Download or read book Application of Microbial Risk Assessment Techniques to Estimate Risk Due to Exposure to Reclaimed Waters written by Adam W. Olivieri and published by . This book was released on 2007 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Microbial Risk Assessment Techniques and Applications written by J. A. Soller and published by IWA Publishing. This book was released on 2003-12-01 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: This investigation reviewed and evaluated methodologies used for microbial risk assessment with respect to their applicability for reclaimed water applications. The investigation was comprised of five primary components: a comprehensive database of articles, reports and books describing microbial risk assessment methodologies was established and reviewed. Risk assessment techniques and models were identified for estimating the public health risk from exposure to microorganisms via reclaimed water applications. Two models were identified for further evaluation: a static (individual based) and a dynamic (population based). In the third component, the two models were evaluated to differentiate between the conditions under which models predict similar and substantially different estimations of risk. Through numerical simulation, exposure/pathogen combinations were identified when it may be appropriate to use the less complex, static model. Case study risk assessment scenarios demonstrated the model selection process for three realistic, yet hypothetical reclaimed water scenarios.The fourth component presents a constraint analysis for existing reuse regulations. The constraint analysis is carried out by documenting the existing reuse regulations. The constraint analysis is carried out by documenting the existing regs in three states for landscape irrigation and uses that comparison as a starting point to identify how microbial risk assessment may be useful within the context of existing and potential future water reuse regulations. The investigation concludes by identifying criteria for a computer interface that would allow regulatory and/or municipal agencies/utilities to take advantage of the analysis discussed in the report. This publication can also be purchased and downloaded via Pay Per View on Water Intelligence Online - click on the Pay Per View icon below

Download or read book Quantitative Microbial Risk Assessment written by Charles N. Haas and published by John Wiley & Sons. This book was released on 2014-06-09 with total page 439 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides the latest QMRA methodologies to determine infection risk cause by either accidental microbial infections or deliberate infections caused by terrorism • Reviews the latest methodologies to quantify at every step of the microbial exposure pathways, from the first release of a pathogen to the actual human infection • Provides techniques on how to gather information, on how each microorganism moves through the environment, how to determine their survival rates on various media, and how people are exposed to the microorganism • Explains how QMRA can be used as a tool to measure the impact of interventions and identify the best policies and practices to protect public health and safety • Includes new information on genetic methods • Techniques use to develop risk models for drinking water, groundwater, recreational water, food and pathogens in the indoor environment

Download or read book Quantitative Microbial Risk Assessment written by Charles N. Haas and published by John Wiley & Sons. This book was released on 2014-07-08 with total page 439 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides the latest QMRA methodologies to determine infection risk cause by either accidental microbial infections or deliberate infections caused by terrorism • Reviews the latest methodologies to quantify at every step of the microbial exposure pathways, from the first release of a pathogen to the actual human infection • Provides techniques on how to gather information, on how each microorganism moves through the environment, how to determine their survival rates on various media, and how people are exposed to the microorganism • Explains how QMRA can be used as a tool to measure the impact of interventions and identify the best policies and practices to protect public health and safety • Includes new information on genetic methods • Techniques use to develop risk models for drinking water, groundwater, recreational water, food and pathogens in the indoor environment

