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 14 of 14 for “"pathogen removal"”.
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Pathogen Removal by Secondary and Advanced Water Reclamation for Water Reuse
… regarding the reduction of waterborne pathogens. Common pathogen log reduction requirements have been modeled after California Department of Drinking Water's 12-10-10 log reduction value (LRV) for enteric virus, Cryptosporidium and Giardia, respectively, based on raw wastewater to …
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Surface Area Mapping and Rinse Procedures of Raw Produce to Determine Effectiveness of Pathogen Removal
Bacterial pathogens on the surfaces of raw produce may be difficult to remove for identification and enumeration. The first part of this project examined whether ultrasonic treatment (40 kHz) of a rinse solution would enhance recovery of Salmonella spp. from various produce surfaces. Strawberries, …
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Quantifying uncertainty in pathogen removal, membrane integrity monitoring and health consequences in the treatment of drinking water
… Bounds Analysis, to examine uncertainty in removal of oocysts of Cryptosporidium and viruses in membranes used to treat drinking water. In chapter 2, we examined variability and uncertainty in the determination of parameters used in pressure-based direct integrity tests of hollow fiber …
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Fabrication of Macadamia Nutshell Powder-AI/Fe Metal Oxide Modified Diatomaceous Earth Composite Beads for Fluoride and Pathogen Removal Groundwater
… of drinking water due to fluoride and pathogens is a severe health hazard problem. Excess of fluoride (>1.5 mg/L) in drinking water leads to dental and skeletal fluorosis whereas the presence of pathogens in water can lead to adverse health effects, including gastrointestinal illness, …
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Evaluation of Soil Aquifer Treatment in a Lab Scale Soil Column Experiment
… providing additional environmental barriers to pathogens and contaminants in indirect potable reuse (IPR) applications. A soil column study was conducted by Hampton Roads Sanitation District in order to evaluate the effectiveness of SAT, as a component of its IPR project involving the …
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Improving Anaerobic Digestion of Sewage Sludge Using Free Ammonia Pretreatment
… solids (VS) destruction, dewaterability, pathogen removal, and its implications. In comparison to the control (without FA pretreatment), FA pretreatment (560 mg NH3-N/L, 24h) enhanced the VS destruction of primary sludge by 12%, which is related to the 31% of enhancement in hydrolysis …
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Microwave-based Pretreatment, Pathogen Fate and Microbial Population in a Dairy Manure Treatment System
… or slurry directly to the land can contribute to pathogen contamination of land, freshwater and groundwater. Thus it is important to study the fate of pathogens in diary manure anaerobic digestion systems. The goal of the project was to establish a molecular based quantitative method for pathogen …
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Evaluation of Escherichia coli O157:H7 and Salmonella enterica inactivation in water by several treatment technologies
… technologies are necessary for microbial pathogen removal from potable water. Human activities, including large industries in agriculture and manufacturing, produce massive amounts of waste that invariably end up in water supplies. There will always be a need for water treatment …
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Development of Fungal Bioreactors for Water Related Treatment and Disinfection Applications
… agricultural runoff can contain high levels of pathogenic bacteria, which pose a threat to human and ecosystem health. The use of a bioreactor containing mycelial mats of filamentous fungi is a novel treatment technology that incorporates physical, biological, and biochemical processes to remove …
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Improving performance and expanding application of denitrifying bioreactors for nutrient management in agricultural landscapes
… outperformed WC, achieving greater nitrate removal efficiency (NRE) and NO3 load removal. Total organic carbon (TOC) and hydraulic residence time (HRT) were identified as primary drivers of performance, while targeted nitrogen-cycling gene abundances (nirS, nirK, nosZI, nosZII) were …
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Nanotechnology and Biotechnology for Water Treatment: A Comparative Study
… instance, chemical precipitation for heavy metal removal is effective only when the metal concentration is low; while other methods require long contact times, are ineffective at low metal concentrations between 1-100 mg/L, and are, in most cases, expensive because they require energy or chemical …
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Optimization of Point-of-Use Water Treatment Device for Disaster Relief
… drinking water guidelines, but did not meet the pathogen reduction requirements of the U.S. EPA Guide Standard and Protocol for Testing Microbiological Water Purifiers.</p> <p>A second (Mark II) version, with internal mixing baffles and a microfilter, was developed to overcome the inability of …
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Synthesis of Zr4+/Ag+ metal oxides modified zeolite for application in fluoride and pathogens removal from water
… contaminated with high levels of fluoride and pathogens, posing a significant health risk. This dissertation aims to synthesize Zr4+/Ag+ metal oxides modified zeolite adsorbent for use in fluoride and pathogens removal from water. The first section of this research aimed at optimizing the …
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Designing Smarter Stormwater Systems at Multiple Scales with Transit Time Distribution Theory and Real-Time Control
… 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 the water quality benefits …