U.S. EPA Superfund Innovative Technology Evaluation (SITE) Program
Chemical and Biological Treatment (CBT)
Institute of Gas Technology (IGT)

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Chemical and Biological Treatment (CBT), Institute of Gas Technology (IGT) (62KB)

Abstract

The IGT CBT process treats organic contaminants, such as polynuclear aromatic hydrocarbons (PAH) and polychlorinated biphenyls (PCB) in soil, sludges groundwater, and surface water. Chemical oxidation is used as a pretreatment followed by aerobic and anaerobic biosystems in sequence or alone, depending on the waste. A full-scale, mobile, continuous-flow unit cleans sand, silt, clay, and sludge particles smaller than 10 mesh at a rate of 20 to 40 yds³/hr. The process consists of equipment for particle sizing, soil and sediment washing units, and water treatment and reconditioning equipment. The sediment washing unit includes a mixing chamber and scrubber to loosen the bonds between pollutants and the particles. Settling tanks and hydrocyclones are used to improve particle separation. Solids are sent to a treated soil pile. Liquids are treated and recycled to the plant for reuse. The technology extracts inorganics, volatile and non-volatile organic contaminants, PCBs, and pesticides. In November 1992, this technology was demonstrated on weathered crude oil at a refinery site in Minnesota. Approximately 85 percent of the total recoverable hydrocarbons (TRPH) were removed.

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Posted October 1, 1999

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