Download or read book Impact of Water Quality Changes in the Distribution System on Disinfection Efficacy microform written by Dawne M. (Dawne Marion) Skinner and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 2003 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Impact of Distribution System Water Quality on Disinfection Efficacy written by Hé́lène Baribeau and published by American Water Works Association. This book was released on 2005 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Assesses the impact of dynamic water quality conditions in the distribution system on the inactivation of microorganisms in bulk water. Addresses questions about the usefulness of maintaining a secondary residual and the target level to be maintained. Bridges research related to distribution system water quality with that of microbial inactivation.
Download or read book Long Term Effects of Disinfection Changes on Water Quality written by John E. Dyksen and published by American Water Works Association. This book was released on 2007 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: In response to many U.S. water utilities that are considering changing disinfectants from chlorine to alternative disinfectants, this research has been undertaken to gain knowledge of long-term effects.
Download or read book Distribution System Water Quality Challenges in the 21st Century written by Michael J. MacPhee and published by . This book was released on 2005 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: Offering a high-level view of key distribution system water quality issues that utilities will confront in the coming decades, and a new view of an integrated treatment process, this book covers such topics as microbial regrowth and recontamination, risks associated with release of trace metals from system scale, and impacts of secondary disinfection practices. This resource targets water utility managers, water quality professionals, policy makers, regulators, consultants, and educators.
Download or read book Microbial Quality of Water Supply in Distribution Systems written by Edwin E. Geldreich and published by CRC Press. This book was released on 2020-07-26 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hidden problems, buried deep in the pipe networks of water distribution systems, are very serious potential threats to water quality. Microbial Quality of Water Supply in Distribution Systems outlines the processes and issues related to the degradation of water quality upon passage through networks of pipes, storage reservoirs, and standpipes on its way to the consumer. The risks associated with biofilm accumulation, bacteria, and other contaminants are discussed in great detail. In addition to its excellent microbiological coverage of organisms in drinking water and biofilms in distribution systems, Microbial Quality of Water Supply in Distribution Systems provides clear treatments of the technical and public communication issues most commonly affecting the quality of water and water supply systems. The inclusion of numerous case histories in this new book makes it a complete reference source for anyone concerned with water quality and water distribution systems.
Download or read book The Impact of a Change in Disinfectants on the Water Quality of a Distribution System written by Nak-hyun Baek and published by . This book was released on 1994 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Water Quality Decay and Pathogen Survival in Drinking Water Distribution Systems written by Precious Thabisile Biyela and published by . This book was released on 2010 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: The deterioration of drinking-water quality within distribution systems is a serious cause for concern. Extensive water-quality deterioration often results in violations against regulatory standards and has been linked to water-borne disease outbreaks. The causes for the deterioration of drinking water quality inside distribution systems are not yet fully understood. Mathematical models are often used to analyze how different biological, chemical, and physical phenomena interact and cause water quality deterioration inside distribution systems. In this dissertation research I developed a mathematical model, the Expanded Comprehensive Disinfection and Water Quality (CDWQ-E) model, to track water quality changes in chloraminated water. I then applied CDWQ-E to forecast water quality deterioration trends and the ability of Naegleria fowleri (N.fowleri), a protozoan pathogen, to thrive within drinking-water distribution systems. When used to assess the efficacy of substrate limitation versus disinfection in controlling bacterial growth, CDWQ-E demonstrated that bacterial growth is more effectively controlled by lowering substrate loading into distribution systems than by adding residual disinfectants. High substrate concentrations supported extensive bacterial growth even in the presence of high levels of chloramine. Model results also showed that chloramine decay and oxidation of organic matter increase the pool of available ammonia, and thus have potential to advance nitrification within distribution systems. Without exception, trends predicted by CDWQ-E matched trends observed from experimental studies. When CDWQ-E was used to evaluate the ability N. fowleri to survive in finished drinking water, the model predicted that N. fowleri can survive for extended periods of time in distribution systems. Model results also showed that N. fowleri growth depends on the availability of high bacterial densities in the 105 CFU/mL range. Since HPC levels this high are rarely reported in bulk water, it is clear that in distribution systems biofilms are the prime reservoirs N. fowleri because of their high bacterial densities. Controlled laboratory experiments also showed that drinking water can be a source of N. fowleri, and the main reservoir appeared to be biofilms dominated by bacteria. When introduced to pipe-loops N. fowleri successfully attached to biofilms and survived for 5 months.
Download or read book Characterizing Microbial Water Quality in Reclaimed Water Distribution Systems written by R. Narasimhan and published by IWA Publishing. This book was released on 2006-06-30 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: Historically, reclaimed water systems met water quality and public health related standards at the end of the treatment facility prior to entering the distribution system. However, water quality within the reclaimed water distribution system can significantly change and affect end uses due to changes in levels of color, odor, and biofilm growth. Operations staff need guidance to help them optimize the reclaimed water quality in the distribution system throughout the year. The objectives of this project were to: characterize the nature and extent of water quality deterioration in reclaimed water distribution systems, including microbial fouling, regrowth, impact to the end user, and impact on reuse and other related regulations; identify pertinent water quality issues in relationship to degradation as it is conveyed to reuse customers; develop general guidance for use by reclaimed water utilities in identifying and assessing problems; and provide options for controlling regrowth including regulating detention time, flushing, and optimization of disinfectants. The final report includes a summary of state reclaimed water regulations and federal guidelines, and other related regulations. The research team put together a final report that provides general guidance for use by reclaimed water utilities in assessing and solving potential problems. Guidance for operation, monitoring, and maintenance of reclaimed water systems to improve quality for end users. Biofilm control methods such as pipeline flushing, shock chlorination, and intermittent use of chloramine disinfectant are discussed. The research also addresses methods for identifying microbially induced corrosion issues and methods to optimize operations through the use of monitoring and modeling activities. Disinfectant residual criteria for reclaimed water systems are presented to assist system operators.
Download or read book Factors Affecting Microbial Inactivation Kinetics in Disinfected Drinking Water microform written by Linda Wojcicka and published by Library and Archives Canada = Bibliothèque et Archives Canada. This book was released on 2004 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microbial quality may degrade in drinking water distribution systems despite maintaining a disinfectant residual. This study attempted to explain the survival of microorganisms in disinfected environments. Two major hypotheses were tested. First, organisms isolated from disinfected environments were studied to determine if they were inherently more resistant to further disinfection, compared to organisms which have never come into contact with disinfectants. It was found that antecedent growth conditions were more important for resistance to disinfectants than the environmental origin. Second, the impact of particulate matter on disinfection was investigated. It was hypothesized that particulate matter protected microorganisms from disinfection, and it was expected that enmeshment of organisms within particles would protect microorganisms from not only chemical, but also physical disinfectants. No conclusive evidence was found to suggest the particles used in these experiments had a significant impact on inactivation kinetics.
Download or read book Studies on the Influence of Chemical Disinfection Ultraviolet Irradiation and Pipe Matrix on Biofilm Composition in Drinking Water Distribution Systems written by Fernando M. G. Matias and published by . This book was released on 2007 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Comprehensive Disinfection and Water Quality Model for Drinking Water Distribution System written by John Edward Woolschlager and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1991 with total page 884 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1991 with total page 1194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2009 with total page 810 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1978 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book EPA 570 9 written by and published by . This book was released on 1982-10 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book EPA Publications Bibliography written by United States. Environmental Protection Agency and published by . This book was released on 1994 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt:
