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Showing 1 to 16 of 16 for “"Air 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 …
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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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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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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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Application of oxygen microbubbles for in situ biodegradation of p-xylene contaminated ground water in a soil column
… pressure 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 …
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Optimization of Air-injection Spargers for Column Flotation Applications
… in a 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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Scale-Up the Use of a Microbubble Dispersion to Increase Oxygen Transfer in Aerobic Fermentation of Baker's Yeast
… were 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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Characterisation of fouling behaviour with direct observation technique for membrane bioreactor applications
… velocity at a given area during crossflow sparging was higher than the result obtained during CF without aeration due to flow wake caused by bubble flow and lateral membrane movement. These two phenomena, which were observed during crossflow plus air sparging, promoted the fouling thickness …
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A Study of Rhamnolipid Microbubble Dispersion for Bioremediation Applications
… situ bioremediation owing to its advantages over air sparging, bioventing and surfactant injection. Characterisation studies investigated the stability, size distribution and gas hold-up properties of the rhamnolipid microbubble dispersion. Drainage experiments and contact angle measurements were …
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Effective properties of multiphase flow in heterogeneous porous media
… a dense nonaqueous phase liquid (DNAPL) plume or air sparging contributing area is derived to evaluate the sensitivity of system behavior to properties of input processes. Anisotropy is predicted for uniform, vertical flow in the Borden Aquifer consistent with both prior experimental observations …
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The development of methods and equipment for the study of the aerating capabilities of a microdispersion of air in water
… was compared to the current technique of sparged air injection. The methods and equipment for conducting experimentation on the aeration of an unconfined aquifer, as a vertical slice of soil, have been developed. A specific number of parameters including dissolved oxygen concentration, hydraulic …
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The development and evaluation of engineering strategies to enhance microbial oil production for industrial applications
… in both oleaginous thraustochytrids and yeasts. Air sparging of the experimental cultures was found to significantly reduce the cultivation times of all strains and, in some cases, enhane biomass and lipid production. Aeration was also found to reduce the effects of FA variation with cultivation …
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Adsorption of Single and Multi-Component Per-and Polyfluoroalkyl Substances (PFAS) at Air-Water Interfaces
… with a particular focus on their adsorption to air-water interfaces under environmentally relevant conditions. Laboratory experiments were conducted in one-dimensional columns and in a two-dimensional cell to assess the air-water interfacial adsorption of individual PFAS species and PFAS …