Journal of the Korean Applied Science and Technology (한국응용과학기술학회지)

The Korean Society of Applied Science and Technology (한국응용과학기술학회)
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The Effect of Chlorinated Ethenes and Electron Donor on VC Dehalogenation Rate

염화에텐류 화합물 및 전자공여체가 VC 탈염소화 속도에 미치는 영향

  • Bae, Jae-Ho (Department of Environmental Engineering, Inha University) ;
  • Lee, Il-Su (School of Chemical, Bio, and Environmental Engineering, Oregon State University) ;
  • Park, Young-Koo (Department of Environmental Disaster Prevention Engineering, Kangwon National University) ;
  • Semprini, Lewis (School of Chemical, Bio, and Environmental Engineering, Oregon State University)
  • 배재호 (인하대학교 환경공학과) ;
  • 이일수 (오레곤주립대학교 화학생물환경공학과) ;
  • 박영구 (강원대학교 환경방재공학과) ;
  • Published : 2007.12.31
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Abstract

Anaerobic reductive dehalogenation of perchloroethene (PCE) was studied with lactate as the electron donor in a continuously stirred tank reactor (CSTR) inoculated with a mixed culture previously shown to dehalogenate vinyl chloride (VC). cis-1,2- dichloroethene (cDCE) was the dominant intermediate at relatively long cell retention times (>56 days) and the electron acceptor to electron donor molar ratio (PCE:lactate) of 1:2. cDCE was transformed to VC completely at the PCE to lactate molar ratio of 1:4, and the final products of PCE dehalogenation were VC (80%) and ethene (20%). VC dehalogenation was inhibited by cDCE dehalogenation. Propionate produced from the fermentation of lactate might be used as electron donor for the dehalogenation. Batch experiments were performed to evaluate the effects of increased hydrogen, VC, and trichloroethene (TCE) on VC dehalogenation which is the rate-limiting step in PCE dehalogenation The addition of TCE increased the VC dehalogenaiton rate more than an increase in the $H_2$ concentration, which suggests that the introduction of TCE induces the production of an enzyme that can comtabolize VC.

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References

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