Surfactant enhanced removal of PCE in a partially saturated, stratified porous medium

摘要

Dense nonaqueous phase liquids(DNAPLs), such as perchloroethylene(PCE), pose a signifi- cant threat to the environment, specifically to our drinking water present in aquifers. In many instances, a DNAPL will become trapped and form pools on top of confining layers while migrating through the vadose zone. Residual DNAPL and DNAPL pools form sources of long term contamination, which are difficult to removal by classical pump-and-treat remediation. A physically simulated PCE spill into a large, two-dimensional flow container, packed with a fine sand layer surrounded by coarse sand, was therefore studied in this work.