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Aerobic and Anaerobic Biodegradation of 1,2-Dibromoethane by a Microbial Consortium under Simulated Groundwater Conditions

Author

Listed:
  • Qing Wang

    (Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 21008, China)

  • Miaoyan Yang

    (Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 21008, China
    University of Chinese Academy of Sciences, Beijing 100049, China
    These authors contributed equally to this work and should be considered co-first authors.)

  • Xin Song

    (Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 21008, China)

  • Shiyue Tang

    (Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 21008, China
    University of Chinese Academy of Sciences, Beijing 100049, China)

  • Lei Yu

    (Department of Environmental Engineering, Nanjing Forestry University, Nanjing 210037, China)

Abstract

This study was conducted to explore the potential for 1,2-Dibromoethane (EDB) biodegradation by an acclimated microbial consortium under simulated dynamic groundwater conditions. The enriched EDB-degrading consortium consisted of anaerobic bacteria Desulfovibrio , facultative anaerobe Chromobacterium , and other potential EDB degraders. The results showed that the biodegradation efficiency of EDB was more than 61% at 15 °C, and the EDB biodegradation can be best described by the apparent pseudo-first-order kinetics. EDB biodegradation occurred at a relatively broad range of initial dissolved oxygen (DO) from 1.2 to 5.1 mg/L, indicating that the microbial consortium had a strong ability to adapt. The addition of 40 mg/L of rhamnolipid and 0.3 mM of sodium lactate increased the biodegradation. A two-phase biodegradation scheme was proposed for the EDB biodegradation in this study: an aerobic biodegradation to carbon dioxide and an anaerobic biodegradation via a two-electron transfer pathway of dihaloelimination. To our knowledge, this is the first study that reported EDB biodegradation by an acclimated consortium under both aerobic and anaerobic conditions, a dynamic DO condition often encountered during enhanced biodegradation of EDB in the field.

Suggested Citation

  • Qing Wang & Miaoyan Yang & Xin Song & Shiyue Tang & Lei Yu, 2019. "Aerobic and Anaerobic Biodegradation of 1,2-Dibromoethane by a Microbial Consortium under Simulated Groundwater Conditions," IJERPH, MDPI, vol. 16(19), pages 1-15, October.
    • Handle: RePEc:gam:jijerp:v:16:y:2019:i:19:p:3775-:d:274109
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