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Anaerobic Reductive Dechlorination of Tetrachloroethylene (PCE) in Two-in-series Semi-continuous Soil Columns  

Ahn, Young-Ho (School of Civil and Environmental Engineering, Yeungnam University)
Choi, Jeong-Dong (School of Civil and Environmental Engineering, Yeungnam University)
Kim, Young (Dept. of Environmental Engineering, Korea University)
Kwon, Soo-Youl (Dept. of Environmental Health, Korea National Open University)
Park, Hoo-Won (GreenTech Environmental Consulting Co. Ltd.)
Publication Information
Journal of Soil and Groundwater Environment / v.11, no.2, 2006 , pp. 68-76 More about this Journal
Abstract
Anaerobic reductive dechlorination of tetrachloroethylene (PCE) to ethylene was investigated by performing laboratory experiments using semi-continuous flow two-in-series soil columns. The columns were packed with soils obtained from TCE-contaminated site in Korea. Site ground water containing lactate (as electron donor and/or carbon source) and PCE was pumped into the soil columns. During the first operation with a period of 50 days, injected mass ratio of lactate and PCE was 620:1 and incomplete reductive dechlorination of PCE to cis-DCE was observed in the columns. However, complete dechlorination of PCE to ethylene was observed when the mass ratio increased to 5,050:1 in the second operation, suggesting that the electron donor might be limited during the first operation period. Dechlorination rate of PCE to cis-DCE was $0.62{\sim}1.94\;{\mu}mol$ PCE/L pore volume/d and $2.76\;{\mu}mol$ cis-DCE/ L pore volume/d for that for cis-DCE to ethylene, resulting that net dechlorination rate in the system was 1.43 umol PCE/L pore volume/d. During the degradation of cis-DCE to ethylene, the concentration of hydrogen in column groundwater was $22{\sim}29\;mM$ and $10{\sim}64\;mM$ for the degradation of PCE to cis-DCE. These positive results indicate that the TCE-contaminated groundwater investigated in this study could be remediated through in-situ biological anaerobic reductive dechlorination processes.
Keywords
Anaerobic reductive dechlorination; Biotransformation; Soil column reactor; Tetrachloroethylene;
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