Abstract
ABSTRACT There has been considerable interest in the use of Fe(0) for the treatment of highly chlorinated aliphatic hydrocarbons (CAHs). Because early field studies found little biological contribution to degradation, much of the recent research has focused on abiotic processes. However, previous experiments in our laboratory have demonstrated that the rate and extent of carbon tetrachloride (CT) and chloroform (CF) degradation were enhanced when Fe(0) and methanogenic enrichment or methanogenic pure cultures were incubated together. In this study, acetate- or lactate-enriched methanogenic cultures were added to columns containing a steel wool support medium. Fe(0) served as the sole exogenous electron donor. CT, tetrachloroethene (PCE), and 1,1,1,-trichlorothane (1,1,1,-TCA) were fed to columns alone and in mixtures in reduced mineral medium. Columns were operated for periods of up to 90 months. Based on extent of dechlorination, an enhancement was observed for CT and 1,1,1-TCA when methanogenic enrichme...
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