Inhibition of Reductive Dechlorination by Sulfate Reduction in Microcosms (Abstract)

摘要

High sulfate (>1,000 mg/L) concentrations are potentially problematic for field im- plementation of in situ bioremediation of chlorinated ethenes because its reduction com- petes for electron donor with reductive dechlorination. As a result of this competition, reductive dechlorination of chlorinated ethenes may be inhibited. The Source Area Bio- remediation (SABRE) project is an international collaboration of twelve companies, two government agencies and three research institutions. The project is chartered to determine if enhanced anaerobic bioremediation can result in effective and quantifiable treatment of the chlorinated solvent DNAPL source areas as demonstrated in a field-scale pilot pro- ject. At sites such as the SABRE field site where sulfate is high, the electron donor de- mand associated with sulfate must be understood to ensure that adequate electron donor is present to support reduction of chlorinated ethenes and sulfate. As part of a significant laboratory effort conducted by the SABRE group in support of the planned field project, we evaluated the impact of high sulfate concentrations (circa 1,000 mg/L) on electron donor consumption and reductive dechlorination of trichloroethene (TCE).