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 Residence Time"”.
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Spatial and temporal patterns exhibited by select physicochemical and biological water quality parameters in Lake Texoma, Oklahoma and Texas.
… influenced by inter-annual variability in hydraulic residence time. Hypolimnetic oxygen depletion rates were also observed to be affected by changes in hydraulic residence time with a long-term trend of decreasing relative areal hypolimnetic oxygen rates detected between the 1970s and …
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Hydrothermal Process of Swine Manure to Oil Using a Continuous Reactor System
… developed. The effects of temperature, pressure, hydraulic residence time, and use of process gas, were evaluated to determine the optimal process condition. Products' (i.e., oil, aqueous and gas) composition were determined to better understand the mechanics of the reaction process and to provide …
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Kinetics, mass transfer, and mass re-equilibrium for arsenate adsorption on iron oxide-based carbons
… however, is rather ineffective due to the short hydraulic residence time in small water treatment systems. … The Freundlich isotherm can fit experimental data well: a crossover point for the two fitted Freundlich isotherms was observed and nano-FeAC had higher adsorption plateau. Furthermore, we …
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Stoichiometry and kinetic modeling of an anaerobic baffled reactor, The
… design allows for a decoupling of the solids and hydraulic residence time, meaning that solids are retained under varying hydraulic loading conditions. The ABR configuration fosters a naturally occurring spatial distribution of microorganisms that perform the sequential steps of hydrolysis, …
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Water quality and sedimentation implications of installing a hydroelectric dam on the Río Baker in Chilean Patagonia
… to that of the original riverine system. Short hydraulic residence time and low nutrient loading facilitate this result. Conversely, sediment computations indicate that sedimentation and erosion issues are likely for the future dam-and-reservoir system.
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Water Quality Variations During Nitrification In Drinking Water Distribution Systems
… (PDSs). The PDSs were operated at a 5-day hydraulic residence time (HRT) and ambient temperatures. As seasonal temperatures increased the rate of monochloramine dissipation increased until effluent PDS residuals were zero. PDSs effluent water quality parameters chloramines residual, …
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Spatial and Temporal Transitions in the Composition and Transport of Carbon under Variable Flow
… disrupt river flow patterns, as they increase hydraulic residence time and alter the flow of DOM downstream. During storms when the majority of DOM loading occurs, impoundments become less likely to hold DOM and will increase export of DOM downstream. In this study, we quantified DOM …
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Biodegradation of 2,4-Dinitrotoluene in the Waste Streams of a Munitions Plant
… daily with phosphate-amended wastewater, at a hydraulic residence time of 3 days. DNT removal resumed without a lag even after it was absent from the feed for periods up to 15 days. During aerobic biodegradation of DNT, reduction to 4-amino-2-nitrotoluene and 2-amino-4-nitrotoluene was …
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Improving performance and expanding application of denitrifying bioreactors for nutrient management in agricultural landscapes
… 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 generally unreliable predictors of NRE in both media types. The second study (Chapter …
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The performance of a field scale biofiltration cells in reducing nutrient rich surface runoff from an informal settlement in South Africa
… and reduction of concentrations under different Hydraulic Residence Time (HRT) and flow rates. Linear regression was used to measure the effectiveness of each substrate in the biofilter cells and to evaluate the change in cell performance over time against the influent feedstock. A one-way ANOVA …
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Long-Term Lab Scale Studies of Simulated Reclaimed Water Distribution: Effects of Disinfectants, Biofiltration, Temperature and Rig Design
… the volume of the first pipe segment (1 day of hydraulic residence time), compared to 0.32-0.45% volume in the corresponding chlorinated SRWDSs. The mass of accumulated sediment positively correlated (R2 = 0.82) with influent turbidity. Contrary to experiences with potable water systems, …
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A novel semi-passive process for sulphate removal and elemental sulphur recovery centred on a hybrid linear flow channel reactor
… Despite the lack of active mixing, at a 4-day hydraulic residence time, the system achieved volumetric sulphate reduction rates similar to that previously shown in a continuous stirred-tank reactor. The outcome of the demonstration at laboratory scale generated interest to evaluate the …
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Physicochemical and biological treatability study of textile dye wastewater
… treatment and that at least a five day hydraulic residence time (HRT) was needed for maximum color and organic removals. Two day HRT, continuous-flow reactors receiving combined wastewater were very unstable and failed to biologically treat the waste. Increasing the residence time to …
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Water and Nutrient Recycling in High Rate Algae Ponds Fed in Primary Treated Municipal Wastewater
… ponds, with two pond sets run on 3-day hydraulic residence time (HRT), and the third on a 2-day HRT. The biomass productivity of the 2-day HRT and 3-day HRT were compared. The two sets of 3-day HRT ponds were run in series to determine the effect on productivity associated with recycling …
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Anaerobic Co-digestion of Wastewater Treatment Pond Algae with Wastewater Sludge
… rate (OLR; 2 or 4 g volatile solids/L-d), and hydraulic residence time (HRT; 20 or 40 d), while the main dependent variables were methane yield, volumetric methane production, and the dewaterability of the digester effluents. Co-digestion of algae with sludge was stable, with healthy pH, at all …
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Integrated Aeration for Enhanced Nitrogen Conversion and Removal and the Effect of Sampling Frequency on Productivity Estimates in Algae-Based Wastewater Treatment Systems
… but one that is hindered by the low nighttime dissolved oxygen concentrations (DO) common in wastewater treatment raceways. The large diel difference in pond conditions and changing influent wastewater quality also raises the question of the optimal frequency and timing of grab sample …
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Disinfection of wastewater for reuse using microchannel plasma ozone generator
… and controlled by the disinfection contact time, initial ozone concentration and initial WOM loading. An integrated life cycle assessment (LCA) and quantitative microbial risk assessment (QMRA) was used to compare microplasma ozonation versus chlorination to disinfect wastewater for …
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Nitrification Investigation And Modeling In The Chloraminated Drinking Water Distribution System
… temperature, chloramine residuals and hydraulic residence times (HRT) during biological nitrification are interrelated and discussed relative to nitrification, which demonstrated Stoichiometric relationships associated with conventional biochemical nitrification reactions. Ammonia is …
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Effects of Raceway Pond Water and Nutrient Recycling on Microalgae Production and Harvesting
… surface area each, 0.3-m deep, 4-day hydraulic residence time with CO<sub>2</sub> supplementation). One control set was fed primary clarifier effluent while the other control set was fed nitrified, filtered reclaimed wastewater. The two experimental raceway sets were fed different …
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Anaerobic Fermentation of Food Waste and Glycerol to Hydrogen
… are affected by pH, organic loading rate (OLR), hydraulic residence time (HRT), and substrate type. A less studied process to increase yield is sparging with low-H<sub>2</sub> content gas to strip H<sub>2</sub> from the digester liquid. The present study optimized the levels of each of these …
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