Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Characterization of TCE-Degrading Bacteria and Their Application to Wastewater Treatment

  • Lee, Wan-Seok (Department of Agricultural Chemistry, Kyungpook National University) ;
  • Park, Chan-Sun (Biomolecular Process Engineering Laboratory, Korea Research Institute of Bioscience and Biotechnology) ;
  • Kim, Jang-Eok (Department of Agricultural Chemistry, Kyungpook National University) ;
  • Yoon, Byung-Dae (Biomolecular Process Engineering Laboratory, Korea Research Institute of Bioscience and Biotechnology) ;
  • Oh, Hee-Mock (Biomolecular Process Engineering Laboratory, Korea Research Institute of Bioscience and Biotechnology)
  • Published : 2002.08.01
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Abstract

Two bacterial strains capable of degrading trichloroethylene (TCE), isolated form soils contaminated with various chlorinated alkenes, were identified as Alcaligenes odorous N6 and Nocardia sp. Hl7. In addition, four KCTC strains, including three strains of Pseudomonas putida and one strain of Sphingomonas chlorophenolica, exhibited an ability to degrade toluene. A. odorans N6 and Nocardia sp. H17 degraded 84% of the initial amount of TCE in a basal salts medium (BSM), containing 0.2 mM TCE as the sole source of carbon and energy, in a day. The optimal pH for growth was within a range of 7.0-8.0. A mixed culture of the four toluene-degrading isolates degraded 95% of 0.2 mM TCE with 1.5 mM toluene as an inducer, whereas no TCE was degraded by the same mixture without an inducer. When a mixed culture of all 6 isolates was used, the degradation efficiency of 0.2 mM TCE was 72% without an inducer, in a day, and 82% with toluene as an inducer. In a continuous treatment, 1,000 mg/1 of TCE in an artificial wastewater was completely removed within 18 h when an activated sludge was used along with the microbial mixture, which was 27 h laster than when only an activated sludge was used. Accordingly, it would appear that such a microbial mixture could be effectively applied to the biological treatment of wastewater containing TCE with or without an inducer.

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