Capture and Cleanup of a Migrating VOC Plume by the
In-Well Vapor Stripping: A Sand Tank Experiment

Yoram Katz and Haim Gvirtzman

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Figure 1Figure 2

The capture and removal of a continuously produced, migrating VOC plume are demonstrated in a sandbox model using the in-well vapor stripping system. The transport and removal processes are analyzed using a laboratory-scale aquifer setup and numerical modeling. The spatial and temporal concentration variations of 3 VOCs (trichloroethylene, toluene and chloroform) and one non-volatile tracer (potassium) were determined using eight quadruple-level samplers evenly positioned throughout the model aquifer. The electrical conductivity of the K+-spiked water was continuously monitored using electrodes placed near the 32 sampling points. Laboratory results were numerically reproduced using 3-D flow and transport modeling combined with VOC volatilization and removal. The experiment was designed such that it was possible to distinguish (downgradient) between two groundwater bodies; the upper that was captured by the stripping-well, and the lower unaffected by the remediation system. Thereby, the primary factors of efficiency of this remediation technique were evaluated.

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