A Demonstration of In-Situ Thermal Desorption-Destruction of PCB's in Contaminated Soils at Mare Island Shipyard
Technical data sheet
NAVAL FACILITIES ENGINEERING SERVICE CENTER PORT HUENEME CA
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TerraTherm Environmental Services, Inc. and RT Environmental Services, Inc. conducted a successful field demonstration of In-Situ Thermal Desorption ISTD sponsored by the Bay Area Defense Conversion Action Team Environmental Technology Partnership. The ISTD technology uses the direct application of heat supplied by electrical heater elements to raise the temperature of soil in-situ to destroy the organic contaminant targeted. Two configurations of the heating elements are the Thermal Blankets, which treat surface soil up to 18 inches deep, and the Thermal Wells, which are drilled vertically or horizontally to treat deep or hard-to-reach areas. Both ISTD configurations were demonstrated at Mare Island Shipyard in Vallejo, California. The advantages of TerraTherms ISTD technology provides benefits not found in conventional remediation techniques that outweigh the limitations. The goals of the demonstration were to gain further evidence on the performance of ISTD to destroy and remove PCBs to well below 2 mgkg and to obtain cost estimate data. Verification sampling results showed that TerraTherm met the 2 mgkg goal by achieving non-detect readings in all areas tested. Continuous air monitoring from the stack showed all emissions within allowable limits, as was ambient HCl levels. The project was concluded in November 1997. Previous demonstrations of ISTD have been conducted at a PCB contamination at a state superfund site in New York and a federal superfund site in Missouri, and a chlorinated solvent contamination site in Indiana. The cost of ISTD depends on a variety of factors such as depth of contamination, soil moisture and contaminant types.
- Solid Wastes and Pollution and Control