U.S. EPA Contaminated Site Cleanup Information (CLU-IN)

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U.S. EPA Technology Innovation and Field Services Division

Search Result from the December 2010 Issue

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Grenier, M., R. Martel, U. Gabriel, L. Trepanier, C.D.-Rancourt, T. Robert, and J.-M. Lauzon. REMTECH 2010: The Remediation Technologies Symposium, Banff, AB, Canada, 20-22 Oct 2010. Environmental Services Association of Alberta, Edmonton, AB (Canada), 32 slides, 2010

A pilot-scale field test of soil washing with a micellar solution to recover petroleum hydrocarbons at residual saturation took place at a decommissioned gas station. The pilot was launched after a preliminary step of vacuum extraction to remove most of the free-phase product. The micellar solution was introduced into the aquifer through an injection well located in the middle of a 7-spot pattern (6 pumping wells set with a hexagonal pattern). The polymer/micellar solution solubilized the remaining gasoline adsorbed on soil particles or trapped in the porous media, sweeping 40 m3 of contaminated aquifer. The site-specific solution for the contaminant and geological materials was optimized in the lab through phase diagrams and small sand column tests, plus hydrogeological modeling to optimize the injection/pumping ratio. The field test goal was to evaluate the efficiency of soil washing in a heterogeneous medium following a vacuum extraction step at the pilot scale. This paper presents lab and field methodology and results. [NOTE: In the U.S., the in situ application of cleansing agents to soil is known as in situ flushing, while only ex situ applications are referred to as soil washing.]

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