Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 19 of 19 for “"Drinking Water Distribution System"”.
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Nitrification Investigation And Modeling In The Chloraminated Drinking Water Distribution System
… papers concerning nitrification in chloraminated drinking water distribution systems in a one and a half year field study. Seven finished waters were produced from different treatment processes and distributed to eighteen pilot distribution systems (PDSs) that were made pipes taken from actual …
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The role of biofilms in Legionella pneumophila transmission in drinking water distribution system
Biofilms in drinking water distribution systems (DWDS) or premise plumbing systems could facilitate the persistence and transmission of pathogenic Legionella pneumophila (L. pneumophila), thus raise human health concerns. L. pneumophila cells can accumulate in biofilms, be protected from …
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Role of Extracellular Polymeric Substances (EPS) on Biofilm Disinfection in a Model Drinking Water Distribution System
Biofilms are undesirable but ubiquitous in drinking water systems. This study investigated the role of extracellular polymeric substances (EPS) in the biofilm life cycle, including planktonic cells, attached biofilm, detached biofilm clusters and redistributed biofilm, in a model distribution …
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Analysis of Fate and Transport of E. coli in Chlorinated Drinking Water Distribution System in the Presence of Natural Organic Matter
<p>Contamination of drinking water distribution systems can affect the public health adversely. Intentional intrusion of contaminants into the drinking water distribution systems have been a growing concern. In order to protect the public health, an effort is made to answer the need for improvising …
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Presence of potentially pathogenic heterotrophic plate count (HPC) bacteria occurring in a drinking water distribution system in the North-West Province, South Africa
… of heterotrophic plate count (HPC) bacteria in drinking water. These HPC may have potential pathogenic features, enabling them to cause disease. It is especially alarming amongst individuals with a weakened immune system. South Africa, the country with the highest incidents of HIV positive …
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Water Quality Variations During Nitrification In Drinking Water Distribution Systems
… documents the relationship among the major water quality parameters during a nitrification episode. Nitrification unexpectedly occurred in a chloraminated pilot drinking water distribution system practicing with a 4.0 mg/L as Cl2 residual dosed at 4.5:1 Cl2:NH3-N. Surface, ground and sea …
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Evaluating Coliform Monitoring Strategies for Contamination Scenarios in a Distribution System Model
Large public water utilities currently are required to take several 100 mL water samples every month in their distribution systems and to test these samples for the presence of total coliforms to comply with the Total Coliform Rule. How and where they take these samples is not specified. The Total …
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Effects of installing point-of-use filters intended for lead removal on drinking water quality
Defects in the aging drinking water distribution system can lead to elevated concentrations of toxic metals and harmful microorganisms that pose a risk to human health. Premise plumbing systems can be sites of elevated lead concentrations from lead service lines and are favorable environments for …
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Impact of Chloramination on the Development of Oligotrophic Biofilms
… in Center for Disease Control (CDC) reactor systems with PVC coupons as the substratum and groundwater as the seeding and growth nutrient. To compare biofilm development under disinfection against its natural development, two CDC reactors (treatment and control) were operated. In the …
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Chloramine and MIEX control of disinfection by-products formed from an alluvial aquifer water source
… the formation of these DBPs varies with the water quality and/or the treatment process. The compliance of TTHMs may become a major issue in most facilities which use ground water as their raw water and apply softening as the primary treatment goal. For this kind of facility, however, …
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Impact of Polymeric Plumbing Materials on Drinking Water Quality and Aesthetics
… common in home plumbing and other parts of the drinking water distribution system. Many taste and odor complaints in drinking water are known to originate from contact of water with materials. The ability of polymer pipes used in home plumbing to affect drinking water quality and aesthetics was …
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Assessing Biofiltration Pretreatment for Ultrafiltration Membrane Processes
… low-alkalinity, organic-laden surface water downstream of conventional coagulation-clarification and upstream of an ultrafiltration (UF) membrane process was assessed for its treatment effectiveness. The impact of biofiltration pretreatment on UF membrane performance was evaluated …
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Role of disinfectants and pipe materials on bacterial adhesion onto biofilms
… and Legionella pneumophila in premise plumbing system. The fact that biofilms can protect attached bacterial cells from disinfectants raises rudimentary questions regarding interactions of bacterial cells with biofilm surfaces. Consequently, the main objectives of this study were to: 1) …
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Understanding the microbiota in drinking water distribution networks – from municipal to indoor water supply systems
"A drinking water distribution system can be viewed as an ecosystem that is comprised of diverse microorganisms interacting with each other and the environment. These microorganisms are central to water quality integrity during distribution. This study investigated the diversity, structure, and …
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Determination of the Influence of Polyurethane Lining on Potable Water Quality
The corrosion of the drinking water distribution system is a serious problem in the United States. The annual cost to repair damages related to corrosion for public utilities in the United States are estimated at $22 billion. Polyurethane can be used as an in situ pipe liner which reduces the …
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Comparison of deterministic, stochastic and fuzzy logic uncertainty modelling for capacity extension projects of DI/WFI pharmaceutical plant utilities with variable/dynamic demand
… on the example of pharmaceutical high purity water (HPW) utility systems. The goal of this study was to find the most appropriate method modelling uncertainty in industrial scale HPW systems. The results provide evidence which suggests that stochastic methods are superior to the methods of FL …
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Accumulation of Lead by Biofilms in Drinking Water Distribution Systems
… in Flint, MI, indicate that lead exposure from drinking water is a major health concern in the United States. Over six million lead service lines are still in use in the United States, and a universal protocol to safely remove these lead service lines from drinking water distribution systems has …
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The Effect Of Free Chlorine And Chloramines On Lead Release In A Distribution System
Total lead release in drinking water in the presence of free chlorine and chloramine residuals was investigated in field, laboratory and fundamental investigations for finished waters produced from ground (GW), surface (SW), saline (RO) and blended (B) sources. Field investigations found more total …
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Occurrence and Control of Microbial Contaminants of Emerging Concern through the Urban Water Cycle: Molecular Profiling of Opportunistic Pathogens and Antibiotic Resistance
In an era of pervasive water stress caused by population growth, urbanization, drought, and climate change, limiting the dissemination of microbial contaminants of emerging concern (MCECs) is of the utmost importance for the protection of public health. In this dissertation, two important subsets …