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SOIL WASHING WITH A MICELLAR SOLUTION: FIELD TEST AT A GAS STATION (LAVAL, QUÉBEC, CANADA)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.]
http://www.esaa-events.com/remtech/2010/pdf/10-Grenier.pdf
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