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 Evaluation of Microbial Risk Assessment Techniques and Applications written by Jeffrey A. Soller and published by . This book was released on 2004-01-01 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Quantitative Microbial Risk Assessment for Sustainable Water Resources written by Kerry Ann Hamilton and published by . This book was released on 2016 with total page 846 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis evaluates the microbiological health risks of using the sustainable water resources roof-harvested rainwater and reclaimed water. This research was accomplished by performing six tasks: 1) prioritizing pathogens for exploration; 2) conducting a screening study of opportunistic pathogens in rainwater tanks identified in task 1 in Brisbane, Australia; 3) conducting a longitudinal study of opportunistic pathogens for contaminated tanks identified in task 2; 4) developing a series of new dose response models necessary to conduct a risk assessment; 5) conducting a quantitative microbial risk assessment (QMRA) for two index opportunistic pathogens in roof-harvested rainwater; and 6) conducting a QMRA for an opportunistic pathogen in reclaimed water in partnership with a large field and laboratory study conducted by American Water. Decentralized, alternative, or otherwise “sustainable” water resources are growing in popularity as the world’s water resources are strained due to population growth, climate change, and water scarcity. These resources bring new challenges for the water industry in terms of maintaining water quality standards and minimizing adverse impacts. Increased attention has been devoted to opportunistic pathogens due to their growing importance as a portion of the waterborne disease burden in many countries and need to assess their associated health risks. The two systems investigated in this thesis are roof-harvested rainwater (RHRW) systems and reclaimed water. Roof-harvested rainwater systems are used in many parts of the world to collect rainwater that falls on roof surfaces in a tank or barrel. This rainwater is then used for a variety of potable or non-potable purposes. Reclaimed water is wastewater reused for beneficial purposes with treatment, where the level of treatment depends on the reuse application. Both types of water systems can foster environments that are conducive to the occurrence of opportunistic pathogens. Opportunistic pathogens are microorganisms that are pathogenic under certain sets of circumstances and typically affect children, the elderly, and immune-compromised hosts rather than healthy individuals. The two opportunistic pathogens that are the focus of this work are Legionella pneumophila and Mycobacterium avium complex (MAC). L. pneumophila causes infection and respiratory disease through inhalation of aqueous aerosols, while MAC can causes infection or disease through inhalation or ingestion. Due to the use of RHRW for both potable and non-potable purposes, and the use of reclaimed water for potable purposes that generate large-scale aerosols (such as cooling tower mists), the potential for public health risk exists as a result of human contact with these water sources. A QMRA is therefore needed to assess risk and prioritize risk management and data gathering needs for both of these pathogens under a variety of scenarios. This thesis presents a large-scale field study of RHRW in Brisbane, Australia, where RHRW is used on a large scale due to aggressive droughts in the region. Molecular biology methods (qPCR) and culture-based methods were used to screen tanks for opportunistic pathogens, and a subset of contaminated tanks was chosen for a six-month follow-up study. A survey of rainwater tank owner use and maintenance practice was conducted. Additionally, an analysis of the correlation among microorganisms and between microorganisms and meteorological factors was performed to inform risk management approaches. A major barrier to conducting a QMRA for MAC has been the development of a risk assessment framework and dose response models. These models have been developed for this work and as a result, a QMRA is performed for RHRW using Monte Carlo simulation and sensitivity analysis. A similar modeling approach is used for assessing risks from toilet flushing, spray irrigation, and cooling tower use for reclaimed water. As a result, appropriate uses for RHRW are designated and appropriate setback distances for cooling towers and spray irrigation systems are proposed for reclaimed water.

Download or read book Drinking Water Distribution Systems written by National Research Council and published by National Academies Press. This book was released on 2007-01-22 with total page 405 pages. Available in PDF, EPUB and Kindle. Book excerpt: Protecting and maintaining water distributions systems is crucial to ensuring high quality drinking water. Distribution systems-consisting of pipes, pumps, valves, storage tanks, reservoirs, meters, fittings, and other hydraulic appurtenances-carry drinking water from a centralized treatment plant or well supplies to consumers' taps. Spanning almost 1 million miles in the United States, distribution systems represent the vast majority of physical infrastructure for water supplies, and thus constitute the primary management challenge from both an operational and public health standpoint. Recent data on waterborne disease outbreaks suggest that distribution systems remain a source of contamination that has yet to be fully addressed. This report evaluates approaches for risk characterization and recent data, and it identifies a variety of strategies that could be considered to reduce the risks posed by water-quality deteriorating events in distribution systems. Particular attention is given to backflow events via cross connections, the potential for contamination of the distribution system during construction and repair activities, maintenance of storage facilities, and the role of premise plumbing in public health risk. The report also identifies advances in detection, monitoring and modeling, analytical methods, and research and development opportunities that will enable the water supply industry to further reduce risks associated with drinking water distribution systems.

Download or read book Issues in Potable Reuse written by Committee to Evaluate the Viability of Augmenting Potable Water Supplies with Reclaimed Water and published by National Academies Press. This book was released on 1998-08-06 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: A small but growing number of municipalities are augmenting their drinking water supplies with highly treated wastewater. But some professionals in the field argue that only the purest sources should be used for drinking water. Is potable reuse a viable application of reclaimed water? How can individual communities effectively evaluate potable reuse programs? How certain must "certain" be when it comes to drinking water safety? Issues in Potable Reuse provides the best available answers to these questions. Useful to scientists yet accessible to concerned lay readers, this book defines important terms in the debate and provides data, analysis, and examples of the experience of municipalities from San Diego to Tampa. The committee explores in detail the two major types of contaminants: Chemical contaminants. The committee discusses how to assess toxicity, reduce the input of contaminants, evaluate treatment options, manage the byproducts of disinfection and other issues. Microbial contaminants, including newly emerging waterborne pathogens. The book covers methods of detection, health consequences, treatment, and more. Issues in Potable Reuse reviews the results of six health effects studies at operational or proposed reuse projects. The committee discusses the utility of fish versus mammals in toxicology testing and covers issues in quality assurance.

Download or read book EPA 630 R written by and published by . This book was released on 1998 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Microbial Source Tracking written by Jorge W. Santo Domingo and published by Emerging Issues in Food Safety. This book was released on 2007 with total page 285 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents a state-of-the-art review of the current technology and applications being utilized to identify sources of fecal contamination in waterways. - Serves as a useful reference for researchers in the food industry, especially scientists investigating etiological agents responsible for food contamination. - Provides background information on MST methods and the assumptions and limitations associated with their use. - Covers a broad range of topics related to MST, including environmental monitoring, public health and national security, population biology, and microbial ecology. - Offers valuable insights into future research directions and technology developments.

