Perfluoroalkyl Acids Inhibit Reductive Dechlorination of Trichloroethene by Repressing Dehalococcoides
- 21 December 2015
- journal article
- research article
- Published by American Chemical Society (ACS) in Environmental Science & Technology
- Vol. 50 (1) , 240-248
Abstract
The subsurface recalcitrance of perfluoroalkyl acids (PFAAs) used in aqueous film-forming foams could have adverse impacts on microbiological processes used for the bioremediation of comingled chlorinated solvents such as trichloroethene (TCE). Here we show that reductive dechlorination by a methanogenic, mixed culture was significantly inhibited when exposed to concentrations representative of PFAA source zones (>66 mg/L total of 11 PFAA analytes, 6 mg/L each). TCE dechlorination, cis-dichloroethene, and vinyl chloride production and dechlorination, and ethene generation were all inhibited at these PFAA concentrations. Phylogenetic analysis revealed that the abundances of 65% of the operational taxonomic units (OTUs) changed significantly when grown in the presence of PFAAs, although repression and/or enhancement resulting from PFAA exposure did not correlate with putative function or phylogeny. Notably, there was significant repression of Dehalococcoides (8-fold decrease in abundance) coupled with a cor...Keywords
Funding Information
- U.S. Environmental Protection Agency (ER2126)
- U.S. Department of War (ER2126)
- U.S. Department of Energy (ER2126)
- Division of Chemical, Bioengineering, Environmental and Transport Systems (CBET-1055396)
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