The formation, control, and health effects of DBPs in drinking water are issues of international concern because of the health effects (e.g., bladder cancer and potential adverse reproductive-development impacts) associated with exposure to certain DBPs. As a result, many countries, as well as the World Health Organization, have regulations and/or guidelines on acceptable concentrations of DBPs in water.In recent years, DBP research worldwide has focused on determining the possible adverse health effects of emerging, yet unregulated, DBPs, specifically halogenated (e.g., iodinated) and non-halogenated nitrogenous (e.g., nitrosamines) DBPs. The breadth of DBP research is very broad from source waters (e.g., wastewater, wildfire, seawater intrusion influences) to treatment strategies and technologies, followed by distribution system and point of entry issues (e.g., biofilms, heating, swimmingpools), as well as health effects and analytical method developments. Recent research is helping to understand factors controlling formation and to develop a cost-effective control of a wide range of regulated and emerging DBPs. Furthermore, the pace of research on emerging DBP toxicity has increasedand generated diverse findings, with comparative toxicity and the molecular mechanisms leading to improved understanding of their toxicity pathways and potential adverse biological effects.This book represents the latest research efforts to understanding these important DBP-related issues. The authors of the chapters in this book are a multidisciplinary group of scientists and engineers, who are conducting studies in many parts of the world. The chapters in this book address both regulated and emerging DBPs and are organized under the sections on DBP toxicology and health effects, modeling of DBP formation, precursors and reactions involving nitrosamines, and formation ofhalogenated DBPs. This book will be of interest to researchers, drinking water utility scientists and engineers, toxicologists, epidemiologists, and regulators interested in the formation and control of and exposure to DBPs.

Since their discovery, disinfection by-products (DBPs) have become one of the major driving forces in drinking water regulations, research and water utility operations throughout the world. The list of DBPs that can occur in treated drinking waters has grown from a few trihalomethanes to a long list of halogenated and non-halogenated organic or inorganic compounds. This list is expected to continue to grow as the analytical techniques are improved, as moreinformation on their toxicity is developed, and as more occurrence studies are conducted. This book documents the latest DBP research findings, including emerging issues and state-of-the-art studies. Specifically, papers on the occurrence, formation, control, and health effects of emerging (unregulated)halogenated (e.g., brominated) and nonhalogenated (e.g., nitrosamines) DBPs (e.g., emerging nitrogenous vs. regulated carbonaceous DBPs) are presented. In addition to the characterization and reactivity of natural organic matter to form DBPs, new studies on algal organic matter and treated wastewater as sources of DBPs and their precursors are discussed.

Consumers today demand drinking water that looks, smells, and tastes good. The occurrence of aesthetically unpleasing T&O compounds in water creates a perception of unsafe water. The main sources of T&O problems in municipal water supplies are certain types of algae, mainly blue-green algae (cyanobacteria) and fungi (actinomycetes). Although many compounds may impart T&O to water, by far the most commonly reported are two chemicals: geosmin and MIB.? Treatment removal of algal metabolites demonstrated that microcystins measured lower after the addition of powdered activated carbon (PAC). Treatment removal showed that low levels of chlorine oxidize microcystins given sufficient contact time. Water distribution samples were split between a flavor profile analysis (FPA) panel and a gas chromatograph mass spectrometer (GC/MS). Data generated between the FPA and the GC/MS showed high variability for geosmin and MIB. FPA results showed a direct correlation with MIB and geosmin, but were weak for cyclocitral. FPA results could be predicted with MIB/geosmin plots and with a MIB, geosmin, and cyclocitral plot. ? ? ?

EDCs and pharmaceuticals are groups of emerging contaminants that have been detected at trace concentrations in waters around the world. These contaminants encompass a vast range of molecular structure and properties. Sparse data exist on the occurrence and fate of these emerging contaminants during water treatment. This project investigated EDC/pharmaceutical occurrence in U.S. drinking water and the efficacy of conventional and advanced water treatment processes to reduce the concentrations of these contaminants.? The objectives of this study were to (1) select a diverse group of representative endocrine disrupting chemicals (EDCs) and pharmaceuticals, (2) develop a robust analytical methodology capable of trace detection of target compounds in a variety of water matrices, (3) determine the occurrence of target compounds in U.S. drinking waters, (4) evaluate the EDC/pharmaceutical removal potential of conventional and advanced drinking and reuse water processes, and (5) evaluate computer models to predict target compound properties and fate.? This report provides fundamental information on the removal of several classes of pharmaceuticals, personal care products, and suspected endocrine disrupting chemicals by conventional and advanced water treatment processes. A detailed description of analytical methods is provided, including information on sample preservation, extraction, and instrumental analysis. The report provides some of the first U.S. occurrence data for these emerging contaminants in raw and finished drinking water supplies. From the treatment and occurrence information, compounds with likely occurrence can be selected for monitoring programs that will represent the fate of various classes of emerging contaminants. Computer models are described that can be used to predict properties and fate of future water contaminants.

