On-Site Thermal Desorption of PCP- and Dioxin-Contaminated Soil at the Coleman-Evans Wood Preserving Site, Whitehouse, Florida, USA

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Courtesy of Weston Solutions, Inc

ABSTRACT

Roy F. Weston, Inc. (WESTON®) has designed an indirect thermal desorption process (known as the LT3-HT) to treat solids and sludges contaminated with hazardous and toxic materials. The LT3-HT is a high-temperature, high-capacity thermal desorption system designed for treatment of semivolatile and volatile organic contaminants that require high treatment temperatures. The LT3-HT includes WESTON’s original and patented thermal desorption technology to dry the feed material, via indirect heat transfer, prior to conveying the contaminated soil to the second-stage desorption process, which elevates the soil to the desired treatment temperatures. The second-stage desorption process is comprised of an indirectly heated chamber that heats the feed material up to 1,000 °F to evaporate the contaminants from the solid matrix. The desorbed vapors are filtered to remove particulate matter and then passed through an air pollution control system that condenses the evaporated organic contaminants and water. The contaminants are then easily separated from the liquid condensate.

The U.S. Army Corps of Engineers (USACE) and The IT Group selected WESTON as a subcontractor to perform the on-site treatment of 65,000 dry tons of pentachlorophenol (PCP)- and dioxin-contaminated soil at the Coleman-Evans Superfund site in Whitehouse, Florida, USA. The thermal desorption system will complete a rigorous Proof of Performance (POP) Test Program. Following the Proof of Performance Test, operations are expected to continue through the end of the year 2000. This paper describes the technical and regulatory challenges associated with the thermal treatment of PCP- and dioxincontaminated soil.

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