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Rocket Manufacturing Site Soil Bioremediation by Anaerobic CompostingBay Area, 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: A Rocked Manufacturing Site, California was selected for a pilot demonstration anaerobic composting of soils from an active perchlorate grinder station. In this area, perchlorate concentrations up to 2,100 mg/kg were detected. Soils consist of low permeability, silty soil. The remedial goal was to prevent perchlorate impacts to surface water via overland flow during storm events. Bench-scale studies showed that using a 1:1 soil to compost ration, perchlorate was reduced from about 700 mg/kg to 0.24 mg/kg in about 90 days, and using a 1:10 soil to compost ratio, perchlorate was reduced from about 100 mg/kg to <0.1 mg/kg in about 70 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 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 perchlorate concentrations were reduced from about 170 mg/kg to levels consistently less than 0.64 mg/kg in about 38 days. The degradation half life was determined to be two to four 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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