Download or read book Alternative Filter Media in Rapid Gravity Filtration of Potable Water written by Phillip D. Davies and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Sand has been the main filter media used in rapid gravity filtration since their emergence in the 19th century. This dominance is due to its low cost, availability and extensive experience which has led to dependable and predictable performance. Over recent years multi-media filters have become the typical filter arrangement. Sand still remains the preferred filter medium in the lower layer with typically anthracite used in the upper layer. A limitation to match previous work has been the emphasis on overall performance but mechanistic analysis as to the reasons for the variations compared to sand has been rare. The fundamental effects of particle size and consolidation on filtration performance and headloss are known but were not often accounted for in the reported research. This has limited the academic contribution of previous work and made it more difficult to compare with the data for this thesis. At an average treatment works the highest costs are associated with the use of chemicals (30 %) and power (60 %) required mainly for pumping. Rapid gravity filters are one of the least energy demanding stages in this system, only requiring pumping for backwashing and air scour, assuming gravity feed was incorporated into the design. Energy efficiency of water treatment has become more important and the research was conducted to determine if the use of novel new media could be used to improve the performance of the filters with regards to turbidity and headloss. For example, the result presented within this thesis demonstrates through the use of angular media improved performance to benefit both turbidity and headloss performance. This was obtained from slate having a sphericity of 0.49 compared to sand at 0.88. In addition the use of novel materials with different physical properties has allowed an extension to analysis of performance using fundamental filtration mechanisms. The greater range of properties available from the novel media used in this thesis compared to sand has suggested additions to this theory. The use of surface reactive materials, including limestone, has shown the removal of additional contaminants such as phosphorus, iron, aluminium and manganese not typically associated with rapid gravity filtration. An assessment of the impact these reactions had on typical filter performance criteria, for example turbidity, headloss and life expectancy. The results showed an 97 % removal of Fe in the limestone compared to 13 % for sand. This was brought about by the precipitation of hydroxide, coagulation, a pH change and consequent co-precipitation. In the case of iron and aluminium removal this pH induced change was theorized as the most likely cause of coagulation within the filter bed itself leading to improved turbidity removal performance. Filter media chosen for laboratory and pilot study in this work was firstly assessed using British Standards tests, but additional tests were added that could provide additional characterisation data. The media were selected based on an individual fundamental property that differed from the other media selected whilst retaining the standard RGF size. Filtralite for example offered a high surface area, limestone a more active surface and slate a plate-like particle shape. Glass had a very smooth surface texture and as a recycled material better sustainability. Four of these filter media (Sand (control), Glass, Filtralite and Slate) were then selected for further on-site pilot plant studies, based on results from the laboratory work. Both the laboratory and pilot study suggested that turbidity and headloss performance could be improved by changes in media specification. The results showed that after particle size, angularity of the media was the most important factor affecting turbidity and headloss performance. A greater angularity led to improvements in filter run time with for example a doubling of filter run time with the slate compared to sand for the same turbidity removal in the pilot plant. Previous literature had suggested an improvement in turbidity performance but that head loss would deteriorate but this was not seen in the data from this research, with slate (sphericity of 0.49) offering improved headloss performance. This improvement was attributed to the varied packing of the filter bed and associated porosity variations throughout the filter. The objectives of the pilot study were to provide understanding of scale-up factors and adjust these theories with real variable clarified water. Real water chemistry is too complex to model and enabled experiments more typical of the variation that a rapid gravity filter would encounter. The pilot plant is 0.07 % the plan area of a full scale filter compared to the 0.01 % of the laboratory columns. Results corroborated the laboratory work on the effect of extreme particle shapes on filter performance. The pilot study also highlighted problems from floc carry over with the use of clarified water and quantified the impact it had on filtration performance. In this case floc carryover changed the performance of the pilot plant results significantly. Thus an overall conclusion from the work was that an integrated design approach to filters, to account for the clarifier type the likelihood of floc carryover and raw water anticipated could be further researched. There were also limitations to the current monitoring equipment that could not quantitatively measure the floc carryover because of large particle size.

Download or read book Recent Progress in Slow Sand and Alternative Biofiltration Processes written by Rolf Gimbel and published by IWA Publishing. This book was released on 2006-03-31 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt: Slow sand filtration is typically cited as being the first "engineered" process in drinking-water treatment. Proven modifications to the conventional slow sand filtration process, the awareness of induced biological activity in riverbank filtration systems, and the growth of oxidant-induced biological removals in more rapid-rate filters (e.g. biological activated carbon) demonstrate the renaissance of biofiltration as a treatment process that remains viable for both small, rural communities and major cities. Biofiltration is expected to become even more common in the future as efforts intensify to decrease the presence of disease-causing microorganisms and disinfection by-products in drinking water, to minimize microbial regrowth potential in distribution systems, and where operator skill levels are emphasized. Recent Progress in Slow Sand and Alternative Biofiltration Processes provides a state-of-the-art assessment on a variety of biofiltration systems from studies conducted around the world. The authors collectively represent a perspective from 23 countries and include academics, biofiltration system users, designers, and manufacturers. It provides an up-to-date perspective on the physical, chemical, biological, and operational factors affecting the performance of slow sand filtration (SSF), riverbank filtration (RBF), soil-aquifer treatment (SAT), and biological activated carbon (BAC) processes. The main themes are: comparable overviews of biofiltration systems; slow sand filtration process behavior, treatment performance and process developments; and alternative biofiltration process behaviors, treatment performances, and process developments.

