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 20 of 35 for “"Fecal indicator bacteria"”.
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Modeling Fecal Indicator Bacteria and Antibiotic Resistance in Diverse Aquatic Environments
… their livestock, and their pets have caused fecal contamination of waterways throughout the United States. Understanding the sources of fecal indicator bacteria (FIB) and the environmental processes that affect them can be crucial to reducing the number of impaired streams and limiting the …
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Unveiling Origins and Dynamics of Fecal Indicator Bacteria in an Urban Creek
Urban waterways are highly vulnerable to bacterial contamination, which presents significant risks to public health and water quality. Common methodologies typically measure the total concentration of fecal indicator bacteria (FIB) but are unable to address the complex sources of contamination …
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Associations between Fecal Indicator Bacteria Prevalence and Demographic Data in Private Water Supplies in Virginia
… potential associations between concentrations of fecal indicator bacteria (e.g. coliforms, E. coli) in 831 samples collected at the point-of-use in homes with private water supply systems and homeowner-provided demographic data (e.g. homeowner age, household income, education, water quality …
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Novel Time-Integrated Quantification of Sediment-Associated Fecal Indicator Bacteria in Rural Alabama Creek with Straight Pipes
… through "straight pipes." The degree to which fecal microbes are associated with the suspended sediment load has important implications for contamination transport. Current state guidelines require periodic grab sampling to monitor surface water fecal contamination. While technically simple, …
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Fecal Matters: Fate and transport of traditional fecal indicator bacteria and source-tracking targets in septic drainfields
… quality have indicated a high prevalence of fecal coliforms and/or E. coli at the point of use. Non-point sources of pollution, including septic tank leakages and poorly constructed drain fields, have been identified as the leading risk factors associated with outbreaks in households …
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Sands and environmental conditions impact the abundance and persistence of the fecal indicator bacteria Enterococcus at recreational beaches
The marine fecal indicator Enterococcus is measured at beaches to detect fecal contamination events, and beaches are closed to bathers when Enterococcus is found to exceed the federally mandated limit. This dissertation presents evidence that beach sands are an environmental reservoir of …
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Sands and environmental conditions impact the abundance and persistence of the fecal indicator bacteria Enterococcus at recreational beaches
The marine fecal indicator Enterococcus is measured at beaches to detect fecal contamination events, and beaches are closed to bathers when Enterococcus is found to exceed the federally mandated limit. This dissertation presents evidence that beach sands are an environmental reservoir of …
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A Comparative Study of Three Bacterial Source Tracking Methods and the Fate of Fecal Indicator Bacteria in Marine Waters and Sediments
… were used to determine the fate and survival of fecal indicator bacteria (FIB) in sand and sediments. The microbial source tracking (MST) methods antibiotic resistance analysis (ARA), Bacteroides human-specific primer test, and fluorometry were compared against the FIBs to determine how reliable …
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A Comparative Microbial Composition Assessment of Stormwater, Urban Runoff and Wastewater
… was to compare two methods for assessment of fecal indicator bacteria (FIB) in urban runoff (n = 96), stormwater (n = 8), and wastewater (n = 16). We quantified the densities and reductions of E. coli and Enterococcus, in raw stormwater, treated urban off from the Santa Monica Urban Runoff …
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Factors Influencing The Ecology and Epidemiology of Microbial Indicators and Foodborne Pathogens In Surface Waters and Development of Risk Mitigations
… and epidemiology of foodborne pathogens and fecal indicator bacteria (FIB) by growing regions, sample types, scale of analysis, and detection method is essential for developing targeted mitigation strategies. This dissertation utilized quantitative research methods and statistical modeling to …
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Enteric adenovirus and coliphage as microbial indicators in Singapore's Kallang Basin
E. coli, Enterococci, and other fecal indicator bacteria have been the gold standard for assessing and regulating water quality. However, the presence of these water quality indicators often do not reflect the presence of viral pathogens, such as human enteric viruses, posing significant health …
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Development of a Risk Assessment Model to Assess TMDL Implementation Strategies
High levels of fecal indicator bacteria (e.g. E. coli) are the leading cause of identified surface water impairments in the United States. The US Clean Water Act of 1972 requires that jurisdictions establish priority rankings for impaired waterways and develop a Total Maximum Daily Load (TMDL) plan …
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Springing for Safe Water: Drinking Water Source Selection in Central Appalachian Communities
… six roadside springs. Samples were analyzed for fecal indicator bacteria and inorganic ions. Study participants also completed short surveys to inventory their perceptions of their household drinking water. The majority of participants did not trust their home tap water, indicating water …
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Does it pay to be mature? Assessing the performance of a mature bioretention cell seven years post-construction
… from the cell, which were then analyzed for fecal indicator bacteria (total coliforms, E. coli, and enterococci), total suspended solids (TSS), total nitrogen (TN), and total phosphorus (TP). To determine if denitrification is occurring within the BRC, media samples taken throughout the cell …
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Biofilms as sources of fecal bacteria contamination in the stormwater drainage system in Singapore
… was performed to examine a possible source of fecal bacteria contamination originating from within the stormwater drainage system in Singapore. The extent of fecal bacteria presence in storm drain biofilms was evaluated as a pathway for fecal bacteria contamination. In the research, biofilms …
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Fate and Transport of E. coli Through Appalachian Karst Systems
… to anthropogenic contamination, including by fecal indicator bacteria which represent a public health risk. This work designed and implemented a watershed-scale monitoring program for a 26 km2 sinking stream system in southwest Virginia to determine the fate and transport of E. coli in the …
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Designing Smarter Stormwater Systems at Multiple Scales with Transit Time Distribution Theory and Real-Time Control
… bed filtration theory and its application to fecal indicator bacteria removal in experimental laboratory-scale biofilters. This analysis is a significant step forward in our understanding of how physicochemical theories can be melded with hydrology, engineering design, and ecology to improve …
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NUTRIENT AND BACTERIA DYNAMICS OF PACKAGE TREATMENT PLANTS IN COASTAL CARTERET COUNTY, NORTH CAROLINA
Nutrient and bacteria enrichment problems are well documented in the waterways along North Carolina's coast. Surface and subsurface wastewater inputs have been documented as a source of these pollutants in a variety of coastal settings. While many studies have been conducted on the effects of …
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Recovery of Antibiotic Resistance Genes From Agricultural Runoff
… resistance genes (ARGs) and antibiotic resistant bacteria, which can pass resistance on in the livestock's manure. It is important to understand the fate of antibiotic resistance genes and resistant bacteria in the environment after land-application of manure-based amendments. The goal of this …
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