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 16 of 16 for “"UV disinfection"”.
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UV Disinfection between Concentric Cylinders
… of the most resistant pathogens. Ultraviolet (UV) disinfection is one of the promising methods to reach this 5-log reduction of pathogens. The absorption coefficients of juices typically vary from 10 to 40 1/cm and can be even higher depending on brand and processing conditions. Thin film …
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The UV/H2O2 advanced oxidation process in UV disinfection units : removal of selected phosphate esters by hydroxyl radical
… esters through hydroxyl radical generated by the UV/H202 process applied at a UV disinfection unit was selected for evaluation. The second-order rate constants of the reactions of two phosphate esters, Tri(2-butoxyethyl) phosphate (TBEP) and Tri-2-chloroethyl phosphate (TCEP) , with hydroxyl …
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Kinetic Modeling of Microbial Inactivation by Ultraviolet Light
Ultraviolet (UV) light reactors are currently being designed for the disinfection of water and wastewater. However, little information is available relating the effects of mixing, light intensity, reaction time, and water quality to UV disinfection efficiency. This study was designed to develop …
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Two - Stage AnMBR for Removal of UV Quenching Organic Carbon from Landfill Leachates: Feasibility and Microbial Community Analyses
… that can absorb large amounts of ultraviolet (UV) light, greatly reducing the UV transmissivity in wastewater plants using UV disinfection as the final treatment step. This interference with UV disinfection is observed even when landfill leachates constitute a very small fraction (of the order …
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Assessment of ultraviolet light disinfection efficiency of advanced wastewater treatment plant effluent
Pilot-scale operation of a 3-bank UV disinfection system for filter effluent from the Clark County Advanced Wastewater Treatment Plant has shown {dollar}>{dollar}4-log removal of seeded MS-2 coliphage at UV dosages of 80-100 milliwatt-seconds per square centimeter (mW-s/cm{dollar}\sp2{dollar}), and …
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Characterization and treatment of UV quenching substances and organic nitrogen in landfill leachates and thermal hydrolysis/anaerobic digestion centrate
… anaerobic digestion centrate can quench UV light at publicly owned treatment works (POTWs). Increased eutrophication, has led to tightening of nutrient discharge limits in some regions of the country. Biologically recalcitrant organic nitrogen, adds to effluent nitrogen making it …
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Advancing Monitoring and Mitigation of Antibiotic Resistance in Wastewater Treatment Plants and Water Reuse Systems
… study examined the effects of commonly applied disinfection processes (chlorination, chloramination, and ultraviolet irradiation [UV]) on the inactivation of antibiotic resistant pathogens and corresponding susceptible pathogens in recycled and potable water. Further, we evaluated their regrowth …
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Treatment of Landfill leachates using anion exchange resins
… the effluent. Leachates also interfere with the UV disinfection process at treatment plants. Another concern is the presence of large amounts of bio-refractory organic nitrogen in the leachates which makes it difficult for WWTPs to meet the tightening total nitrogen requirements. Studies were …
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Inactivation mechanisms of adenovirus from exposure to polychromatic ultraviolet light irradiation
Ultraviolet (UV) light is a drinking water treatment technology that has gained popularity as an alternative to control chlorine-resistant pathogens and comply with regulations on disinfection byproduct formation. Human adenovirus (HAdV) is found in water sources around the world and can cause …
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Management strategy of landfill leachate and landfill gas condensate
… Two aspects of interferences were found: one is UV quenching substances, which are bio-refractory and able to penetrate the biological treatment processes, consequently interfere the UV disinfection in WWTPs. The other one is organic nitrogen, which can pass the nitrification-denitrification …
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Profiling of Microbial Communities, Antibiotic Resistance, Functional Genes, and Biodegradable Dissolved Organic Carbon in a Carbon-Based Potable Water Reuse System
… granular active carbon (GAC) contacting, and UV disinfection. Biodegradable dissolved organic carbon (BDOC) analysis was adapted specifically as an assay relevant to assessing dissolved organic carbon biodegradability by BAC/GAC-biofilms and applied to profile biodegradable/non-biodegradable …
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Membrane Electrochemical Treatment of Landfill Leachate: Processes, Performance and Challenges
… leads to leachate formation. Persistent UV quenching substances (UVQS) in landfill leachate can affect the effectiveness of UV disinfection in municipal wastewater treatment systems when leachate co-treatment is applied. Membrane electrochemical reactor (MER) treatment was investigated to …
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Conventional and Advanced Thermal Hydrolysis in Sewage Sludge Pre-treatment
… at elevated temperatures, THP also offers sludge disinfection for safe utilisation as fertiliser and improves sludge dewaterability. However, the requirement for high reaction temperatures presents drawbacks to the technology. At temperatures exceeding 150 ℃, the colour of the sludge darkens. This …
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Numerical Simulation of an Open Channel Ultraviolet Waste-water Disinfection Reactor
The disinfection characteristics of an open channel ultra-violet (UV) wastewater disinfection reactor are investigated using a computational fluid dynamics (CFD) model. The model is based on the volume of fluid method to capture the water-air interface, the Lagrangian particle tracking method to …