Download or read book Wastewater Filtration written by and published by . This book was released on 1977 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Drinking Water Handbook written by Frank R. Spellman and published by CRC Press. This book was released on 2024-07-09 with total page 361 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new edition of The Drinking Water Handbook is thoroughly revised and updated and includes a comprehensive discussion of "forever chemicals," as well as the herbicide atrazine in drinking water. It presents the latest coverage of contaminants in water, such as personal care products and pharmaceuticals (PCPPs) and endocrine disruptors, and examines the security requirements for waterworks and ancillary procedures. It examines the process of producing drinking water— from sources of water, to the purification process, through distribution systems to the tap, and then to the actual use and reuse of water. It also presents the latest advancements in treatment technologies and reviews new laws and regulations related to drinking water as well. Thoroughly revised and updated, including a comprehensive discussion of the Flint, Michigan, lead contamination event. Offers a systematic, easy-to-understand explanation of the many processes employed to make water safe to drink. Examines what is being done to mitigate growing concerns about disinfection by-products and PPCPs in water. Provides coverage of individual contaminants found in water. Investigates the physical, chemical, and microbiological parameters that must be modified to produce potable water.

Download or read book Integrated Design and Operation of Water Treatment Facilities written by Susumu Kawamura and published by John Wiley & Sons. This book was released on 2000-09-14 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt: Completely up-to-date coverage of water treatment facility design and operation This Second Edition of Susumu Kawamura's landmark volume offerscomprehensive coverage of water treatment facility design, from thebasic principles to the latest innovations. It covers a broadspectrum of water treatment process designs in detail and offersclear guidelines on how to choose the unit, process, and equipmentthat will maximize overall efficiency and minimize maintenancecosts. This book also explores many important operational issuesthat affect today's plant operators and facility designers. This new edition introduces several new subjects, including valueengineering, watershed management, dissolved air flotation process,filtered reservoir (clearwell) design, and electrical systemdesign. It provides expanded and updated coverage of objectives forfinished water quality, instrumentation and control, disinfectionprocess, ozonation, disinfection by-product control, the GACprocess, and the membrane filtration process. Other importantfeatures of this Second Edition include: * Practical guidance on the design of every water treatment plantcomponent * New information on plant layout, cost estimation, sedimentationissues, and more * English and SI units throughout * Help in designing for compliance with water treatment-relatedgovernment regulations Supplemented with hundreds of illustrations, charts, and tables,Integrated Design and Operation of Water Treatment Facilities,Second Edition is an indispensable, hands-on resource for civilengineers and managers, whether working on new facilities orredesigning and rebuilding existing facilities.

Download or read book Technologies for Upgrading Existing Or Designing New Drinking Water Treatment Facilities written by and published by . This book was released on 1990 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Assessment of Alternative Filter Media in Single and Dual Media Configuration for Drinking Water Treatment written by Anna Cescon and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Water Treatment and Pathogen Control written by LeChevallier M.W. and published by World Health Organization. This book was released on 2004-09-24 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation This publication provides a critical analysis of the literature on removal and inactivation of pathogenic microbes in water to aid the water quality specialist and design engineer in making decisions regarding microbial water quality.

Download or read book Twort s Water Supply written by Malcolm J. Brandt and published by Butterworth-Heinemann. This book was released on 2016-09-03 with total page 968 pages. Available in PDF, EPUB and Kindle. Book excerpt: Twort's Water Supply, Seventh Edition, has been expanded to provide the latest tools and techniques to meet engineering challenges over dwindling natural resources. Approximately 1.1 billion people in rural and peri-urban communities of developing countries do not have access to safe drinking water. The mortality from diarrhea-related diseases amounts to 2.2 million people each year from the consumption of unsafe water. This update reflects the latest WHO, European, UK, and US standards, including the European Water Framework Directive. The book also includes an expansion of waste and sludge disposal, including energy and sustainability, and new chapters on intakes, chemical storage, handling, and sampling. Written for both professionals and students, this book is essential reading for anyone working in water engineering. - Features expanded coverage of waste and sludge disposal to include energy use and sustainability - Includes a new chapter on intakes - Includes a new chapter on chemical storage and handling

