||Air Sparging Experiments on a Two Dimensional Sand Box with DNAPLS: Multiphase Investigation with Electrical Impedance Tomography.
Cho, J. S. ;
||National Risk Management Research Lab., Ada, OK. Subsurface Protection and Remediation Div.
Multiphase flow ;
Environmental transport ;
Water pollution detection ;
Subsurface flow ;
Two dimensional flow ;
Soil structure ;
Electrical conductance ;
Electrical impedence tomography ;
DNAPL(Dense Nonaqueous Phase Liquids) ;
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Electrical impedance tomography (EIT) applications in detection of organic chemical sources and monitoring subsurface environments during air-sparging were studied. A multiphase flow and transport model was utilized to test the EIT inverse modeling. Tetrachloroethylene (PCE) infiltration was simulated with a multiphase flow model and the ability of EIT to trace the PCE distribution was tested. Computational progress of the inverse solution was presented with a graphical display of electrical conductivity distributions. The inverse program for EIT was used to obtain the electrical conductivity distribution in a 2-D sand box. The experiments included a spillage of dense non-aqueous phase liquid (DNAPL) dyed with a hydrophobic dye at the top of the sand box filled with water and air sparging from the bottom. Electrical conductivity changed in the soil as water was replaced with DNAPL or air.