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 27 for “"Hydraulic Retention Time (HRT)"”.
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Analysis of temporal trends in southern Nevada wastewater pond parameters with an emphasis on ammonia removal
… parameters examined include pond dimensions, hydraulic retention time (HRT), alkalinity, pH, chemical oxygen demand (COD), biochemical oxygen demand (BOD), dissolved oxygen (DO), phosphorus, nitrates, and ammonia. Data on each pond and pond system are presented including pond system …
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Removal of refractory contaminants from mature landfill leachate utilizing fungi and evaluation of lignocellulosic enzymatic activity
… bed bioreactor operated at 48, 72, 96, and 120 h hydraulic retention time (HRT). Bioreactor exhibited maximum 52%, 54%, 60%, 58%, and 75% of COD, soluble COD, total carbon, total organic carbon, and color removal efficiencies at HRT 120 h and maximum enzymatic activities were 149, 27, and 16 U/L …
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Optimization of Nitrogen Removal Rate in One-Stage Reactor through Partial Nitrification Anammox Process during Direct Treatment of Poultry Litter Wastewater
… of three operating parameters including hydraulic retention time (HRT), dissolved oxygen (DO) concentration, and carbon to nitrogen (C/N) ratio. The results showed that 170 mg/L NH4+-N and 199.6 mg/L total nitrogen (TN) was removed in the continuous stirred reactor with 100% and 87.3% …
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Dam dimensions and surface porosity affect the water storage capacity of Beaver dam analogs compared to natural Beaver dams
… restoration strategies. My study compares water retention by Beaver Dam Analogs (BDAs) to natural beaver dams and undammed control reaches. I compared how dam dimensions affect the hydraulic performance of both BDAs and beaver dams, revealing gaps in research on their comparative effectiveness. …
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Developing a Mechanistic Understanding and Optimization of the Cannibal Process: Phase II
… the conventional activated sludge process. The hydraulic retention time (HRT) in the Cannibal bioreactor and the interchange rate (the percent of sludge by mass interchanged between the activated sludge system and the bioreactor on daily basis) are the two important operational parameters in the …
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In-situ passive treatment of municipal solid waste (MSW) leachate using a modified drainage leachate collection system (LCS)
… by the denitrification process. Optimum Hydraulic Retention Time (HRT) for the nitrification-denitrification system makes it economically viable for its development at a landfill site. Gas production shows low CO2 values, decreasing the potential of clogging in the Leachate Collection …
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Using Free Water Surface Constructed Wetland for the Mitigation of High PH Secondary Effluent From Municipal Wastewater Treatment Plant
… may arise, as elevated temperature and extended hydraulic retention time (HRT) could stimulate excessive algal growth that results in sustained high pH levels in the system and effluent. Amherstview Water Pollution Control Plant (WPCP) in Amherstview, Ontario frequently experiences high pH …
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A novel flow cytometry based methodology for rapid, highthroughput characterization of microbiome dynamics in anaerobic systems
… microbiome compositions caused by varying the hydraulic retention time (HRT). Potential utility of the proposed methodology has been demonstrated for monitoring the syntrophic resilience of the anaerobic microbiome perturbed under nanotoxicity.
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Using Anaerobic Co-Digestion With Addition of Municipal Organic Wastes and Pre-Treatment to Enhance Biogas Production From Wastewater Treatment Plant Sludge
… Control Plant, Kingston, ON. The effects of hydraulic retention time (HRT), organic loading rate (OLR) and digestion temperature (37°C and 55°C) on biogas production were evaluated. The best biogas production rate of 17.4±0.86 L/d and methane content 67.9±1.46% was obtained with thermophilic …
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Development of a new high-rate anaerobic process for the treatment of industrial and domestic wastewaters: the anaerobic migrating blanket reactor (AMBR)
… of granular biomass was not dependent on a hydraulic upflow pattern in the reactor, but was dependent on biomass migration over the horizontal plane of the reactor and the settling characteristics of the final compartment. To prevent acclimation of biomass in the final compartment, the flow …
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The feasibility and microbial community dynamics of using down flow hanging sponges (DHS) reactor in treating high strength soft drink wastewater
… by operation over 700 days. At the same time, the microbial compositions were characterized and related to reactor performance. Synthetic wastewater at a concentration of 3000 mg/L chemical oxygen demand (COD) was directly fed to two identical DHS reactors operated in parallel. The …
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Evaluation and optimisation of the performance of a multi-integrated lab-scale plant for the treatment of dairy wastewater
… significant wastewater, estimated at 2.5 times the volume of processed milk, or approximately 8.5 million tonnes annually. This wastewater poses serious environmental risks due to its high organic content, potentially leading to eutrophication and hypoxic zones in water bodies. Effective …
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An Assessment of Floating Treatment Wetlands for Reducing Nutrient Loads from Agricultural Runoff in Coastal Virginia
… that can enhance the performance of traditional retention ponds by increasing removal of the nutrients nitrogen (N) and phosphorous (P). FTWs consist of floating rafts on which wetland plants are planted, allowing the roots to be submerged below the water surface while the shoots remain above. A …
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Use of high-rate filamentous algal ponds for primary municipal wastewater treatment
… systems. Therefore, in Chapter 4 the effects of hydraulic retention time (HRT), stocking density, and harvest frequency on the growth and nutrient bioremediation performance of K. flaccidum in primary municipal wastewater in outdoor HRFAPs were examined during summer and winter. Seasonal …
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Carbon and nitrogen removal in a granular bed baffled reactor
… high chemical oxygen demand removal, biomass retention and methane yield under various operational strategies, particularly at high organic loading rates (OLRs), with synthetic glucose and brewery wastewaters. Phase separation between acidogenesis and methanogenesis mainly occurred at high …
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The effect of operational and environmental parameters on the acid-phase anaerobic digestion of primary sludge
… sludge. The operational parameters included the hydraulic retention time (HRT) and the solids retention time (SRT), while pH, reactor configuration and influent characteristics were the environmental factors of interest. Moreover, an attempt was made to identify the most significant metabolic …
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Hydrogen production via dark fermentation of carbohydrate-rich substrates
… was demonstrated for the first time that hydrogen production from grass and fodder maize by direct fermentation in batch culture (2.3 L reactor, 35°C, pH 5.2-5.3) is possible, with hydrogen yields of 75.6 ml/g dry matter wilted perennial rye grass and 62.4 ml/g dry matter of …
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International biogas applications
… platensis) was tested in laboratory trials. The hydraulic retention time (HRT) of the H2 reactor was set at 4 days. The highest hydrogen yield was obtained at an OLR of 6 kgVS/m3 /d. In the second-stage Methane reactor a HRT of 12 days was used, reaching a specific methane yield of 245 L/kgVS at …
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Mathematical Modeling and Evaluation of Ifas Wastewater Treatment Processes for Biological Nitrogen and Phosphorus Removal
… thus increasing the effective mean cell resident time (MCRT) of the biomass and providing the temperature sensitive, slow growing nitrifiers a means of staying in the system when they otherwise would washout. While the utilization of media in aerobic zones to enhance nitrification and …
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Development of a Design-Based Computational Model of Bioretention Systems
… flows and runoff volumes, shorter concentration times, and reduced infiltration. Urban runoff increases the transport of pollutants and nutrients and thus degrades water bodies adjacent to urban areas. One of the most frequently used practices to restore the hydrology and water quality of urban …
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