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Title: Geobacter sp. Strain IAE Dihaloeliminates 1,1,2-Trichloroethane and 1,2-Dichloroethane

Journal Article · · Environmental Science and Technology
 [1]; ORCiD logo [2];  [3];  [3];  [4];  [4];  [5]; ORCiD logo [6]; ORCiD logo [7]
  1. Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Shenyang (China)
  2. Chinese Academy of Sciences (CAS), Beijing (China)
  3. Univ. of Chinese Academy of Sciences, Shenyang (China); Univ. of Chinese Academy of Sciences, Beijing (China)
  4. Univ. of Tennessee, Knoxville, TN (United States)
  5. Friedrich Schiller Univ., Jena (Germany)
  6. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  7. Univ. of Chinese Academy of Sciences, Shenyang (China)

We report that chlorinated ethanes, including 1,2-dichloroethane (1,2-DCA) and 1,1,2-trichloroethane (1,1,2-TCA), are widespread groundwater contaminants. Enrichment cultures XRDCA and XRTCA derived from river sediment dihaloeliminated 1,2-DCA to ethene and 1,1,2-TCA to vinyl chloride (VC), respectively. The XRTCA culture subsequently converted VC to ethene via hydrogenolysis. Microbial community profiling demonstrated the enrichment of Geobacter 16S rRNA gene sequences in both the XRDCA and XRTCA cultures, and Dehalococcoides mccartyi (Dhc) sequences were only detected in the ethene-producing XRTCA culture. The presence of a novel Geobacter population, designated as Geobacter sp. strain IAE, was identified by the 16S rRNA gene-targeted polymerase chain reaction and Sanger sequencing. Time-resolved population dynamics attributed the dihaloelimination activity to strain IAE, which attained the growth yields of 0.93 ± 0.06 x 107 and 1.18 ± 0.14 x 107 cells per μmol Cl-1 released with 1,2-DCA and 1,1,2-TCA as electron acceptors, respectively. In contrast, Dhc growth only occurred during VC-to-ethene hydrogenolysis. Our findings discover a Geobacter sp. strain capable of respiring multiple chlorinated ethanes and demonstrate the involvement of a broader diversity of organohalide-respiring bacteria in the detoxification of 1,2-DCA and 1,1,2-TCA.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Shenyang (China)
Sponsoring Organization:
USDOE; National Key Research and Development Program of China; Natural Science Foundation of China; Liaoning Revitalization Talents Program; Chinese Academy of Sciences; University Consortium for Field-Focused Groundwater Research
Grant/Contract Number:
AC05-00OR22725; 2018YFC1800704; 2019YFC1804400; 41977295; 41907287; XLYC1807139; ZDBS-LY-DQC038
OSTI ID:
1860551
Journal Information:
Environmental Science and Technology, Vol. 56, Issue 6; ISSN 0013-936X
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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