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Aerojet In Situ Bioremediation Field DemonstrationSan 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 the SERDP in situ bioremediation field demonstration. The site is underlain by an alluvial aquifer consisting of interbedded silts, sands, and gravel, with the water table present at 20 feet bgs. Groundwater chemistry consists of the following: perchlorate = 15 mg/L; nitrate = 5 mg/L; sulfate = 10 mg/L; oxygen = 4 mg/L; redox potential = +200 mV; TCE = 3 mg/L; and pH = 6.8. At the site, the perchlorate plume is co-mingled with TCE, and the pilot was undertaken to determine if these contaminants could be jointly bioremediated. After demonstration at the microcosm level, the in situ anaerobic bioremediation of perchlorate and TCE pilot project was initiated in May 2000. The target aquifer was located 100 feet bgs. The goal of the pilot was to control migration of the 800-foot wide perchlorate/TCE plume. The field demonstration was designed as a closed loop (65 feet), with a re-circulation rate of 5-10 gpm, and a residence time of 21 days. One nutrient delivery well and one extraction well were utilized, and two biomonitor wells were located between the delivery and extraction wells, in a straight-line pattern. In the biomonitor well located 15 feet from the nutrient delivery well, perchlorate was reduced from about 10 mg/L to about 1 mg/L in about 11-12 days. In the biomonitor well located 35 feet from the nutrient delivery well, perchlorate was reduced from about 10 mg/L to about 1 mg/L in about 18-20 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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