Download or read book Kinetics and Byproduct Formation of Benzoic Acid Degradation by the UV chlorine Process written by Yun Fu and published by . This book was released on 2013 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modifications to Dissolved Organic Matter and Disinfection Byproduct Formation During Solar Chlorine Photolysis and Related Oxidative Treatment as Applied to Drinking Water Treatment written by Tessora Young and published by . This book was released on 2019 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chlorine is a common disinfectant used for water treatment worldwide, however not all pathogens can be inactivated using chlorine alone. Solar irradiation of chlorinated waters enhances inactivation of chlorine-resistant pathogens, through in situ formation of ozone and hydroxyl radical during photolysis of free available chlorine (FAC) at UVA/UVB wavelengths of sunlight (290 - 400nm). Organic and inorganic water constituents (e.g., natural organic matter (NOM), bromide, and carbonate) are also reactive with these photooxidants and can be linked to the formation of regulated drinking water disinfection byproducts (DBP). To evaluate the feasibility of this process as a novel water treatment, a variety of relevant surface water matrixes need to be treated via solar chlorine photolysis while monitoring consequent DBP. A suite of relevant chlorinated and brominated disinfection/oxidation byproducts (some regulated by the U.S. EPA) were monitored including oxyhalides, four trihalomethanes (THMs), and nine haloacetic acids (HAA9). Changes to NOM were characterized by monitoring spectral and redox properties, and molecular weight distributions during solar chlorine photolysis and compared to changes associated with conventional drinking water treatment (e.g., chlorination, ozonation, and advanced oxidation processes (AOP)). The results from this study show formation of DBPs vary significantly with water composition. Chlorate concentrations increased during solar photolysis of FAC (8mg/L as Cl2) at pH 8, and bromate formation followed similar trends (1.8x increase at pH 8 vs. pH 6) with 200 [micro]g/L bromide. Addition of NOM (Suwannee River) adds a competitor for radical and ozone species, and completely disrupted chlorate and bromate formation mechanisms; less reactive, natural waters limited oxyhalide formation to a lesser degree. Natural organic matter contributes to THM and HAA formation during chlorination and organic DBP yields increased further following solar chlorine photolysis (solar fluences > 4 J/cm2). Control experiments showed that increased organic DBP levels were not due to direct SRNOM photolysis and subsequent dark reactions with HOCl, but to co-exposure of SRNOM to HOCl and reactive species (e.g., O3, HO ̇, Cl ̇, ClO ̇) generated by FAC photolysis. [ABTS ̇+]− was utilized to quantify changes in the electron donating capacity (EDC) of natural organic matter (NOM) isolates and two model compounds: phenol a model for reactive aromatic moieties, and benzoic acid a model for less reactive aromatic moieties. Low exposures of FAC (CT[subscript]FAC = [integral][FAC]dt) significantly decreased the measurable EDC of NOM and phenol, potentially due to rapid halogenation or oxidation of reactive aromatic groups. Once these fast-reacting sites were depleted, the EDC decreased slowly with increasing chlorine exposure. Chlorination resulted in moderate decreases in UV absorbance of the bulk NOM and negligible changes in fluorescence EEM intensity (CT[subscript]FAC [less than or equal to] 400 (mg/L as Cl2)x min). Reactive oxygen species such as ozone and hydroxyl radical (independently or in combination with FAC during solar chlorine photolysis) yielded loss of UV absorbance in the bulk NOM. Pre-treatment of DOM with low exposures of hydroxyl radical (UV/H2O2, X-ray radiolysis, or O2−/O3) led to increased EDC for NOM and benzoic acid, and increased THM and HAA formation after dark chlorination for NOM, benzoic acid, and phenol, likely due to hydroxylation of aromatics during pretreatment. Radical scavengers (50mM tert-butanol) suppressed EDC formation and hindered THM and HAA formation. Exposure to O3 itself (with radical scavengers added) actually appears to lead primarily to oxidation and/or ring cleavage, rather than hydroxylation which appears to occur due to HO ̇ generated via O3 decay. X-ray irradiation of hypochlorite at pH 10 (favoring ClO ̇ from reaction between HO ̇ and OCl−) decreased EDC and spectral properties while increasing DBP yields, similar to sunlight-driven chlorine photolysis. Based on these findings, exposure of NOM to ozone, reactive oxygen and halogen species (e.g., HO ̇, Cl ̇, ClO ̇), and FAC during sunlight-driven chlorine photolysis involves hydroxylation of slow reacting aromatic moieties as a key pathway contributing to (a) increased electron donating capacity in aromatic components of the bulk NOM, and (b) increased reactivities toward FAC (and potentially other halogenating agents) to form halogenated organic DBPs. These findings provide an improved understanding of the processes leading to increased formation of DBP precursors during low to moderate exposures of ozone and reactive oxygen or halogen species, and could help identify strategies to minimize organic DBP formation during solar chlorine photolysis or other combinations of chlorine and ROS (such as UVC chlorine photolysis or sequential AOP/FAC treatment) likely to be applied during water and wastewater treatment.

