Evaluation of strategies for anaerobic bioremediation of high concentrations of halomethanes

Water Research
Huifeng ShanDavid L Freedman

Abstract

Bioremediation is being considered for groundwater at an industrial site contaminated with carbon tetrachloride (CT), trichlorofluoromethane (CFC-11), and chloroform (CF), at concentrations typically considered too high for biological treatment. 1,1-Dichloroethene is also present. The objective of this study was to evaluate in situ anaerobic remediation by biostimulation alone (lactate, emulsified vegetable oil, and corn syrup), biostimulation (corn syrup) supplemented with vitamin B(12) (cyanocobalamin), and bioaugmentation in combination with catalytic levels of B(12). Three cultures were evaluated for enhancing biotransformation of CT, CFC-11 and CF: two were sulfate reducing enrichments (grown on lactate and ethanol, respectively), based on a high concentration of sulfate in the groundwater; the other was a fermentative enrichment grown on corn syrup. A microcosm study with soil and groundwater (neutralized to pH 7) from the site revealed that bioaugmentation is a potentially feasible treatment approach, with complete biotransformation of 8.8mg/L CT, 26mg/L CFC-11, and 500mg/L of CF in approximately 500days. The lactate-grown sulfate reducing culture and the corn syrup-grown fermentative culture were the most effective. Sub...Continue Reading

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