Bioavailability and reductive dechlorination of sediment-bound chlorinated benzenes
Conference
·
OSTI ID:20014892
An enriched, methanogenic culture was developed using an estuarine sediment contaminated with hexachlorobenzene (HCB) as inoculum. The enriched microbial consortium transformed all chlorobenzene congeners with three or more chlorine substituents. Transformation of each compound resulted in the accumulation of dichlorobenzene isomers. The Michaelis-Menten enzyme kinetics model was used to describe the reductive dechlorination of each chlorobenzene and used to describe the sequential reductive dechlorination of HCB to dichlorobenzene. The enriched culture was then used to inoculate two sediment slurry microcosms prepared with sediment samples to evaluate the bioavailability of the sediment-sorbed HCB in the native system. The chlorobenzene concentrations in these two microcosms over time were compared to azide-amended, abiotic systems in which Tenax TA resin was used to remove the desorbing compound. Based on the results of these assays, it was concluded that the overall transformation rate of the sediment-bound HCB is limited by its desorption from the sediment matrix.
- Research Organization:
- Georgia Inst. of Tech., Atlanta, GA (US)
- OSTI ID:
- 20014892
- Country of Publication:
- United States
- Language:
- English
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