Download or read book Advanced Oxidation Processes for Water Treatment written by Mihaela I. Stefan and published by IWA Publishing. This book was released on 2017-09-15 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced Oxidation Processes (AOPs) rely on the efficient generation of reactive radical species and are increasingly attractive options for water remediation from a wide variety of organic micropollutants of human health and/or environmental concern. Advanced Oxidation Processes for Water Treatment covers the key advanced oxidation processes developed for chemical contaminant destruction in polluted water sources, some of which have been implemented successfully at water treatment plants around the world. The book is structured in two sections; the first part is dedicated to the most relevant AOPs, whereas the topics covered in the second section include the photochemistry of chemical contaminants in the aquatic environment, advanced water treatment for water reuse, implementation of advanced treatment processes for drinking water production at a state-of-the art water treatment plant in Europe, advanced treatment of municipal and industrial wastewater, and green technologies for water remediation. The advanced oxidation processes discussed in the book cover the following aspects: - Process principles including the most recent scientific findings and interpretation. - Classes of compounds suitable to AOP treatment and examples of reaction mechanisms. - Chemical and photochemical degradation kinetics and modelling. - Water quality impact on process performance and practical considerations on process parameter selection criteria. - Process limitations and byproduct formation and strategies to mitigate any potential adverse effects on the treated water quality. - AOP equipment design and economics considerations. - Research studies and outcomes. - Case studies relevant to process implementation to water treatment. - Commercial applications. - Future research needs. Advanced Oxidation Processes for Water Treatment presents the most recent scientific and technological achievements in process understanding and implementation, and addresses to anyone interested in water remediation, including water industry professionals, consulting engineers, regulators, academics, students. Editor: Mihaela I. Stefan - Trojan Technologies - Canada

Download or read book Advanced Oxidation Processes for Water and Wastewater Treatment written by Simon Parsons and published by IWA Publishing. This book was released on 2004-03-01 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: The suitability of Advanced Oxidation Processes (AOPs) for pollutant degradation was recognised in the early 1970s and much research and development work has been undertaken to commercialise some of these processes. AOPs have shown great potential in treating pollutants at both low and high concentrations and have found applications as diverse as ground water treatment, municipal wastewater sludge destruction and VOCs control. Advanced Oxidation Processes for Water and Wastewater Treatment is an overview of the advanced oxidation processes currently used or proposed for the remediation of water, wastewater, odours and sludge. The book contains two opening chapters which present introductions to advanced oxidation processes and a background to UV photolysis, seven chapters focusing on individual advanced oxidation processes and, finally, three chapters concentrating on selected applications of advanced oxidation processes. Advanced Oxidation Processes for Water and Wastewater Treatment will be invaluable to readers interested in water and wastewater treatment processes, including professionals and suppliers, as well as students and academics studying in this area. Dr Simon Parsons is a Senior Lecturer in Water Sciences at Cranfield University with ten years' experience of industrial and academic research and development.

Download or read book Aquatic Redox Chemistry written by Paul Tratnyek and published by OUP USA. This book was released on 2012-06-14 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides a comprehensive overview of aquatic redox chemistry through chapters contributed by many of the leading investigators in the field.

Download or read book Electro Fenton Process written by Minghua Zhou and published by Springer. This book was released on 2017-11-25 with total page 437 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume discusses the theoretical fundamentals and potential applications of the original electro-Fenton (EF) process and its most innovative and promising versions, all of which are classified as electrochemical advanced oxidation processes. It consists of 15 chapters that review the latest advances and trends, material selection, reaction and reactor modeling and EF scale-up. It particularly focuses on the applications of EF process in the treatment of toxic and persistent organic pollutants in water and soil, showing highly efficient removal for both lab-scale and pre-pilot setups. Indeed, the EF technology is now mature enough to be brought to market, and this collection of contributions from leading experts in the field constitutes a timely milestone for scientists and engineers.