The formation, control, and health effects of DBPs in drinking water are issues of international concern because of the health effects (e.g., bladder cancer and potential adverse reproductive-development impacts) associated with exposure to certain DBPs. As a result, many countries, as well as the World Health Organization, have regulations and/or guidelines on acceptable concentrations of DBPs in water.In recent years, DBP research worldwide has focused on determining the possible adverse health effects of emerging, yet unregulated, DBPs, specifically halogenated (e.g., iodinated) and non-halogenated nitrogenous (e.g., nitrosamines) DBPs. The breadth of DBP research is very broad from source waters (e.g., wastewater, wildfire, seawater intrusion influences) to treatment strategies and technologies, followed by distribution system and point of entry issues (e.g., biofilms, heating, swimmingpools), as well as health effects and analytical method developments. Recent research is helping to understand factors controlling formation and to develop a cost-effective control of a wide range of regulated and emerging DBPs. Furthermore, the pace of research on emerging DBP toxicity has increasedand generated diverse findings, with comparative toxicity and the molecular mechanisms leading to improved understanding of their toxicity pathways and potential adverse biological effects.This book represents the latest research efforts to understanding these important DBP-related issues. The authors of the chapters in this book are a multidisciplinary group of scientists and engineers, who are conducting studies in many parts of the world. The chapters in this book address both regulated and emerging DBPs and are organized under the sections on DBP toxicology and health effects, modeling of DBP formation, precursors and reactions involving nitrosamines, and formation ofhalogenated DBPs. This book will be of interest to researchers, drinking water utility scientists and engineers, toxicologists, epidemiologists, and regulators interested in the formation and control of and exposure to DBPs.

Since their discovery, disinfection by-products (DBPs) have become one of the major driving forces in drinking water regulations, research and water utility operations throughout the world. The list of DBPs that can occur in treated drinking waters has grown from a few trihalomethanes to a long list of halogenated and non-halogenated organic or inorganic compounds. This list is expected to continue to grow as the analytical techniques are improved, as moreinformation on their toxicity is developed, and as more occurrence studies are conducted. This book documents the latest DBP research findings, including emerging issues and state-of-the-art studies. Specifically, papers on the occurrence, formation, control, and health effects of emerging (unregulated)halogenated (e.g., brominated) and nonhalogenated (e.g., nitrosamines) DBPs (e.g., emerging nitrogenous vs. regulated carbonaceous DBPs) are presented. In addition to the characterization and reactivity of natural organic matter to form DBPs, new studies on algal organic matter and treated wastewater as sources of DBPs and their precursors are discussed.

Consumers today demand drinking water that looks, smells, and tastes good. The occurrence of aesthetically unpleasing T&O compounds in water creates a perception of unsafe water. The main sources of T&O problems in municipal water supplies are certain types of algae, mainly blue-green algae (cyanobacteria) and fungi (actinomycetes). Although many compounds may impart T&O to water, by far the most commonly reported are two chemicals: geosmin and MIB.? Treatment removal of algal metabolites demonstrated that microcystins measured lower after the addition of powdered activated carbon (PAC). Treatment removal showed that low levels of chlorine oxidize microcystins given sufficient contact time. Water distribution samples were split between a flavor profile analysis (FPA) panel and a gas chromatograph mass spectrometer (GC/MS). Data generated between the FPA and the GC/MS showed high variability for geosmin and MIB. FPA results showed a direct correlation with MIB and geosmin, but were weak for cyclocitral. FPA results could be predicted with MIB/geosmin plots and with a MIB, geosmin, and cyclocitral plot. ? ? ?

EDCs and pharmaceuticals are groups of emerging contaminants that have been detected at trace concentrations in waters around the world. These contaminants encompass a vast range of molecular structure and properties. Sparse data exist on the occurrence and fate of these emerging contaminants during water treatment. This project investigated EDC/pharmaceutical occurrence in U.S. drinking water and the efficacy of conventional and advanced water treatment processes to reduce the concentrations of these contaminants.? The objectives of this study were to (1) select a diverse group of representative endocrine disrupting chemicals (EDCs) and pharmaceuticals, (2) develop a robust analytical methodology capable of trace detection of target compounds in a variety of water matrices, (3) determine the occurrence of target compounds in U.S. drinking waters, (4) evaluate the EDC/pharmaceutical removal potential of conventional and advanced drinking and reuse water processes, and (5) evaluate computer models to predict target compound properties and fate.? This report provides fundamental information on the removal of several classes of pharmaceuticals, personal care products, and suspected endocrine disrupting chemicals by conventional and advanced water treatment processes. A detailed description of analytical methods is provided, including information on sample preservation, extraction, and instrumental analysis. The report provides some of the first U.S. occurrence data for these emerging contaminants in raw and finished drinking water supplies. From the treatment and occurrence information, compounds with likely occurrence can be selected for monitoring programs that will represent the fate of various classes of emerging contaminants. Computer models are described that can be used to predict properties and fate of future water contaminants.