Superfund Innovative Technology Evaluation (SITE)
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|Eco Logic International
Gas-Phase Chemical Reduction Process-The Thermal Desorption Unit Applications
ELI ECO Logic International, Inc.'s Thermal Desorption Unit (TDU) is specifically designed for use with Eco Logic's Gas Phase Chemical Reduction Process. The technology uses an externally heated bath of molten tin in a hydrogen atmosphere to desorb hazardous organic compounds from soils and sludges. Soil inside the TDU floats on top of the molten tin and is heated to 600 C vaporizing the water and organic material. Decontaminated soil is removed from the tin bath into a water-filled quench tank which provides a gas seal between the TDU's hydrogen atmosphere and outside air. Vaporized chemicals are drawn into Eco Logic's proprietary gas-phase reduction reactor where the organic contaminants undergo gas-phase chemical reduction reactions with hydrogen at elevated temperatures and pressures. The TDU is applicable for the treatment of soils and sludges contaminated with polychlorinated biphenyls (PCBs), polynuclear aromatic hydrocarbons, chlorinated dioxins and dibenzofurans, chlorinated solvents, chlorobenzenes, and chlorophenols. When used in conjunction with the gas-phase reduction reactor the system is suited for wastes with high water content since water is a good source of hydrogen. The technology was demonstrated at the Middleground Landfill, Bay City, Michigan, during November and December 1992. Soil containing ~1,000 ppm PCB was fed at 180-55 lb/hr and destruction and removal efficiencies of 99.9999% were achieved for polychlorinated biphenyls with concentrations in clean soil ranging from 8-30 ppm.