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http://dx.doi.org/10.4491/KSEE.2012.34.5.304

Biological Dechlorination of Chlorinated Ethylenes by Using Bioelectrochemical System  

Yu, Jaecheul (School of Civil and Environmental Engineering, Pusan National University)
Park, Younghyun (School of Civil and Environmental Engineering, Pusan National University)
Seon, Jiyun (School of Civil and Environmental Engineering, Pusan National University)
Hong, Seongsuk (School of Civil and Environmental Engineering, Pusan National University)
Cho, Sunja (School of Civil and Environmental Engineering, Pusan National University)
Lee, Taeho (School of Civil and Environmental Engineering, Pusan National University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.34, no.5, 2012 , pp. 304-311 More about this Journal
Abstract
Chlorinated ethylenes such as perchloroethylene (PCE) and trichloroethylene (TCE) are widely used as industrial solvents and degreasing agents. Because of improper handling, these highly toxic chlorinated ethylenes have been often detected from contaminated soils and groundwater. Biological PCE dechlorination activities were tested in bacterial cultures inoculated with 10 different environmental samples from sediments, sludges, soils, and groundwater. Of these, the sediment using culture (SE 2) was selected and used for establishing an efficient PCE dechlorinating enrichment culture since it showed the highest activity of dechlorination. The cathode chamber of bioelectrochemical system (BES) was inoculated with the enrichment culture and the system with a cathode polarized at -500 mV (Vs Ag/AgCl) was operated under fed-batch mode. PCE was dechlorinated to ethylene via TCE, cis-dichloroethylene, and vinyl chloride. Microbial community analysis with polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) showed that the microbial community in the enrichment culture was significantly changed during the bio-electrochemical PCE dechlorination in the BES. The communities of suspended-growth bacteria and attached-growth bacteria on the cathode surface are also quite different from each other, indicating that there were some differences in their mechanisms receiving electrons from electrode for PCE dechlorination. Further detailed research to investigate electron transfer mechanism would make the bioelctrochemical dechlorination technique greatly useful for bioremediation of soil and groundwater contaminated with chlorinated ethylenes.
Keywords
Bioelectrochemical System; Chlorinated Ethylene; Dechlorination; Microbial Community;
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