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ENHANCED BIOREMEDIATION OF SOLVENTS IN A FRACTURED ROCK AQUIFER
Citation:
Carter, G. L., R. Kryczkowski, AND V Gallardo*. ENHANCED BIOREMEDIATION OF SOLVENTS IN A FRACTURED ROCK AQUIFER. Presented at EPA Science Forum 2002: Meeting the Challenges, Ronald Reagan International Trade Center, Washington, D.C, May 1 and 2, 2002.
Description:
This poster summarizes results of a technology evaluation that was conducted in conjunction with ITT Industries, Earth Tech, Inc., and the US EPA SITE program. The technology evaluated was Enhanced In Situ Bioremediation. The technology was developed at the Department of Energy's Savannah River Site and licensed by Earth Tech for commercial application.
The poster contains data collected under the SITE project but also includes data collected after the SITE project had been completed. The enhanced bioremediation system was used to treat groundwater contamination located in fractured bedrock. The project was located at the ITT industries Night Vision Plant in Roanoke, VA. The process includes the subsurface injection of air, gaseous nutrients and methane to stimulate the naturally existing microbial population to destroy volatile organic compounds (VOCs) in the groundwater. The major contaminants were acetone, isopropanol, trichloroethylene, cis 1,2 dichloroethylene, vinyl chloride, 1,1,1 Trichlroethane, 1,1 dichloroethane, and chloroethane.
During the SITE demonstration VOC reductions in the fractured bedrock were observed on the order of 75 % within a 6 to 18 month period. Following the SITE demonstration, the system was expanded to full scale and further VOC reductions were observed. Earth Tech data show that 90 - 99.99% reductions in VOCs were achieved.