Superfund Innovative Technology Evaluation (SITE)
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In support of the U.S. Environmental Protection Agency's (EPA) Superfund Innovative Technology Evaluation (SITE) Program, this report evaluates the AWD Technologies, Inc., integrated AquaDetox® /SVE treatment system for simultaneous on-site treatment of contaminated groundwater and soil-gas. The AWD technology uses an AquaDetox® moderate vacuum steam stripping system to treat contaminated groundwater and a soil vapor extraction (SVE) system that uses granular activated carbon (GAC) beds to treat soilgas. The two systems are looped together to form a closed system with no emissions. This report evaluates both the treatment efficiency and economic data based on results from the SITE demonstration and describes several case studies.
Under the SITE Program, the AWD technology was demonstrated at the Lockheed site in Burbank, California, in September 1990. The groundwater and soil at the Lockheed site were contaminated with volatile organic compounds (VOC), primarily trichloroethylene (TCE) and tetrachloroethylene (PCE). Extensive sampling and analyses were performed on the groundwater and soil-gas before and after treatment so that system removal efficiencies could be calculated. All sampling and analyses were performed according to quality assurance guidelines outlined by the SITE Program.The 2-week long SITE demonstration consisted of 21 test runs performed under varying operating conditions. Four operating parameters were varied including: groundwater flow rate, steam flow rate, stripping tower pressure, and GAC bed regeneration frequency. The AWD technology was evaluated based on the removal efficiencies achieved for removal of TCE and PCE from contaminated groundwater and soil-gas. The technology was also evaluated based on compliance of the effluent groundwater with the regulatory discharge requirements at the Lockheed site.
The conclusions drawn from these evaluations are: (1) the system can effectively treat VOC contaminated groundwater and soil-gas; (2) VOC removal efficiencies as high as 99.99 percent can be achieved for groundwater; (3) soil-gas VOC removal efficiencies as high as 99.9 percent can be achieved; (4) the effluent groundwater was in compliance with the regulatory discharge requirements of 5 µg/L each for TCE and PCE throughout the demonstration; (5) the system operates more efficiently at lower stripping tower pressures; and (6) the l,OOO-gallons per minute system at Lockheed has an estimated capital cost of $4.3 million and annual operating and maintenance costs of approximately $820,000.