : 0081029772 |
Disinfection Byproducts in Drinking Water: Detection and Treatment presents cutting-edge research on how to understand the procedures, processes and considerations for detecting and treating disinfection by-products from drinking water, swimming pool water, and wastewater. The book begins with an overview of the different groups of Disinfection Byproducts (DBPs), such as: Trihalomethanes (THM), Halo acetic acids, and Haloacetonitrile (HAN). This coverage is quickly followed by a clear and rigorous exposition of the latest methods and technologies for the characterization, occurrence, formation, transformation and removal of DBPs in drinking water. Other chapters focus on ultraviolet-visible spectroscopy, electron spin resonance, and gas chromatography-mass spectrometry. Researchers will find a valuable resource to a breath of topics for DBP detection and treatment, including various recent techniques, such as microfiltration, nanofiltration membrane and nanotechnology.
Author | : |
Publisher | : Elsevier |
Total Pages | : 180 |
Release | : 2021-04-01 |
Genre | : Science |
ISBN | : 0444643443 |
Drinking water disinfection has markedly reduced diseases causes by waterborne pathogenic microorganisms. However, an unintended consequence of disinfection and/or oxidation processes is the generation of disinfection byproducts (DBPs) which are formed from the reactions of disinfectants/oxidants with water matrix components. This volume of the Comprehensive Analytical Chemistry Handbook presents recent advances about the formation, identification, and quantification of inorganic and organic DBPs during oxidative processes. The book begins with a first chapter reviewing the most recent non-targeted screening approaches and workflows to characterize DBPs using low-, high-, and ultra-high-resolution mass spectrometry. The second chapter discusses the analysis of inorganic chloramines in waters using on-site and/or in-lab analytical methods. The third chapter provides an overview of the current knowledge about the mechanisms of chlorine dioxide reactions and byproducts formation. The fourth chapter presents some fundamental and practical aspects about ozonation processes in water treatment and provides an overview about ozone reaction mechanisms and byproducts formation. The fifth chapter focuses on the reactivity of halide ions, particularly bromide and iodide, with common oxidants and the role they play in determining the speciation of DBPs in treated waters. The chapter also presents strategies to mitigate the formation of DBPs during oxidation processes. Finally, the last chapter tackles the topic of DBPs formation during potable water reuse. It discusses the formation of DBPs of major concern in both memebrane-based and non-membrane-based potable water reuse treatment schemes.Researchers, water treatment specialists, and regulators will find in this book a valuable and compact resource on several key topics regarding the formation, identification, quantification, and mitigation of DBPs. - Identification and quantification of known and unknown DBPs - Formation of DBPs during different disinfection/oxidation processes - DBPs of concern in new technologies and/or new applications of existing technologies in water treatment