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 32 for “"wastewater treatment process"”.
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Physical and biological factors affecting oxygen transfer in the activated sludge wastewater treatment process
<p>“The activated sludge (AS) process is widely utilized for wastewater treatment due to its versatility and general resiliency, but is energy intensive, requiring aeration and mixing energy inputs to maintain the biochemical reaction and optimize treatment performance. This study is focused on …
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Elucidating the Role of Toxin-Induced Microbial Stress Responses in Biological Wastewater Treatment Process Upset
… and mechanistically-based indicator of process upset in biological wastewater treatment systems that receive sporadic shock loads of toxic chemicals. The microbial stress response is a set of conserved and unique biochemical mechanisms that an organism activates or induces under adverse …
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Anammox-based Technologies for Sustainable Mainstream Wastewater Treatment: Process Development, Microbial Ecology and Mathematical Modeling
The nitritation-anammox process is an efficient and cost-effective approach for biological nitrogen removal, but its application in treating mainstream wastewater remains a great challenge. The key objectives of this dissertation are to develop nitritation-anammox process to treat wastewater with …
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An investigation of laser light scattering for the measurement of micron size particles with application to bioflocculation
The activated sludge wastewater treatment process depends upon the formation of biological floc for effective liquid-solids separation, nutrient stabilization and sludge dewatering. Continued research into floc formation, intrafloc interactions and floc hydrodynamics is necessary for improved …
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Chemical treatment of anaerobic digester supernatant
… waste stream, to the headworks of a sewage treatment plant has long been suspected and recognized as being detrimental to the wastewater treatment process. This study was concerned with the removal of phosphorus, nitrogenous, and carbonaceous pollutants from the supernatant by use of …
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Electrical Power Generation in Microbial Fuel Cells Using Carbon Nanostructure Enhanced Anodes
… energy that is otherwise unutilized during the wastewater treatment process. MiFCs have the unique ability to treat influent waste streams while simultaneously generating power which can offset energy associated with the biological treatment of wastewater. During the oxidation of organic and …
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Advanced anaerobic treatment for energy recovery and improved process economics in the management of biorefinery wastewaters
… This study set out to improve biorefinery process economics and enable more robust techno-economic analyses (TEAs) through a focused analysis and evaluation of the wastewater treatment process and more specifically, the anaerobic treatment system design. To this effect, this study began …
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Effect of mean cell residence time on the acid hydrolytic assist activated sludge process
Handling and disposal of residual solids from wastewater treatment plants is an expensive and difficult task. The acid hydrolytic assist activated sludge process is one method of minimizing sludge production from a biological wastewater treatment process. Acid hydrolysis of waste sludge involves pH …
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Effect of mean cell residence time on the base hydrolytic assist activated sludge process
Treatment of municipal and industrial wastewaters results in the production of wastes in the form of sludge. Since the quantity and characteristics of sludge depend upon the degree of treatment, the upgrading of treatment facilities has had the effect of increasing sludge production. Since the …
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Opportunities for Nutrient Recovery from Post-Digestion Sludge Handling: Analysis and Feasibility Study Using Municipal Scale Aerobic and Anaerobic Digesters
The wastewater treatment process has developed with the primary goals of protecting receiving water ecosystems and human health. Over time, there have been continuous innovations in process efficiencies, energy recovery, and nutrient removal. Wastewater offers opportunity for recovery of resources …
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Evaluating the Fate of Manure Nitrogen in Confined Dairy Waste Operations: a Full-Scale Waste Analysis and Start-Up Protocol for an Anammox-Based Treatment Technology Applicable to Dairy Waste Management
… nitrogen from dairy waste, a novel biological wastewater treatment process, utilizing anaerobic ammonium oxidation (anammox), referred to as Oxygen-Limited Autotrophic Nitrification and Denitrification (OLAND) was examined. Due to the potential use of OLAND-based systems in dairy manure …
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]Performance of Waste Stabilisation Ponds in the Eastern Cape Province
… resource and should be used sparingly. The process of treating domestic wastewater varies from ponds to the more advanced system, namely the activated sludge system. The main purpose of wastewater treatment is the reduction of pathogenic contamination, coliform bacteria, suspended solids, …
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Development of Low Energy Aeration System For Enhanced Biological Phosphorus Removal (EBPR)
… in its population, an increase in the amount of wastewater produced is inevitable. In order to recycle this wastewater back to the environment, all nutrients should be removed. Unfortunately, removing the nutrients from wastewater is expensive due to the oxygen and chemicals requirement. …
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Algal Wastewater Treatment and Biofuel Production: An assessment of measurement methods, and impact of nutrient availability and species composition
… consumption of fossil fuels. Using algae for wastewater treatment and biofuel production offers one approach to progress towards these goals simultaneously. Algae are capable of removing nutrients from wastewater and carbon dioxide from the air, and the biomass formed in that process can be …
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Predicting and Improving the Dewaterability of Waste Activated Sludge Through Moisture Distribution Analysis
… most costly and least understood operations in wastewater treatment. While much effort has been put into streamlining operation of sludge dewatering equipment to maximize moisture removal, until recently, little attention was paid to the water within sludge. Sludge water molecules can be …
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Improving Anaerobic Digestion of Sewage Sludge Using Free Ammonia Pretreatment
… the primary sedimentation (primary sludge) and wastewater treatment process (secondary sludge) in wastewater treatment plants (WWTPs) adding a heavy economic burden for WWTPs for their disposals. Anaerobic digestion (AD) for sewage sludge treatment is adopted WWTPs globally for sludge reduction …
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Natural zeolitites in combination with struvite precipitation technology for the recovery of nutrients from agricultural wastewaters
… start turning the perception of “nutrient-rich wastewaters”, from “wastes” to dispose of, to “resources”, useful for plant nutrition, but, despite this, 80% of municipal wastewaters globally produced are still discarded in the environment, without having been subjected to any treatment. On the …
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Impact of Ammonia and Long Chain Fatty Acids on Thermophilic Anaerobic Digestion of Swine Wastes
Environmentally sound treatment of by-products in a value-adding process is an ongoing challenge in animal agriculture. Thermophilic anaerobic digestion of wastes originating from agricultural production and animal processing represents a potential waste treatment technology to address …
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Genomics-Based Characterization of the Microbial Community and Plasmidome of the Regina Wastewater Treatment Facility and the Surrounding Aquatic Environment
Wastewater produced from human activity contains high concentrations of contaminants like ammonia, pathogens, and organic compounds with high biological oxygen demand; all of which must be remediated with proper wastewater treatment prior to discharge into the environment. Most large-scale …
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Diffuser Fouling Mitigation, Wastewater Characteristics And Treatment Technology impact on Aeration Efficiency
… due to the high energy consumption of aeration processes in modern advanced wastewater treatment plants. The activated sludge wastewater treatment process is dependent on aeration efficiency which supplies the oxygen needed in the treatment process. The process is a complex heterogeneous mixture …
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