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Showing 1 to 20 of 70 for “"oxygen transfer"”.
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Oxygen transfer in recirculating flow
An experimental investigation was done on oxygen transfer into a laminar flow of whole blood and saline solutions downstream of an abrupt pipe expansion. This was used as the experimental model for regions of separated flow in the arterial system. The flow was fully-developed prior to the expansion …
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Predicting Oxygen Transfer in Hypolimnetic Oxygenation Devices
… predict the performance of several hypolimnetic oxygenators. The model is used to predict the oxygen transfer rate in a hypolimnetic oxygenator based on the initial bubble size formed at the diffuser. The discrete-bubble model is based on fundamental principles, and therefore could also be …
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Hypolimnetic Aerators: Predicting Oxygen Transfer and Water Flow Rate
… of hypolimnetic aerators with respect to oxygen transfer and water flow rate to allow the development of two comprehensive process models. The oxygen transfer model is the first model that applies discrete-bubble principles to a hypolimnetic aerator, and the water flow rate model is the …
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Biological Aerated Filters: Oxygen Transfer and Possible Biological Enhancement
… filter (BAF) has been studied to 1) evaluate oxygen transfer kinetics under conditions without biological growth and 2) determine the influence of biological growth on the rate of oxygen transfer. Collectively, the study evaluates the rates of supply and consumption of oxygen in BAFs. The …
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Oxygen transfer studies in the completely mixed activated sludge process
… regarding the rates and mechanisms involved in oxygen transfer to wastewater systems also exist. This research investigation examined the effects of the mean cell residence time and wastewater stoichiometry on the operation of the completely mixed activated sludge process under a dual substrate …
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Oxygen transfer in aerated systems containing one and two liquid phases
Digitized by Kansas Correctional Industries
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Oxygen transfer in aerated systems containing one and two liquid phases
Digitized by Kansas Correctional Industries
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Partial nitrification and oxygen transfer analysis utilizing hollow fiber membrane aeration
… this partial nitrification system.y Gas mass transfer was first evaluated to determine the K<sub>L</sub>a oxygen transfer coefficient. Reactor parameters, such as mixing speed, membrane length, and gas pressure, were evaluated to determine how K<sub>L</sub>a was affected by these variables.y …
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Increased oxygen transfer in a yeast fermentation using a microbubble dispersion
The use of a microbubble dispersion (MBD) for oxygen transport in a yeast fermentation was studied. No surfactants were added to the fermentations; the microbubbles were formed using only the surfactants naturally produced by the yeast. The growth rate of a Saccharomyces cerevisiae culture was …
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The Endocyclic Restriction Test: Mechanistic Investigations of Sulfur and Oxygen Transfer Reactions
Mechanistic elucidation of an oxygen transfer reaction was sought by the application of the endocyclic restriction test toward an aldehyde-mediated epoxidation of olefins by molecular oxygen. The differentiation between alternate oxygen transfer reagents is provided by stereochemical studies, and …
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Physical and biological factors affecting oxygen transfer in the activated sludge wastewater treatment process
… on determining different factors that influence oxygen transfer and consequently its energy demand.</p><p>AS morphology, as described by the d<sub>10</sub>, d<sub>20</sub>, d<sub>32</sub>, specific filament length (SFL), 30 min settleability (SV<sub>30</sub>), etc., does influence the OTE. …
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Evaluating new Oxygen Transfer Materials for Air Separation, Oxy-Fuel Combustion and other Processes
… the pre-dominant commercial process to produce oxygen until it was superseded by the Hampson-Linde cycle in the early $20^{th}$ century. A chemical air separation loop is characterised by the cyclic reduction and oxidation of solid material serving as an oxygen carrier, which has the capacity to …
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Utilization of a Microbubble Dispersion to Increase Oxygen Transfer in Pilot-Scale Baker's Yeast Fermentation Unit
… <i>Saccharomyces cerevisiae</i> (baker's yeast), oxygen transfer, which is one of the major limiting factors, is improved by using high agitation rates. However, high agitation rates subject the microorganisms to high shear stress and caused high power consumption. A microbubble dispersion (MBD) …
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Scale-Up the Use of a Microbubble Dispersion to Increase Oxygen Transfer in Aerobic Fermentation of Baker's Yeast
A microbubble dispersion (MBD) was used to supply oxygen for an aerobic fermentation of Baker's yeast. The 1-liter microbubble dispersion generator supplied bubbles for 20-liter and 50-liter working volume fermentations in a 72-liter pilot scale fermenter. The microbubbles were stabilized by the …
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An experimental evaluation of the geometry of transition structures for oxygen transfer reactions: Use of the endocyclic restriction test
Oxygen transfer reactions giving rise to epoxides from olefins have been the topic of numerous studies with both synthetic and mechanistic emphases. In spite of considerable effort, the issue of the transition structure geometry has been a fundamental unanswered question. Our research has focused …
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Investigation of the Effects of Sequential Anaerobic, Anoxic and Aerobic Zones on Dissolved Oxygen Transfer Parameters in a biological Nutrient Removal Pilot Plant
… and pilot scale determinations of the volumetric oxygen transfer coefficient, K<sub>L</sub>a, were performed on an improved A²/O biological nutrient removal (BNR) pilot plant. Effluent from a full scale primary clarifier, used as pilot plant influent, was found to have an alpha (ratio of process …
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1. The Endocyclic Restriction Test: Oxygen Transfer From N-Sulfonyl Oxaziridines to Alkenes and Fluorine From N-Fluorosultams to Carbanions. 2. Intra- and Intermolecular Kinetic Isotope Effects in Directed Lithiations
The transition state geometry for the transfer of oxygen from N-sulfonyl oxaziridines to alkenes and fluorine transfer from N-fluoro sultams to carbanions was investigated. In the former application of the endocyclic restriction test, a transition state model was developed, however, a model has not …
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Compatibility and toxicity of polymer-coated magnetic nanoparticles on mammalian cell systems
… Both particles were found to increase the oxygen transfer in an aqueous solution. A 1.5% solution of particle A enhanced the oxygen transfer 41.8% over the control, water, while 1.4% particle B enhanced 15.9% over the control. While particle A has a better effect on oxygen transfer, this …
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Application of oxygen microbubbles for groundwater oxygenation to enhance biodegradation of hydrocarbons in soil systems
… in anaerobic groundwater would be enhanced by oxygenating the water. This was done by injecting oxygen microbubbles in the soil matrix packed in a 7 ft by 7 ft by 5 inches in width Vertical Slice Test Cell, VSTC, and in a 30-inch column, also packed with sand. Transfer of oxygen to water was …
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Exploration of the Linkage between the A:a gradient and oxygen transfer efficiency as a measure of response to treatment with inhaled nitric oxide in a heterogenous group of newborns treated for acute hypoxic respiratory failure
… intrapulmonary and extra pulmonary shunting and oxygen transfer efficiency in the newborn treated for AHRF using inhaled nitric oxide. The aims of this study were to identify linkages between shunting and oxygenation prior to and during inhaled nitric oxide (iNO) therapy and to determine whether …
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