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Showing 1 to 20 of 52 for “"Sparging"”.
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Development of a Novel Air Sparging Device
… conditions assisted by the use of various air sparging technologies. High performance air spargers increase the probability of collision and attachment between air bubbles and particles, thereby improving recovery of fine and coarse mineral particles otherwise misplaced to the tailings fraction …
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Flow problems in air venting and air sparging
Soil Vapor Extraction (SVE) and Air Sparging have been used for site remediation for about ten years, but most of the past designs are based on experiences and numerical models. Understanding toward the physical problems is far from complete, and some simplified assumptions used in those models may …
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Modeling sparging related death in animal cell bioreactors
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1998.
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Micromechanical study of two-phase flow during air sparging
Air sparging (AS) is an in-situ soil/groundwater remediation technology, which involves the injection of pressurized air/oxygen through an air sparging well below the region of contamination. The efficiency of the in-situ sparging system is mainly controlled by the extent of contact between …
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A model for predicting air flow during in-situ air sparging
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2003.
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Investigation of Flash Flotation Technology Utilizing Centrifugal Forces and Novel Sparging Methods
… designs were developed utilizing external sparging systems and control features to float fine coal. The objective of each design was to create a system that mimics the behavior of the ASH technology, while providing advantages in bubble generation and retention time requirements. The …
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Simulation and analysis of xenon removal system through gas sparging in molten salt reactor
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-12-01
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An analysis of a diffusive-flux-limited model for groundwater cleanup rate estimation using air sparging
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1997.
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An analysis of air sparging/soil vapor extraction systems emphasizing volatilization kinetics in JP-4 jet fuel
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1996.
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A study of air flow through saturated porous media and its applications to in-situ air sparging
The efficiency of an in situ air sparging system is controlled by the extent of contact between injected air and contaminated soil and pore fluid. Characterizing the mechanisms governing air propagation through saturated porous media is therefore critical to the design of an effective cleanup …
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Stimulating In situ groudwater bioremidiation via sparging : gas flow, groundwater flow, and mass transfer in the biosparge zone
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1996.
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Optimization of Air-injection Spargers for Column Flotation Applications
… pulp. To achieve this process separation an air sparging device, which is required to produce bubbles in the flotation cell is required. In column flotation operations, Sparger sparging devices are employed in column flotation operations to generate small bubbles into the cell with the aim to …
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Application of oxygen microbubbles for in situ biodegradation of p-xylene contaminated ground water in a soil column
… drops as a function of time. Then, an air sparging section was added prior to the biodegradation section to determine if the ferrous iron could be removed in this section. The air sparging section would then be flushed with air and/or water to determine if the ferrous could be removed from …
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Two-Phase Anaerobic Digestion to Reduce the NOx Emission Potential of Biogas
… to produce H<sub>2</sub>, (2) determine the sparging rate required to achieve 15:85 H<sub>2</sub>:CH<sub>4</sub> in the biogas, and (3) operate the first and second-phases together with second-phase biogas being sparged through first-phase medium to achieve 15:85 H<sub>2</sub>:CH<sub>4</sub>. …
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Anaerobic Fermentation of Food Waste and Glycerol to Hydrogen
… 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 variables for hydrogen production from glycerol and food waste, building on previous …
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Mixing, mass transfer and energy analysis across bioreactor types in microalgal cultivation and lipid production
… energy consumption due to mixing and aeration. Sparging is commonly used for mixing and gas-liquid mass transfer in photobioreactors, but is energy intensive. The aim of this work was to reduce these energy requirements by optimising conventional sparging and considering surface aeration coupled …
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Experimental investigation of integrated systems for biohydrogen and biomethane production
… The bioH2 production is enhanced by CO2 and N2 sparging, resulting in a 40% and 35% increase, respectively, under improved conditions. The highest H2 efficiency of 92.5% is achieved using an aluminum plate while sparging CO2 gases at a rate of 400 mL/min. The peak productions of the bioH2 and …
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The effect of oxidation-reduction potential on the outgrowth, toxin production, and chemical inhibition of Clostridium botulinum type A spores
… media were poised at the different Eh levels by sparging the pre reduced media with oxygen free nitrogen or by sparging oxidized media (media autoclaved under air) with the nitrogen gas. Outgrowth, toxin production, and Eh7 changes were measured under various growth conditions. In both oxidized …
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Scale-Up the Use of a Microbubble Dispersion to Increase Oxygen Transfer in Aerobic Fermentation of Baker's Yeast
… compared for oxygen supplied by ordinary air sparging and by MBD sparging. Both air sparged and MBD systems were supplied air at equivalent volumetric flow rates. The volumetric oxygen transfer coefficients (KLa) were estimated by the yield coefficient method. The KLa values increased from …
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Synthesis, Characterization and Evaluation of Sonochemically Generated Materials
… concentration, stabilizer amount, frequency, and sparging gas has no noticeable effect on the size distribution of Fe colloids, which remain in the 3--12 nm range. We have concluded that the size distribution does not change significantly because small Fe particles (∼0.4 nm with MP ≈ 350 K) …
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