Download or read book The Drinking Water Handbook Second Edition written by Frank R. Spellman and published by CRC Press. This book was released on 2012-05-22 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: When you open the tap to fill your glass with drinking water, you expect the water to be of good quality. But is the water from your tap really safe? The second edition of an industry-wide bestseller, The Drinking Water Handbook explains the many processes employed to make water safe to drink. Starting at the source, it evaluates the quality control of drinking water through treatment and distribution to the tap, and its use and reuse by the consumer. What’s in Your Glass of Water? Engaging and accessible, the handbook covers important concepts and regulations and identifies current problems with the water supply. In addition to the traditional physical, chemical, and microbiological parameters that affect water quality, it discusses trihalomethanes, Cryptosporidium, viruses, carcinogens, pharmaceuticals and personal care products (PPCPs), and other pollutants. Solutions for Safer Drinking Water The book also addresses the challenges faced by practitioners striving to provide the best drinking water quality to the consumer. It outlines techniques and technologies for monitoring and water treatment, from preliminary screening to filtration and disinfection, as well as advanced processes for specialized water problems. Recognizing the importance of protecting water infrastructure, the authors include a comprehensive chapter on security requirements for waterworks. This user-friendly handbook puts technical information about drinking water in the hands of the general public, sanitary and public works engineers, public health administrators, water treatment operators, and students. Thoroughly updated to reflect current science and technologies, it takes a close look at what can be found in many tap water supplies and the measures taken to ensure the health and well-being of consumers. What’s New in this Edition Updates to every chapter, reflecting advances in the field Expanded material on sick water related to PPCPs Discussion of the latest treatment technologies Coverage of individual contaminants Current regulations related to drinking water

Download or read book Cost Estimating Manual for Water Treatment Facilities written by Susumu Kawamura and published by Wiley. This book was released on 2008-09-16 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: NOTE TO THE READER: All forms and material that were previously on a CD-ROM that accompanied this book have been moved to the following web site: http://booksupport.wiley.com Tested-and-proven techniques for quick, accurate estimates Here is the first manual that guides engineers, planners, and contractors through the process of estimating the cost of building water treatment facilities. Based on more than eighty years of the two authors' collective experience, the Cost Estimating Manual for Water Treatment Facilities not only enables you to arrive at a dependable estimate, it shows you how to do it quickly with a minimum of information and supporting data. In order to ensure reliability, the authors have compiled and analyzed the results from their own construction cost estimates for more than 500 projects as well as the results from many other engineers and contractors. The manual identifies forty-three treatment processes, nine types of water treatment plants, plus five additional types of advanced water treatment plants. The authors then demonstrate how to calculate costs for each element, accounting for needed mark-ups and allowances in order to arrive at the total plant construction cost. To help you make your own estimates, the manual provides: Examples of cost estimates for different water treatment processes Historical data from several public agencies Sample tables for 10 mgd and 100 mgd product water flow rates for each type of treatment plant Website access with Excel spreadsheets that enable you to perform estimates using your own data Now that the Cost Estimating Manual for Water Treatment Facilities is available, you no longer have to rely on hunches and anecdotal information; you have a proven, scientific method that leads to reliable estimates.

Download or read book Alternative Filter Media for Use in the Recirculating Sand Filter System written by David Joseph Ralph and published by . This book was released on 1980 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Knowledge Review written by and published by . This book was released on 2005 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Guidance Manual for Compliance with the Filtration and Disinfection Requirements for Public Water Systems Using Surface Water Sources written by David J. Hiltebrand and published by . This book was released on 1991 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt: This manual suggests design operating and performance criteria for specific surface water quality conditions to provide the optimum protection from microbiological contaminants.

Download or read book Environmental Pollution Control Alternatives written by and published by . This book was released on 1990 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Filter Maintenance and Operations Guidance Manual written by Gary S. Logsdon and published by American Water Works Association. This book was released on 2002 with total page 758 pages. Available in PDF, EPUB and Kindle. Book excerpt: This manual was developed to provide guidance on techniques and procedures for maintanance and operation of water filtration plants and to provide background information and advice on where to find additional information.

Download or read book Basic Water Treatment written by Chris Binnie and published by Inst of Civil Engineers Pub. This book was released on 2013 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: Basic Water Treatment is an essential reference on all aspects of water quality and treatment principles and processes. This accessible introduction and practical guide to water treatment focuses on the issues of most interest to practising engineers, summarising the key issues and criteria in short and accessible sections, with additional theory to explain and support the treatment processes considered. Basic Water Treatment is an essential resource for water engineers at all levels a textbook for students, a handbook for young engineers or chemists, and an indispensable guide full of practical information for the established practitioner. Fully revised and extensively updated by two of the world s leading experts in the field, taking into account current UK, EU, and USA water-quality standards and treatment technologies. This fifth edition of a best-selling text provides comprehensive contemporary practical guidance and remains the definitive reference for all those involved in water-treatment systems."