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SURFACTANT ENHANCED AQUIFER REMEDIATION WITH SURFACTANT REGENERATION/REUSE
Citation:
Vane*, L M. AND S. L. Yeh. SURFACTANT ENHANCED AQUIFER REMEDIATION WITH SURFACTANT REGENERATION/REUSE. Presented at NATO/CCMS Pilot Study, Liege, Belgium, 9/9-15/2001.
Description:
A demonstration of surfactant-enhanced aquifer remediation was conducted during the spring of 1999 at Marine Corps Base, Camp LeJeune, NC. A PCE-DNAPL zone was identified and delineated by extensive soil sampling in 1997, and was further characteized by a partitioning interwell tracer test in 1998. Site 88, is the location of the central dry cleaning facility for the Base. The DNAPL zone is located in a shallow aquifer beneath the dry cleaning facility at a depth of approximately 17-20 ft below ground surface (ft bgs). A thick clay aquitard is present at about 20 fr bgs, which has effectively prevented further downward DNAPL migration at this site. The shallow aquifer is characterized as a relatively low-permeability formation composed of fine to very-fine sand, with a fining downward sequence in the bottom two feet of the aquifer. The bottom, fine-grained zone, referred to as the basal slt layer, grades to silt then clayey silt before contacting the aquitard. permeability decreases downward through the basal silt layer as a function of decreasing grain size with depth. DNAPL was present in the test zone as free-phase and residual DNAPL in the fine sand and basal silt. Recovery of free-phase DNAPL was undertaken before the PITT by conventional pumping and water flooding. This presentation will discuss this project.