The Effects of Ozonation Pathways on the Formation of Ketoacids and Assimilable Organic Carbon (AOC) in Drinking Water PDF Download
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Author: Kyung-Hyuk Lee
Publisher:
ISBN:
Category : Drinking water
Languages : en
Pages : 370
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Book Description
Author: Kyung-Hyuk Lee
Publisher:
ISBN:
Category : Drinking water
Languages : en
Pages : 370
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Book Description
Author: Rodney S. Magazinovic
Publisher:
ISBN:
Category : Drinking water
Languages : en
Pages : 380
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Book Description
Author: Philip C. Singer
Publisher: American Water Works Association
ISBN: 089867994X
Category : Chloramines
Languages : en
Pages : 342
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Book Description
Author: Dwayne A. Rollag
Publisher:
ISBN:
Category : Water
Languages : en
Pages : 116
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Book Description
Author: Jakob Kämmler
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Groundwater resources present a major reservoir for worldwide drinking water production that is used intensively due to its consistent quality and availability. Organic-rich groundwater resources with high concentration of natural organic matter (NOM) are not used to their full potential due to the negative impact of NOM on treatment processes and on water quality, particularly on water coloration. This work examines the ozonation-biofiltration process to enhance NOM removal in drinking water production from organic-rich groundwater. Objects of research regarding the ozonation-biofiltration of organic-rich groundwater were (i) the transformation of groundwater NOM, (ii) by-product formation and its minimization and (iii) applicability and integration potential into groundwater treatment. An experimental approach was chosen to address these objects of research. Experiments included batch ozonation, small-scale pilot ozonation-biofiltration and membrane ozonation using different natural, organic-rich groundwaters. Ozonation of organic-rich groundwater is characterized by rapid ozone (O3) consumption by NOM, normalized to the dissolved organic carbon (DOC) content of groundwater (approxi-mately 0.5 mgO3/mgDOC in the first 30 s of ozonation). This results in significant reduction of ultraviolet absorbance (UV254) and color (SAC436) but in low disintegration of NOM to smaller molecular size and therefore moderate formation of assimilable organic carbon (AOC). The simultaneous formation of bromate, a presumed human carcinogen, may exceed international drinking water limits under these conditions. This is due to high bromide contents of groundwaters and presumably enhanced by hydroxyl radicals formed by ozonation of phenolic NOM. Biofiltration of ozonated groundwater by granular activated carbon and phonolithe results in significant reduction of AOC and minor reduction of UV254, SAC436 and DOC. Overall SAC436 removal potential by small-scale pilot ozonation-biofiltration was 40-50 % at bromate concentrations “ 10 μg L-1, for two different groundwaters. For other groundwaters used in batch ozonation experiments, SAC436 removal potential may be up to 70 %. Decolorization performance of ozonation-biofiltration may be enhanced by the implementation of bromate minimization strategies. Process-oriented strategies (multi-stage ozonation and membrane ozonation) and pH reduction showed the highest potential to improve the trade-off between decolorization and bromate formation. Addition of ammonia or hydrogen peroxide reduced bromate concentration only at high ozone doses or compromised decolorization. Ozonation-biofiltration was performed with different feed water qualities including raw groundwater, aerated groundwater and finished groundwater, indicating high potential for integration into groundwater treatment. Overall, it was shown that ozonation-biofiltration is applicable in different groundwater matrices, for different feed water qualities, at low ozone doses of
Author: Bhavana Sushilkumar Karnik
Publisher:
ISBN:
Category : Disinfection and disinfectants
Languages : en
Pages : 492
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Book Description
Author: Ervin Orlandini
Publisher: Routledge
ISBN: 1351425293
Category : Science
Languages : en
Pages : 188
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Book Description
This research aimed to identify and understand mechanisms thar underlie the beneficial effect of ozonation on removal of pesticides and other micropollutants by Granular Activated Carbon (GAC) filtration. This allows optimization of the combination of these two processes, termed Biological Activated Carbon filtration. The study concluded that ozonation significantly improves removal of atrazine by GAC filtration not only due to the wellknown effect of oxidation of atrazine, but also due to the effect of partical oxidation of Background Organic Matter (BOM) present in water. Ozone-induced oxidation of BOM was found to improve adsorption of atrazine in GAC filters. Biodegradation of atrazine in these filters wasnot demonstrated. Higher GAC's adsorption capacity for atrazine and faster atrazine's mass transfer in filters with ozonated rather than non-ozonated influent were explained as due to ozonated BOM. Both can be attributed to enhanced biodegradability and reduced adsorbsbility of partially ozidated BOM compounds, resulting in their increased biodegradation and decreased adsorption in GAC filters.
Author: Bruno Langlais
Publisher: Routledge
ISBN: 1351426141
Category : Juvenile Nonfiction
Languages : en
Pages : 588
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Book Description
With the advent of the Safe Drinking Water Act Amendments of 1986, many water utilities are reexamining their water treatment practices. Upcoming new regulations on disinfection and on disinfection by-products, in particular, are the primary driving forces for the big interest in ozone. It appears that ozone, with its strong disinfection capabilities, and apparently lower levels of disinfection by-products (compared to other disinfectants), may be the oxidant/disinfectant of choice. Many utilities currently using chlorine for oxidation may need to switch due to chlorine by-product concerns. Utilities using chloramines may need to use ozone to meet CT requirements. This book, prepared by 35 international experts, includes current technology on the design, operation, and control of the ozone process within a drinking water plant. It combines almost 100 years of European ozone design and operating experience with North American design/operations experience and the North American regulatory and utility operational environment. Topics covered include ozone chemistry, toxicology, design consideration, engineering aspects, design of retrofit systems, and the operation and economics of ozone technology. The book contains a "how to" section on ozone treatability studies, which explains what information can be learned using treatability studies, at what scale (bench, pilot, or demonstration plant), and how this information can be used to design full-scale systems. It also includes valuable tips regarding important operating practices, as well as guidance on retrofits and the unique issues involved with retrofitting the ozone process. With ozone being one of the hottest areas of interest in drinking water, this book will prove essential to all water utilities, design engineers, regulators, and plant managers and supervisors.
Author: Christiane Gottschalk
Publisher: John Wiley & Sons
ISBN: 3527628932
Category : Technology & Engineering
Languages : en
Pages : 378
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Book Description
The leading resource on ozone technology, this book contains everything from chemical basics to technical and economic concerns. The text has been updated to include the latest developments in water treatment and industrial processes. Following an introduction, the first part looks at toxicology, reaction mechanisms and full-scale applications, while Part B covers experimental design, equipment and analytical methods, mass transfer, reaction kinetics and the application of ozone in combined processes.
Author: Christiane Gottschalk
Publisher: John Wiley & Sons
ISBN: 3527613358
Category : Science
Languages : en
Pages : 199
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Book Description
The ozonation of compounds in water is a complex process. The mechanisms are very complicated, the parameters are many, but the possibilities of developing cost-effective treatment schemes for drinking water and waste water are large. Most books available today concentrate on either drinking water or waste water treatment, seldom dealing with both or explaining the essential differences. And only rare exceptions deal with the how-to of ozone experiments. This practical guide fills the gap. It contains the cumulative knowledge on experimental design, execution, interpretation and application. Drawing on experience gained from hours spent on laboratory research with drinking and waste waters, literature study, intensive discussion with leading experts, perplexed reflection and deep thought, the book offers practical help to avoid common pitfalls and unnecessary work. This book is aimed at professionals in industry and research currently using ozonation who want to optimize their system, as well as students beginning work with ozonation. It contains just enough information for beginners to start with, but goes rapidly to the detailed information that advanced readers need.
