DNAPL Source Zone Depletion During In Situ Chemical Oxidation (ISCO): Experimental and Modeling Studies

摘要: Abstract : In situ chemical oxidation (ISCO) using permanganate is a promising technology for remediating groundwater and soil contaminated by chlorinated solvents present as dense non-aqueous phase liquids (DNAPLs). However, there remain gaps in knowledge about ISCO effects on mass depletion from complex DNAPL source zones of MnO2(s) formation, impacting field application the technology. Further, simulation tool needed studying under typical conditions. A 2D experiment was performed investigating zone composed tetrachloroethylene (PCE) within simulated aquifer, to qualitatively understand permeability, generate quantitative data model testing. Hydraulic head aqueous concentrations were monitored cores analyzed evaluate permeability rate changes due saturation formation. For this experiment, formation depended partly configuration, did not noticeably reduce or alter flow patterns until exceeding 0.1g MnO2(s)/kg soil. Oxidation configuration (ganglia versus pool location ganglia related pool); dramatically different than lone residual source, highlighting importance architecture characterization performance an application. The Chemical Reactive Transport 3D (CORT3D) code developed decision simulating ISCO, tested modeling experiments focusing important processes. Simulations confirmed accounting changing multiple natural oxidant demand (NOD) fractions. also verified can increase PCE more be attributed solely increased concentration gradient.