Biotechnology and Bioprocess Engineering:BBE

The Korean Society for Biotechnology and Bioengineering (한국생물공학회)
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Biological Removal of Explosive 2,4,6-Trinitrotoluene by Stenotrophomonas sp. OK-5 in Bench-scale Bioreactors

  • Oh, Kye-Heon (Department of Life Science, Soonchunhyang University) ;
  • Lee, Myung-Seok (Department of Life Science, Soonchunhyang University) ;
  • Chang, Hyo-Won (Department of Life Science, Soonchunhyang University) ;
  • Kahng, Hyung-Yeel (Research Institute for Basic Science, Cheju National University) ;
  • So, Jae-Seong (Department of Biotechnology, Inha University)
  • Published : 2002.03.01
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Abstract

The biological removal of 2,4,6-trinitrotoluene (TNT) was studied in a bench-scale bioreactor using a bacterial culture of strain OK-5 originally Isolated from soil samples contaminated with TNT. The TNT was completely removed within 4 days of incubation in a 2.5 L bench-scale bioreactor containing a newly developed medium. The TNT was catabolized in the presence of different supplemented carbons. Only minimal growth was observed in the killed controls and cultures that only received TNT during the incubation period. This catabolism was affected by the concentration ratio of the substrate to the biomass. The addition of various nitrogen sources produced a delayed effect for the TNT degradation. Tween 80 enhanced the degradation of TNT under these conditions. Two metabolic intermediates were detected and identified as 2-amino-4, 6-dinitrotoluene and 4-amino-2, 6-dinitrotoluene based on HPLC and GC-MS analyses, respectively. Strain OK-5 was characterized using the BIOLOG system and fatty acid profile produced by a microbial identification system equipped with a Hewlett Packard HP 5890 II gas chromatograph. As such, the bacterium was identified as a Stenotrophomonas species and designated as Stenotrophomonas sp. OK-5.

Keywords

References

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