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Dechlorination of High Concentrations of Tetrachloroethylene Using a Fixed-bed Reactor
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  • Dechlorination of High Concentrations of Tetrachloroethylene Using a Fixed-bed Reactor
  • Dechlorination of High Concentrations of Tetrachloroethylene Using a Fixed-bed Reactor
저자명
Chang. Young-C.,Park. Chan-Koo,Jung. Kweon,Kikuchi. Shintaro
간행물명
韓國環境保健學會誌
권/호정보
2010년|36권 4호|pp.323-336 (14 pages)
발행정보
한국환경보건학회
파일정보
정기간행물|ENG|
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이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
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기타언어초록

We evaluated the properties of a fixed-bed column reactor for high-concentration tetrachloroethylene (PCE) removal. The anaerobic bacterium Clostridium bifermentans DPH-1 was able to dechlorinate PCE to cis-1,2-dichloroethylene (cDCE) via trichloroethylene (TCE) at high rates in the monoculture biofilm of an upflow fixed-bed column reactor. The first-order reaction rate of C. bifermentans DPH-1 was relatively high at $0.006;mg;protein^{-1}{cdot}l{cdot}h^{-1}$, and comparable to rates obtained by others. When we gradually raised the influent PCE concentration from $30;{mu}M$ to $905;{mu}M$, the degree of PCE dechlorination rose to over 99% during the operation period of 2,000 h. In order to maintain efficiency of transformation of PCE in this reactor system, more than 6 h hydraulic retention time (HRT) is required. The maximum volumetric dechlorination rate of PCE was determined to be $1,100;{mu}mol{cdot}d^{-1}l$ of reactor $volume^{-1}$, which is relatively high compared to rates reported previously. The results of this study indicate that the PCE removal performance of this fixed-bed reactor immobilized mono-culture is comparable to that of a fixed-bed reactor mixture culture system. Furthermore, our system has the major advantage of a rapid (5 days) start-up time for the reactor. The flow characteristics of this reactor are intermediate between those of the plug-flow and complete-mix systems. Biotransformation of PCE into innocuous compounds is desirable; however, unfortunately cDCE, which is itself toxic, was the main product of PCE dechlorination in this reactor system. In order to establish a system for complete detoxification of PCE, co-immobilization of C. bifermentans DPH-1 with other bacteria that degrade cDCE aerobically or anaerobically to ethene or ethane may be effective.