U.S. EPA Superfund Innovative Technology Evaluation (SITE) Program
Integrated AquaDetox ^®/Soil Vapor Extraction (SVE)
AWD Technologies, Inc. (AWD)

Abstract

AWD developed the AquaDetox^®/SVE technology to simultaneously extract volatile organic contaminants (VOCs) from soil and volatile or semi-volatile organics from groundwater. The technology integrates: 1) a high-efficiency stripping tower (>50 mm Hg) that uses low pressure steam to treat extracted groundwater, and 2) an SVE system that extracts contaminated soil gas from in situ soils. The Aqua^®Detox unit, patented by Dow Chemical Company, can be used to remove groundwater contaminants that are normally considered "nonstrippable" (i.e., boiling points in excess of 200^oC). Noncondensable vapors extracted by this system can be combined with SVE vapors and treated by granular activated carbon. A 1,200 gpm and 300 scfm system was demonstrated during the 2-week demonstration in September 1990 at the Lockheed site in Burbank, California. Soil gas concentrations were approximately 10 ppm for trichloroethene (TCE) and 400 ppm for tetrachloroethene (PCE); groundwater concentrations ranged from 400 to 600 µg/L for TCE and 2,000 to 2,500 µg/L for PCE. VOC removal efficiencies for groundwater exceeded 99.92 percent and groundwater effluent met the regulatory goal of 5µg/L. Soil gas removal efficiencies exceeded 98 percent.

Posted July 8, 1999

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