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 62 for “"hydraulic retention time"”.
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Impact of Biochar Amendment, Hydraulic Retention Time, and Influent Concentration on N and P Removal in Horizontal Flow-Through Bioreactors
… and 1.9 and 0.6 mg L-1 PO43--P was delivered at hydraulic retention times (HRTs) of 3, 6, and 12 h. Mean NO3--N removal efficiencies ranged from 16.9%-93.7%, and media type was insignificant at low influent NO3--N concentrations, but B30 was the most effective at high influent NO3--N …
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Effects of hydraulic loading and laundry detergent on the operation of aerobic package treatment systems
… operation of aerobic package treatment systems: hydraulic retention time, laundry detergents, and hydraulic surges. To determine the effect of hydraulic retention time on system performance, six bench scale activated sludge systems were constructed. Wastewater from an actual residence was …
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Using Tall Fescue to Remove Nutrients from Renovated Turkey Processing Wastewater
… The plate/fabric/ grass cells with different hydraulic retention time were studied. The results show that there is no significant difference in treatment between 3, 4 and 5-days hydraulic retention time. With 1-day of retention time nutrient removal fluctuated. Two days of retention achieved …
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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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APPLIED MICROBIAL ECOLOGY OF ANAEROBIC REACTOR MICROBIOMES
… chapter tested the effects of shortening the hydraulic retention time on the community assembly and functioning in the model ecosystems, aiming to quantitatively predict ecophysiological functions of the microbial communities. For the process performance, higher productivities and yields of …
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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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A technological model for low energy domestic wastewater treatment
… energy efficient design of the ABR in terms of hydraulic retention time and operational temperature, the performance efficiencies of ABR bench models were monitored at ambient temperature and 37<sup>o</sup>C at hydraulic retention times (HRT) of 48, 36, 24, 12 and 6 hours, which corresponded to …
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Phosphorrückgewinnung bei der Abwasserreinigung : Entwicklung eines Verfahrens zur Integration in kommunale Kläranlagen
… This thickener is operated with a longer hydraulic retention time and the sludge is mixed periodically by recirculation. Due to a longer retention time and the anaerobic conditions in the thickener, the release of phosphorus, which has been bound biologically, is higher than in …
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Dissolution and Biokinetics of PCL in Denitrification Systems
… effects of temperature, bead mass, solvent type, hydraulic retention time, and bead reuse on PCL dissolution and soluble chemical oxygen demand (SCOD) release. The dissolution behavior was represented using a modified Noyes-Whitney model, which was calibrated to capture the kinetics and predict …
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A laboratory study on the anaerobic digestion of yeast waste
… operated at a wide range of loadings. A constant hydraulic retention time was maintained for each of the digesters and sufficient sludge withdrawn daily to maintain a constant sludge concentration over the range of loadings used. The ability of each of the parameters used to monitor digestion, to …
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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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Sustainable electro-bioremediation of multi-contaminated groundwater
… a two-chamber BES, focusing on the influence of hydraulic retention time on denitrification performance. Advanced cathode materials were further evaluated using carbon nanotube (CNT)-based membranes for denitrification. Subsequently, a three-chamber BES was developed to achieve simultaneous …
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Modeling of Biological Activity in Expanded-Bed, Anaerobic Activated Carbon Filters
… models predicted biomass very well for a shorter hydraulic retention time. Very high organic removal efficiencies, long mean cell residence times, as well as very low concentrations of effluent suspended solids were characteristic features noted from the anaerobic activated carbon filters.
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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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Viability of substitution of electricity with biogas for thermal uses at Neudamm campus of the University of Namibia
… parameters included an estimated 30-day hydraulic retention time, with pressure monitored three times daily in the first week, twice daily from Days 8–21, and once daily thereafter.. The digester achieved an average daily biogas yield of 0.95 L, equivalent to 7.61 MJ (2.11 kWh). Based on …
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Process simulation and experimental investigation of biofuel production in a high rate anaerobic digestion process
… that used to treat the wastes and at the same time generate energy out of it. The anaerobic digestion process generates a mixture of methane and carbon dioxide gases which is known as biogas.</p> <p>The biogas composition is about 50-70% methane and 10-30% of carbon dioxide and trace amount of …
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Effects Of Reduced Ras And Volume On Anaerobic Zone Performance For A Septic Wastewater Biological Phosphorous Removal System
… than typical anaerobic zone volume (1.08 hours hydraulic retention time or HRT). Three identical parallel biological nutrient removal (BNR) pilot plants were fed with strong, highly fermented (160 mg/L VFAs), domestic/industrial wastewater from a full scale wastewater treatment facility (WWTF). …
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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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