Download or read book Applications of Advanced Oxidation Processes AOPs in Drinking Water Treatment written by Antonio Gil and published by Springer. This book was released on 2018-07-03 with total page 437 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume reviews the drinking water treatments in which AOPs display a high application potential. Firstly it reveals the typical supply sources and limitations of conventional technologies and critically reviews natural organic matter characterization and removal techniques, focusing mainly on AOP treatments. It then explores using AOPs for simultaneous inactivation/disinfection of several types of microorganisms, including highly resistant Cryptosporidium protozoa. Lastly, it discusses relevant miscellaneous topics, like the most promising AOP solid catalysts, the regime change of Fenton-like processes toward continuous reactors, the application of chemometrics for process optimization, the impact on disinfection byproducts and the tracing of toxicity during AOP treatments. This work is a useful reference for researchers and students involved in water technologies, including analytical and environmental chemistry, chemical and environmental engineering, toxicology, biotechnology, and related fields. It is intended to encourage industrial and public-health scientists and decision-makers to accelerate the application of AOPs as technological alternatives for the improvement of drinking water treatment plants.

Download or read book Solvent free Organic Synthesis written by Koichi Tanaka and published by John Wiley & Sons. This book was released on 2009-03-02 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this second edition of a best-selling handbook all the chapters have been completely revised and updated, while four completely new chapters have been added. In order to meet the needs of the practitioner, emphasis is placed on describing precisely the technology and know-how involved. Adopting a didactic and comprehensible approach, the book guides the reader through theory and applications, thus ensuring its warm welcome among the scientific community. An excellent, essential and exhaustive overview.

Download or read book Stantec s Water Treatment written by John C. Crittenden and published by John Wiley & Sons. This book was released on 2022-11-08 with total page 1956 pages. Available in PDF, EPUB and Kindle. Book excerpt: The updated third edition of the definitive guide to water treatment engineering, now with all-new online content Stantec's Water Treatment: Principles and Design provides comprehensive coverage of the principles, theory, and practice of water treatment engineering. Written by world-renowned experts in the field of public water supply, this authoritative volume covers all key aspects of water treatment engineering, including plant design, water chemistry and microbiology, water filtration and disinfection, residuals management, internal corrosion of water conduits, regulatory requirements, and more. The updated third edition of this industry-standard reference includes an entirely new chapter on potable reuse, the recycling of treated wastewater into the water supply using engineered advanced treatment technologies. QR codes embedded throughout the book connect the reader to online resources, including case studies and high-quality photographs and videos of real-world water treatment facilities. This edition provides instructors with access to additional resources via a companion website. Contains in-depth chapters on processes such as coagulation and flocculation, sedimentation, ion exchange, adsorption, and gas transfer Details membrane filtration technologies, advanced oxidation, and potable reuse Addresses ongoing environmental concerns, pharmacological agents in the water supply, and treatment strategies Describes reverse osmosis applications for brackish groundwater, wastewater, and other water sources Includes high-quality images and illustrations, useful appendices, tables of chemical properties and design data, and more than 450 exercises with worked solutions Stantec's Water Treatment: Principles and Design, Updated Third Edition remains an indispensable resource for engineers designing or operating water treatment plants, and is an essential textbook for students of civil, environmental, and water resources engineering.

Download or read book Chemistry of Advanced Environmental Purification Processes of Water written by Erik Sogaard and published by Newnes. This book was released on 2014-04-11 with total page 359 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemistry of Advanced Environmental Purification Processes of Water covers the fundamentals behind a broad spectrum of advanced purification processes for various types of water, showing numerous applications through worked examples. Purification processes for groundwater, soil water, reusable water, and raw water are examined where they are in use full-scale, as a pilot approach, or in the laboratory. This book also describes the production of ceramic particles (nanochemistry) and materials for the creation of filtration systems and catalysts that are involved. - Uses chemistry fundamentals to explain the mechanisms behind the various purification processes - Explains in detail process equipment and technical applications - Describes the production of ceramic particles and other new materials applicable to filtration systems - Includes worked examples

