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Aerojet Bioremdiation of Soil from Former Burn Area by Anaerobic CompostingSan Gabriel, CASource: Cox, E., E. Edwards, S. Neville, M. Girard, 2000. "Cost-Effective Bioremediation of Perchlorate in Soil and Groundwater" in Perchlorate Treatment Technology Workshop, 5th Annual Joint Services Pollution Prevention & Hazardous Waste Management Conference & Exhibition, August 21-24, 2000, Henry B. Gonzalez Convention Center, San Antonio, Texas. Project Summary: The following text was excerpted from Cox, E., E. Edwards, S. Neville, M. Girard, 2000. "Cost-Effective Bioremediation of Perchlorate in Soil and Groundwater" in Perchlorate Treatment Technology Workshop, 5th Annual Joint Services Pollution Prevention & Hazardous Waste Management Conference & Exhibition, August 21-24, 2000, Henry B. Gonzalez Convention Center, San Antonio, Texas: The Aerojet Superfund Site, California was selected for a pilot demonstration anaerobic composting of soils from the former perchlorate burn area. In this area, perchlorate concentrations up to 4,200 mg/kg were detected. Soils consis< of low permeability, silty clay soil. The remedial goal was to prevent perchlorate infiltration to groundwater at concentrations exceeding the preventive action limit of 18 ppb. Bench-scale studies showed that degradation half-lives were on the order of 2 to 4 days, and treatment and bioaugmented treatment both resulted in perchlorate reduction from 22-28 mg/kg to <3 mg/kg after 20 days. The compost pile dimensions for the field demonstration were 7 feet at the base, and a maximum 5 foot height. A plastic liner was emplaced beneath the pile, and clean soil berms were constructed around the circumference to contain potential leachate. A second pile was left unlined. A plastic tarp covered the top of the pile, and temperature and moisture probes were installed within the pile to measure these parameters using a datalogger. The field results showed that for both the lined and the unlined compost pile, perchlorate concentrations were reduced from about 23 mg/kg to near the PQL of 0.1 mg/kg in about seven days; the degradation half-life was determined to be one to two days. Additional Info Source: Cox, E., E. Edwards, S. Neville, M. Girard, 2000. "Cost-Effective Bioremediation of Perchlorate in Soil and Groundwater" in Perchlorate Treatment Technology Workshop, 5th Annual Joint Services Pollution Prevention & Hazardous Waste Management Conference & Exhibition, August 21-24, 2000, Henry B. Gonzalez Convention Center, San Antonio, Texas. |
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