Air Sparging Experiments on a Two Dimensional Sand Box with DNAPLS: MultiphaseInvestigation with Electrical Impedance Tomography

摘要

Electrical impedance tomography (EIT) applications in detection of organicchemical 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.