Download or read book Uncharted Waters written by Anna Andersson and published by Linköping University Electronic Press. This book was released on 2021-02-15 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt: Disinfection by-products (DBPs) are potentially toxic compounds formed when drinking water is treated with disinfectants, such as chlorine or chloramine. A large proportion of the exposure to DBPs is still unknown and the health risks observed through epidemiological studies cannot be explained by DBPs known today. In this thesis, a part of the unknown DBP fraction is investigated, covering a wide range of non-volatile, chlorine/bromine-containing DBPs. The goals were to investigate how the compositions of these DBPs differ between water treatment plants, how their occurrence changes in the distribution system until reaching consumers and how new treatment techniques can reduce their formation and toxicity. To analyze unknown DBPs, a non-targeted approach adopting ultra-high-resolution mass spectrometry, Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS), was used, where the mass of molecules is measured with such accuracy that the elemental composition of individual DBPs can be calculated. A panel of bioassays was used to assess the combined toxic effects from these DBP mixtures. The results show that the formation of these DBPs to a large extent was specific to each water treatment plant and that local conditions influenced DBP formation, based on e.g., the abundance of organic material with certain chemical structures, bromide and disinfection procedure and agent (chlorine or chloramine). The DBPs were detected in both chlorinated and chloraminated water and in all tap water samples, demonstrating that they are part of human exposure. The number of DBP formulae decreased and the DBP composition changed between drinking water treatment and consumer taps, suggesting that DBP exposure to consumers is not necessarily resembling measurements at the treatment plants. Evaluation of new treatment techniques showed that suspended ion exchange and ozonation have potential to decrease the formation and toxic effects of DBPs and that the removal of organic matter can influence qualitative aspects of DBP formation, such as the proportions of chlorine-containing (less toxic) versus bromine-containing (more toxic) DBPs. Through increased knowledge about the role and relevance of non-volatile DBPs, this work can contribute to future monitoring and actions to reduce the health risks associated with DBPs in chlorinated or chloraminated drinking water. Desinfektionsbiprodukter (DBP:s) är potentiellt giftiga ämnen som bildas när dricksvatten renas med desinfektionsmedel såsom hypoklorit eller monokloramin. En stor del av exponeringen är ännu okänd och hittills kända DBP:s kan inte förklara de hälsorisker som förknippats med klorerat dricksvatten i epidemiologiska studier. I avhandlingen undersöks en relativt okänd fraktion av DBP:s som utgörs av icke-flyktiga, klor/brom-innehållande ämnen. Målen var att undersöka hur dessa DBP:s varierar mellan olika vattenverk, om de förekommer hos konsumenter och hur nya vattenreningstekniker kan minska dess bildandning och relaterad toxicitet. För att mäta okända DBP:s användes ultrahögupplöst masspektrometri (Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS)), med vilken massan hos molekyler kan bestämmas så exakt att atomsammansättningen för enskilda DBP:s kan räknas ut. En serie effektbaserade metoder som bygger på biologiska testsystem användes för att mäta kombinerade toxiska effekter från de studerade biprodukterna. Resultaten visar att största delen av bildade DBP:s var unik för varje vattenverk och att lokala förutsättningar påverkar vilka DBP:s som bildas, till exempel om det finns organiskt material med särskilda kemiska strukturer, bromid eller vilket desinfektionsmedel (klor eller kloramin) som används. De studerade biprodukterna detekterades både i klorerat och kloraminerat dricksvatten och i samtliga kranvatten, vilket innebär att de bidrar till konsumenters exponering. Antalet detekterade DBP:s minskade och sammansättningen ändrades mellan vattenverk och konsument, vilket innebär att DBP exponeringen hos konsumenter inte är densamma som mäts på vattenverken. En utvärdering av nya reningstekniker visade att suspenderat jonbyte och ozonering har potential att minska bildning och relaterad toxisk effekt från DBP:s och att borttagning av organiskt material kan påverka kvalitativa aspekter av DBP bildning, såsom proportionerna av klorerade (mindre toxiska) och bromerade (mer toxiska) DBP:s. Genom ökad insikt om icke-flyktiga DBP:s roll och relevans kan detta arbete bidra till att förbättra framtida uppföljning och insatser för att minska hälsorisker kopplade till DBP:s i klorerat eller kloraminerat dricksvatten.

Download or read book Industrial Environmental Chemistry written by Donald T. Sawyer and published by Springer Science & Business Media. This book was released on 2013-12-11 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph consists of manuscripts submitted by invited speakers who participated in the symposium "Industrial Environmental Chemistry: Waste Minimization in Industrial Processes and Remediation of Hazardous Waste," held March 24-26, 1992, at Texas A&M University. This meeting was the tenth annual international symposium sponsored by the Texas A&M Industry-University Cooperative Chemistry Program (IUCCP). The program was developed by an academic-industrial steering committee consisting of the co-chairmen, Professors Donald T. Sawyer and Arthur E. Martell of the Texas A&M University Chemistry Department, and members appointed by the sponsoring companies: Bernie A. Allen, Jr., Dow Chemical USA; Kirk W. Brown, Texas A&M University; Abraham Clearfield, Texas A&M University; Greg Leyes, Monsanto Company; Jay Warner, Hoechst-Celanese Corporation; Paul M. Zakriski, BF Goodrich Company; and Emile A. Schweikert, Texas A&M University (IUCCP Coordinator). The subject of this conference reflects the interest that has developed in academic institutions and industry for technological solutions to environmental contamination by industrial wastes. Progress is most likely with strategies that minimize waste production from industrial processes. Clearly the key to the protection and preservation of the environment will be through R&D that optimizes chemical processes to minimize or eliminate waste streams. Eleven of the papers are directed to waste minimization. An additional ten papers discuss chemical and biological remediation strategies for hazardous wastes that contaminate soils, sludges, and water.