Download or read book Stochastic Modelling of Drinking Water Treatment in Quantitative Microbial Risk Assessment written by Patrick Willem Maria Hubertus Smeets and published by . This book was released on 2008 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Management of Legionella in Water Systems written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2020-02-20 with total page 291 pages. Available in PDF, EPUB and Kindle. Book excerpt: Legionnaires' disease, a pneumonia caused by the Legionella bacterium, is the leading cause of reported waterborne disease outbreaks in the United States. Legionella occur naturally in water from many different environmental sources, but grow rapidly in the warm, stagnant conditions that can be found in engineered water systems such as cooling towers, building plumbing, and hot tubs. Humans are primarily exposed to Legionella through inhalation of contaminated aerosols into the respiratory system. Legionnaires' disease can be fatal, with between 3 and 33 percent of Legionella infections leading to death, and studies show the incidence of Legionnaires' disease in the United States increased five-fold from 2000 to 2017. Management of Legionella in Water Systems reviews the state of science on Legionella contamination of water systems, specifically the ecology and diagnosis. This report explores the process of transmission via water systems, quantification, prevention and control, and policy and training issues that affect the incidence of Legionnaires' disease. It also analyzes existing knowledge gaps and recommends research priorities moving forward.

Download or read book Occupational Health and Safety in the Care and Use of Nonhuman Primates written by National Research Council and published by National Academies Press. This book was released on 2003-06-13 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of occupational health and safety constantly changes, especially as it pertains to biomedical research. New infectious hazards are of particular importance at nonhuman-primate facilities. For example, the discovery that B virus can be transmitted via a splash on a mucous membrane raises new concerns that must be addressed, as does the discovery of the Reston strain of Ebola virus in import quarantine facilities in the U.S. The risk of such infectious hazards is best managed through a flexible and comprehensive Occupational Health and Safety Program (OHSP) that can identify and mitigate potential hazards. Occupational Health and Safety in the Care and Use of Nonhuman Primates is intended as a reference for vivarium managers, veterinarians, researchers, safety professionals, and others who are involved in developing or implementing an OHSP that deals with nonhuman primates. The book lists the important features of an OHSP and provides the tools necessary for informed decision-making in developing an optimal program that meets all particular institutional needs.

Download or read book Indicators for Waterborne Pathogens written by National Research Council and published by National Academies Press. This book was released on 2004-06-19 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent and forecasted advances in microbiology, molecular biology, and analytical chemistry have made it timely to reassess the current paradigm of relying predominantly or exclusively on traditional bacterial indicators for all types of waterborne pathogens. Nonetheless, indicator approaches will still be required for the foreseeable future because it is not practical or feasible to monitor for the complete spectrum of microorganisms that may occur in water, and many known pathogens are difficult to detect directly and reliably in water samples. This comprehensive report recommends the development and use of a "tool box" approach by the U.S Environmental Protection Agency and others for assessing microbial water quality in which available indicator organisms (and/or pathogens in some cases) and detection method(s) are matched to the requirements of a particular application. The report further recommends the use of a phased, three-level monitoring framework to support the selection of indicators and indicator approaches.Â

Download or read book Greywater Reuse written by Amit Gross and published by CRC Press. This book was released on 2015-03-26 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: Greywater Reuse examines the features and implications of greywater reuse scientifically, quantitatively, and thoroughly. Based on the authors' extensive studies of treatment facilities in urban and rural environments, development of greywater treatment systems, and research of potential environmental and health risks posed by greywater at differen

Download or read book Science and Decisions written by National Research Council and published by National Academies Press. This book was released on 2009-03-24 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: Risk assessment has become a dominant public policy tool for making choices, based on limited resources, to protect public health and the environment. It has been instrumental to the mission of the U.S. Environmental Protection Agency (EPA) as well as other federal agencies in evaluating public health concerns, informing regulatory and technological decisions, prioritizing research needs and funding, and in developing approaches for cost-benefit analysis. However, risk assessment is at a crossroads. Despite advances in the field, risk assessment faces a number of significant challenges including lengthy delays in making complex decisions; lack of data leading to significant uncertainty in risk assessments; and many chemicals in the marketplace that have not been evaluated and emerging agents requiring assessment. Science and Decisions makes practical scientific and technical recommendations to address these challenges. This book is a complement to the widely used 1983 National Academies book, Risk Assessment in the Federal Government (also known as the Red Book). The earlier book established a framework for the concepts and conduct of risk assessment that has been adopted by numerous expert committees, regulatory agencies, and public health institutions. The new book embeds these concepts within a broader framework for risk-based decision-making. Together, these are essential references for those working in the regulatory and public health fields.