• Degradation of Tetrachloroethylene (PCE) by a Dechlorinating Enrichment Culture Fixed in an Anaerobic Reactor
  • Lee Tae Ho;
  • 탈염소화 미생물 부착 혐기성 고정막 반응기에 의한 테트라클로로에틸렌(PCE)의 분해
  • 이태호;
  • 부산대학교 환경기술산업개발연구소;
Abstract
A soil enrichment LYF-1 culture from a contaminated site, which could reductively dechlorinate 900 $\mu$M (ca. 150 mg/L) of tetrachloroethylene (PCE) stoichimetrically into cis-1,2-dichloroethylene (cis-DCE), was established and characterized. The enrichment culture can use yeast extract, peptone, formate, acetate, lactate, pyruvate, citrate, succinate, glucose, sucrose, and ethanol as electron donors for dechlorination of PCE. Addition of NO$_2$$^{[-10]}$ and NO$_3$$^{[-10]}$ as alternative electron acceptors showed complete inhibition of PCE dechlorination, but S$_2$O$_3$$^{-2}$ , SO$_3$$^{-2}$ and SO$_4$$^{-2}$ had no significant effect on PCE dechlorination. The enrichment culture was attached to ceramic media in an anaerobic fixed-bed reactor. The fixed-bed reactor showed more than 99% of PCE degradation in the range of PCE loading rate of 0.13-0.78 $\mu$moles/L/hr. The major end product of PCE dechlorination was cis-DCE.

염화에틸렌 화합물에 오염된 토양으로부터 고농도 (150mg/L)의 PCE를 cis-DCE까지 탈염소화하는 혼합미생물 농화 배양계 LYF-1을 구축하였다. LYF-1은 효모추출물, 펩톤, 포름산, 아세트산, 락트산, 피루브산, 시트르산, 석신산, 글루코오스, 수크로오스, 에탄올 등을 전자공여체로 이용하여 PCE를 탈염소화할 수 있었다. 한편, PCE를 대신할 수 있는 전자 수용체에 의한 PCE 탈염소화에 미치는 영향을 살펴본 결과, NO$_3$$^{-}$와 NO$_2$$^{-}$는 PCE의 탈염소화반응을 완전히 저해하였으나, S$_2$O$_3$$^{-2}$ , SO$_3$$^{-2}$ 및 SO$_4$$^{-2}$ 는 PCE의 탈염소화반응에 그다지 큰 영향을 미치지 않았다. LYF-1 혼합미생물을 혐기성 고정생물막 반응기내의 세라믹 메디아에 부착하고, PCE의 유입부하율 변화에 따른 처리 효율을 조사한 결과, PCE의 부하율 0.13-0.78 $\mu$moles/L/hr의 범위 내에서 99% 이상의 PCE 탈염소화 효율을 보였으며, PCE 탈염소화 반응의 최종산물은 cis-DCE이었다.

Keywords: Tetrachloroethylene(PCE);Dechlorination;Soil enrichment culture;Anaerobic liked bed reactor;

Keywords: 테트라클로로에틸렌;탈염소화;토양 농화배양계;혐기성 고정상 반응기;

References
  • 1. Pankow, J.P., and Cherry J.A., Dense Chlorinated Solvents and Other DNAPLs in Groundwater, Waterloo Press, Ontario, Canada, pp. 1-52 (1996)
  •  
  • 2. Alexander, M., Biodegradation and bioremediation, Academic Press. CA, USA, pp. 248-271 (1994)
  •  
  • 3. De Bruin, W.P., Kotterman, M.J.J., Posthumus, M.A., Schraa, G., and Zehnder, A.J.B., 'Complete biological reductive transformation of tetrachloroethene to ethane', Appl. Environ. Microbiol., 58(6), pp. 1996-2000 (1992)
  •  
  • 4. Maymo-gatell, X., Chien, Y., Gossett, J.M., and Zinder, S.H., 'Isolation of a bacterium that reductively dechlorinates tetrachloroethene to ethene', Science, 276, pp. 1568-1571 (1997)
  •  
  • 5. DiStefano, T.D., Gossett, J.M., and Zinder, S.H., 'Reductive dechlorination of high concentrations of tetrachloroethene to ethene by an anaerobic enrichment culture in the absence of methanogenesis', Appl. Environ. Microbiol., 57(8), pp. 2287-2292 (1991)
  •  
  • 6. Holliger, C., and Schumacher, W., 'Reductive dehalogenation as a respiratory process', Antonie Van Leeuwenhoek, 66, pp. 239-246 (1994)
  •  
  • 7. Semprini, L., 'Strategies for the aerobic co-metabolism of chlorinated solvents', Current Opinion in Biotechnology, 8, pp. 296-308 (1997)
  •  
  • 8. Hopkins, G.D., Semprini, L., and McCarty, P.L., 'Microcosm and in situ field studies of enhanced biotransformation of trichloroethylene by phenol-utilizing microorganisms', Appl. Environ. Microbiol., 59(7), pp. 2277-2285 (1993)
  •  
  • 9. Gerritse, J., Kloetstra, G., Borger, A., Dalsyra, G., Alphenaar, A., and Gottschal, J.C., 'Complete degradation of tetrachloroethene in coupled anoxic and oxic chemostat'", Appl. Microbiol. Biotechnol., 48, pp. 553-562 (1997)
  •  
  • 10. Lee, T.H., Ike, M., and Fujita, M., 'Characterization of an anaerobic soil enrichment culture capable of dechlorinating high concentration of tetrachloroethylene', Wat. Sci. Tech., 36(6-7), pp.117-124 (1997)
  •  
  • 11. Tandol, V., Distefano, T.D., Bowser, P.A., Gosseett, J.M., and Zinder, S.H. 'Reductive dechlorination of chlorinated ethenes and halogenated ethanes by a high-rate anaerobic enrichment culture', Environ. Sci. Technol., 28(5), pp. 973-979 (1994)
  •  
  • 12. Sharma, P.K., and McCarty, P.L. 'Isolation and characterization of a facultatively aerobic bacterium that reductively dehalogenates tetrachloroethene to cis-l ,2-dichloroethene', Appl. Environ. Microbiol., 62(3), pp. 761-765 (1996)
  •  
  • 13. Darnborsky, J., 'Tetrachloroethene-dehalogenating bactri', Folia Microbiol., 44(3), pp. 247-262 (1999)
  •  

This Article

  • 2004; 9(3): 49-55

    Published on Sep 1, 2004