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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 29 for “"oxygen uptake rate"”.
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Evaluation of oxygen uptake rate as an activated sludge process control parameter
… currently exists concerning whether or not oxygen uptake rate is a valid control parameter for monitoring the activated sludge process. A laboratory study was conducted to attempt to shed light on the controversy. Two bench-scale reactors were operated at steady state and under shock load. …
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Open, stirred-jar technique for estimation of microbial deoxygenation in the prediction of dissolved oxygen profiles in streams
… stirred-jar technique as a method to estimate oxygen-uptake due to degradation of organic waste and nitrification by suspended microbes was studied. With this procedure, both the concentration of waste and the reaeration rate can be set to values similar to those expected in the stream. Thus, …
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Effects of holding tank odor control chemicals on aerobic wastewater treatment
… for changes in suspended solids, specific oxygen uptake rate, sludge settling and compaction, and effluent COD. The biodegradability of dyes and the generation of foam was also measured. Formaldehyde and the formaldehyde-based odor control chemical "Aqua-Kem" damaged the ability of …
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A comparison of oxygen utilization determination techniques for the activated sludge process
… 1. Currently used methods of quantifying oxygen uptake rate, especially for batch reactors, yield values of oxygen utilization considerably lower than those predicted by mass balance considerations for these three wastes. In the face of Blok's published data indicating much better results …
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An investigation of the effects of the addition of powdered activated carbon to the activated sludge of cellulose acetate manufacturing wastewater
… wastewater were found to enhance substrate removal. The improved substrate removal as measured by COD averaged 20 percent. The apparent mechanism of improved removal was the stimulation of greater biomass growth. PAC addition increased the oxygen uptake rate (OUR), the observed cell …
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Coagulation study of a bound water bulked sludge
… microbial metabolism was studied using dissolved oxygen uptake. Coagulant dosages ranging from 200 mg/l to 700 mg/l were added to 1000 mg/1 and 2000 mg/l mixed liquor volatile suspended solids (MLVSS) concentration sludges, while dosages ranging from 200 mg/l to 1100 mg/l were added to 3000 mg/l …
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Oxygen transfer studies in the completely mixed activated sludge process
… Recent studies have indicated that dual substrate limitations may occur in the process. Several misconceptions in the basic fundamentals regarding the rates and mechanisms involved in oxygen transfer to wastewater systems also exist. This research investigation examined the effects of the mean …
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Metabolic Changes in Astrocytes Following Traumatic Brain Injury
… coefficients and ionic charges were incorporated to ensure stoichiometric balance across the model. Physiologically relevant constraints from experimentally derived astrocyte metabolite uptake rates bounded upper and lower limits of astrocyte metabolism. Hypoxia and acidosis were simulated …
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Meeting the oxygen requirements of an isolated perfused rat liver
… and optimize the state of perfused livers. Oxygen uptake rate, the primary indicator of organ metabolism and therefore a likely important marker of organ viability, was chosen as one such parameter to be investigated. A systematic review and reproduction of numerous oxygenation conditions …
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Microbial respiration on decaying leaves and sticks along an elevational gradient of a southern Appalachian stream
… respiration on sticks and leaves, measured as oxygen uptake rate, was compared among four (2nd-4th order) sites along an elevational gradient at Coweeta Hydrologic Laboratory, North Carolina. Rhododendron and birch leaves were placed in mesh bags in the stream at each site on 21 Oct 90. Oxygen …
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Investigation of Secondary Phases Including Ionic Liquids for Biphasic Bioreactors Treating Hydrophobic VOCs
… was determined. Additionally the effect on the oxygen uptake rate (OUR) and cell growth in a flask of each 2° phase on biological cultures enriched on toluene and hexane was studied. It was determined that OUR is a poor method of screening 2° phases for biophasic bioreactors. Additionally, cell …
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An Assessment of the Contribution of Terrestrial Organic Matter to Total Organic Matter in Sediments in Scottish Sea Lochs
… biomarker for terrestrial organic matter. The oxygen uptake rate, percentage organic matter due to loss on ignition, Rp index, total carbon, total organic carbon (TOC), total nitrogen, C/N<br/>ratio, and phosphate content were used as the proxies to determine the biodegradability of the …
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Moderately-rapid assessment of alkaline desiccation environmental systems
A moderately-rapid assessment tool was developed to analyze the waterless desiccation compost toilet investigated in a rural Mexican setting. Over 100 social factors were identified along with the applicable technical factors that influenced the low acceptability of the toilets. A 4-point rating …
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Responses of Nitrifying Bacteria to Aquaculture Chemotherapeutic Agents
… bacteria at the whole cell level as demonstrated in the results from water quality and specific oxygen uptake rate analyses. The nitrification process resumed once the chemotherapeutant was removed from the system, either by a mandatory water change or by natural degradation. The other three …
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The application of estimation and control techniques in 2 modes of exercise for the spinal cord injured
… spinal cord injury. Preliminary data has demonstrated the feasibility of FES cycling in the paediatric SCI population. The use of an electric motor to provide torque assistance where required allows the exercise to continue for longer periods and over a wider range of cadences. In this thesis, a …
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Measuring faecal sluge stabilization and its relation to dewatering performance.
… Solids to Total Solids ratio and the Specific Oxygen Uptake Rate and is associated with dewatering performance measured as capillary sanction time. Stabilization was correlated to the age/ type of faecal sludge, though the differences based on sludge age were not significant among samples from …
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Measuring faecal sluge stabilization and its relation to dewatering performance.
… Solids to Total Solids ratio and the Specific Oxygen Uptake Rate and is associated with dewatering performance measured as capillary sanction time. Stabilization was correlated to the age/ type of faecal sludge, though the differences based on sludge age were not significant among samples from …
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Investigation of the Effects of COD/TP Ratio on the Performance of a Biological Nutrient Removal System
… investigate the effects of COD/TP ratio on the rates of phosphorus removal, COD removal, nitrogen removal, PHB utilization and oxygen uptake. The system was fed with municipal wastewater and operated at 20° C. The influent COD concentration was held approximately constant while the phosphorus …
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