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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 22 for “"oxygen utilization"”.
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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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Mechanisms of contact stabilization substrate removal
… monitored for unusual responses in substrate and oxygen utilization. Other factors determined included yield and oxygen utilization constants, substrate removal rates, and initial removal capacities of the sludge. Physical studies on the metabolically inactive sludge yielded data on the facility …
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The effect of inert biomass support media on activated sludge treatment of a high-strength industrial wastewater
… The effect of the media on substrate and oxygen utilization, and solid-liquid separation was investigated. Substantial attached growth did not occur on the NORPAC and BIONET media. The attached biomass concentration in the Linpor systems increased with increased media concentration. The …
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An investigation of substrate removal and storage in the activated sludge process
… removal, microbial substrate storage, and oxygen utilization at a constant food-to-microorganism ratio. Batch experiments were conducted, under aerated and completely mixed conditions, using a domestic wastewater, a paper mill wastewater, and a food processing wastewater. A series of three …
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A determination of air-sea gas exchange and upper ocean biological production from five noble gases and tritiugenic helium-3
… of helium isotopes, tritium, argon, and oxygen was used to constrain upper ocean biological production. Specifically, the helium flux gauge technique was used to estimate new production, apparent oxygen utilization rates were used to quantify export production, and euphotic zone seasonal …
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The effect of high temperatures (30 degrees Celsius) on biological nutrient removal performance
… sampled and tested ,almost daily for Chemical Oxygen Demand (COD), Total Kjeldahl Nitrogen (TKN), Free and Saline Ammonia (FSA), nitrate, nitrite, Total Phosphorus, Volatile Settleable Solids (VSS), Total Settleable Solids (TSS), pH, Oxygen Utilization Rate (OUR) and diluted sludge volume index …
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A determination of air-sea gas exchange and upper ocean biological production from five noble gasses and tritiugenic helium-3
… of helium isotopes, tritium, argon, and oxygen was used to constrain upper ocean biological production. Specifically, the helium flux gauge technique was used to estimate new production, apparent oxygen utilization rates were used to quantify export production, and euphotic zone seasonal …
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The stoichiometry and kinetics of biological heat generation in the aerobic stage of dual digestion
… of the autothermal thermophilic aerobic reactor oxygenated with pure oxygen. As a consequence of the encouraging results obtained in this study (Trim and McGlashan, 1984; Trim, 1984), in 1987 the WRC and Milnerton Municipality supported a frill scale evaluation of dual digestion ( 45 ma pure …
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Gravity selector-enabled kenaf recirculation and reuse as a renewable ballasting agent for sludge settleability enhancement in a municipal wastewater secondary process: A real wastewater pilot-scale study
… and resulted in active sludge inventory loss. An oxygen utilization rate-based method was developed and verified for easy SRT correction to avoid kenaf interference with the sludge wasting protocol. Denser kenaf incorporated into the sludge matrix during flocculant settling contributed to the …
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A comparison of sludge properties and kinetic differences between a pure oxygen system and a conventional system
… objective of this research was to analyze a pure oxygen activated sludge process and its claimed advantages. The major emphasis of both the claims and this research was the settleability of the sludge and the biological kinetics. An identical conventional air activated sludge unit was also …
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A study of North Atlantic ventilation using transient tracers
… conditions on thermocline ventilation and oxygen utilization rate estimates are discussed. Tracers that equilibrate rapidly with the atmosphere, such as 3He and the CFCs, have lower apparent ventilation time scales than t racers, such as tritium and radiocarbon, t hat are reset slowly in …
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Transformations of mercury in the marine water column
… the Pacific Ocean. Over significant gradients in oxygen utilization and primary productivity, we observed a region of methylated Hg species focused in the Equatorial Pacific that appeared spatially separated from higher concentrations in North Pacific Intermediate Waters. From the first full water …
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Effects of Hyperoxia on Thermal Tolerance and Indicators of Hypoxic Stress in Antarctic Fishes That Differ in Expression of Oxygen-Binding Proteins
… Channichthyidae) are unique in lacking the oxygen carrier hemoglobin (Hb) in their blood, leaving them with only 10% of the oxygen-carrying capacity observed in closely related red-blooded fishes. Previous studies have shown that icefishes have lower critical thermal maxima …
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Transformations of mercury in the marine water column
… the Pacific Ocean. Over significant gradients in oxygen utilization and primary productivity, we observed a region of methylated Hg species focused in the Equatorial Pacific that appeared spatially separated from higher concentrations in North Pacific Intermediate Waters. From the first full water …
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Renal Blood Oxygen Level Dependent (BOLD) Magnetic Resonance Imaging with an Acute Furosemide Stimulus as a Tool to Evaluate Kidney Physiology in Patients Suspected of Renal Artery Stenosis
… magnetic resonance imaging techniques. Blood Oxygen Level Dependent (BOLD) magnetic resonance imaging has recently been utilized as a noninvasive tool to detect kidney oxygenation in a number of renal pathologic states. Specifically, it has been evaluated as a potential prognostic tool to …
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Verification of the bisubstrate concept in modelling of the activated sludge process
… These characteristics were inferred from the oxygen utilization rate response of a system fed in a cyclic square wave fashion. No work has been done to verify if substrates of specific chemical structures can be allocated to one or the other of the fractions. One of the objectives of this …
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The development of process kinetics for a waste treatment system utilizing filamentous microorganisms
… solids, COD, BOD, sludge production, and oxygen utilization were used to determine the effects of parameters like flow rate, support media area, organic loading, pH, and the BOD-to-nitrogen ratio. Findings of the study indicated that the removal rate, suspended solids concentration in the …
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Model analysis of oxygen transport and metabolism in skeletal muscle: responses to a change in energy demand
<p>The increase in skeletal muscle oxygen consumption (VO<sub>2</sub>) at the onset of contraction is an indicator of the ability to do work. The VO<sub>2</sub> response to contraction (i.e., VO<sub>2</sub> kinetics) is determined by oxygen delivery (convective and diffusive) to tissue, oxygen …
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Mass, heat and nutrient fluxes in the Atlantic Ocean determined by inverse methods
… heat flux of 1.3±.2x1015 Wand an equatorward oxygen flux of 2900±180 kmol S-l across each latitude. The net flux of silicate is also equatorward: 138±38 kmol s-1 and 152±56 kmol s -1 across 36°and 24° N, respectively. However, in contrast to heat and oxygen, the overturning cell is not the …
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Mass, heat and nutrient fluxes in the Atlantic Ocean determined by inverse methods
… heat flux of 1.3±.2z10'5 W and an equatorward oxygen flux of 2900±180 kmol s-' across each latitude. The net flux of silicate is also equatorward: 138±38 kmol s-1 and 152±56 kmol s-1 across 36 0and 24*N, respectively. However, in contrast to heat and oxygen, the overturning cell is not the only …
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