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IN-SITU BIOTRANSFORMATION OF CARBON TETRACHLORIDE UNDER ANOXIC CONDITIONS
Citation:
Semprini, L., G. Hopkins, D. Janssen, M. Lang, P. Roberts, AND P. McCarty. IN-SITU BIOTRANSFORMATION OF CARBON TETRACHLORIDE UNDER ANOXIC CONDITIONS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/2-90/060 (NTIS PB91148346), 1990.
Description:
This field and laboratory project evaluated the possibility of stimulating a native bacterial population to biotransform carbon tetrachloride (CT) under anoxic conditions. In addition,the transformation of 1,1,1-trichloroethane (TCA), Freon-11, and Freon-113 present as background contaminants in the test zone groundwater were also evaluated. fter biostimulation by injection of acetate into a shallow confined aquifer consisting of unconsolidated alluvial sand, the following degrees of transformation were observed: T, 95%; TCA, 15%; Freon-11, 68%; Freon-113, 20%. hese biotransformations were achieved in a biostimulated zone within 2 meters of the injection point. Laboratory and mathematical modeling were also considered. Mathematical modeling of the transport and transformation process confirmed that the behavior observed in the field demonstration was consistent with the results of the laboratory research and theoretical expectations. he project demonstrated this technology to be effective in continuous operation under carefully controlled conditions in a real subsurface environment at small scale, and is a viable candidate for consideration at real contamination sites where conditions are favorable.