Download or read book Personal Care Products in the Aquatic Environment written by M. Silvia Díaz‐Cruz and published by Springer. This book was released on 2015-08-10 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume offers an overview of the occurrence and distribution of personal care products in continental and marine waters, presents analytical methods and degradation technologies and discusses their impact on human health. Experts from different disciplines highlight major issues for each family of compounds related to their occurrence in the water column as well as in solid and biota samples, methodological strategies for their analysis, non-conventional degradation technologies, (eco)toxicity data and their human and environmental risk assessment. The book also includes a general introduction to personal care products, covering their properties, use, behaviour and regulatory framework, and a final chapter identifying knowledge gaps and future research trends. It will appeal to experts from various fields of research, including analytical and environmental chemistry, toxicology and environmental engineering.

Download or read book Water Reuse written by National Research Council and published by National Academies Press. This book was released on 2012-07-17 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: Expanding water reuse-the use of treated wastewater for beneficial purposes including irrigation, industrial uses, and drinking water augmentation-could significantly increase the nation's total available water resources. Water Reuse presents a portfolio of treatment options available to mitigate water quality issues in reclaimed water along with new analysis suggesting that the risk of exposure to certain microbial and chemical contaminants from drinking reclaimed water does not appear to be any higher than the risk experienced in at least some current drinking water treatment systems, and may be orders of magnitude lower. This report recommends adjustments to the federal regulatory framework that could enhance public health protection for both planned and unplanned (or de facto) reuse and increase public confidence in water reuse.

Download or read book Exposure to Contaminants in Drinking Water written by Stephen S Olin and published by CRC Press. This book was released on 1998-11-19 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: Exposure to Contaminants in Drinking Water: Estimating Uptake through the Skin and by Inhalation examines the current state of science in this field by identifying and reviewing the available information resources; evaluating various models and approaches; and demonstrating the feasibility of developing estimates of the distribution of absorbed doses of contaminants in drinking water through contact with the skin and by inhalation. This book, the product of a fifteen-member expert working group convened by the Risk Science Institute of the International Life Sciences Institute under a cooperative agreement with the U.S. Environmental Protection Agency's Office of Water, includes contributions from experts in exposure modeling and measurement; water chemistry; time-activity patterns; dermal and respiratory uptake; and the use of probability distributions in characterizing exposures.

Download or read book Water and Wastewater Treatment written by Joseph Welker and published by Callisto Reference. This book was released on 2021-11-16 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: Water treatment is the process of improving water quality by removing contaminants and other undesired components, so that it becomes suitable for specific end-use. There are two types of water treatment, namely, drinking water treatment and industrial water treatment.The process used for removing contaminants from sewage and wastewater is known as wastewater treatment. The treatment aims at converting the wastewater into effluent so that it can be returned to water cycle. Water reclamation is the process of converting wastewater into water which can be reused. Wastewater treatment plant is the facility where the process takes place. There are various processes which are used for treatment of wastewater, such as phase separation, sedimentation, biochemical oxidation, etc. This book elucidates the concepts and innovative models around prospective developments with respect to water and wastewater treatment. Most of the topics introduced herein cover new techniques and the applications of water and wastewater treatment. This textbook will serve as a valuable source of reference for those interested in this field.

Download or read book Environmental Biotechnology Volume 4 written by K. M. Gothandam and published by Springer Nature. This book was released on 2021-09-24 with total page 269 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews the production of bioplastic from various raw materials and recycling wastewater into useful bioproducts by bacteria. In addition, it also addresses the recent advancement in pest control in rice plants, different methods to analyse genotoxicity on soil samples and the effect of phytocompounds on acrylamide-induced toxicity in Drosophilla. Interestingly, this book also discusses mesoporous silica nanoparticles' role as nanocarrier material for inhibiting the cancer cell, especially breast cancer and various biotechnological applications of marine fungal exopolysaccharides.