Title:
Unsteady Multiphase Flow Modeling of In-situ Air Sparging System in a Variably Saturated Subsurface Environment

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dc.contributor.advisor Aral, Mustafa M.
dc.contributor.author Jang, Wonyong en_US
dc.contributor.committeeMember Ching-Hua Huang
dc.contributor.committeeMember Sotira Yiacoumi
dc.contributor.committeeMember Spyros Pavlostathis
dc.contributor.committeeMember Turgay Uzer
dc.contributor.department Civil and Environmental Engineering en_US
dc.date.accessioned 2006-01-18T22:18:43Z
dc.date.available 2006-01-18T22:18:43Z
dc.date.issued 2005-11-18 en_US
dc.description.abstract In order to preserve groundwater resources from contamination by volatile organic compounds and to clean up sites contaminated with the compounds, we should understand fate and transport of contaminants in the subsurface systems and physicochemical processes involving remediation technologies. To enhance our understanding, numerical studies were performed on the following topics: (i) multiphase flow and contaminant transport in subsurface environments; (ii) biological transformations of contaminants; (iii) in-situ air sparging (IAS); and, thermal-enhanced venting (TEV). Among VOCs, trichloroethylene (TCE) is one of the most-frequently-detected chemicals in the contaminated groundwater. TCE and its daughter products (cis-1,2-dichloroethylene (cDCE) and vinyl chloride (VC)) are chosen as target contaminants. Density-driven advection of gas phase is generated by the increase in gas density due to vaporization of high-molecular weight contaminants such as TCE in the unsaturated zone. The effect of the density-driven advection on fate and transport of TCE was investigated under several environmental conditions involving infiltration and permeability. Biological transformations of contaminants can generate byproducts, which may become new toxic contaminants in subsurface systems. Sequential biotransformations of TCE, cDCE, and VC are considered herein. Under different reaction rates for two bioreaction kinetics, temporal and spatial concentration profiles of the contaminants were examined to evaluate the effect of biotransformations on multispecies transport. IAS injects clean air into the subsurface below the groundwater table to remediate contaminated groundwater. The movement of gas and the groundwater as a multiphase flow in the saturated zone and the removal of TCE by IAS application were analyzed. Each fluid flow under IAS was examined in terms of saturation levels and fluid velocity profiles in a three-dimensional domain. Several scenarios for IAS systems were simulated to evaluate remedial performance of the systems. TEV was simulated to investigate its efficiency on the removal of a nonaqueous phase liquid in the unsaturated zone under different operational conditions. For numerical studies herein, the governing equations for multiphase flow, multispecies transport, and heat energy in porous media were developed and solved using Galerkin finite element method. A three-dimensional numerical model, called TechFlowMP model, has been developed. en_US
dc.description.degree Ph.D. en_US
dc.format.extent 4106542 bytes
dc.format.mimetype application/pdf
dc.identifier.uri http://hdl.handle.net/1853/7517
dc.language.iso en_US
dc.publisher Georgia Institute of Technology en_US
dc.subject Air sparging en_US
dc.subject Soil contamination
dc.subject Groundwater contamination
dc.subject Multiphase flow
dc.subject Volatile organic carbon
dc.subject TechFlowMP
dc.subject.lcsh Subsurface drainage en_US
dc.subject.lcsh Water Pollution Mathematical models en_US
dc.subject.lcsh Groundwater Air sparging en_US
dc.subject.lcsh Multiphase flow Data processing en_US
dc.subject.lcsh Pollutants Transport properties en_US
dc.title Unsteady Multiphase Flow Modeling of In-situ Air Sparging System in a Variably Saturated Subsurface Environment en_US
dc.type Text
dc.type.genre Dissertation
dspace.entity.type Publication
local.contributor.corporatename School of Civil and Environmental Engineering
local.contributor.corporatename College of Engineering
relation.isOrgUnitOfPublication 88639fad-d3ae-4867-9e7a-7c9e6d2ecc7c
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
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