Efficient Dechlorination of Tetrachloroethylene in Soil Slurry by Combined Use of an Anaerobic Desulfitobacterium sp.Strain Y-51 and Zero-Valent Iron

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A laboratory test was conducted to examine the combined effect of bioaugmentation of an anaerobic bacterial Desulfitobacterium sp. strain Y-51 and addition of zero-valent iron (Fe^0) on the reductive dechlorination of tetrachloroethylene (PCE) in a non-sterile soil slurry. Introduction of a strain Y-51 culture in soil (3 mg vss(volatile suspended solids)/kg soil) containing PCE (at 60 μmol/kg soil)led to complete conversion of PCE to cis-1, 2-dichloroethylene (cis-DCE) within 40 d. Treatments of the same soil slurry with Fe^0(0.1-1.0%) resulted in extended PCE dechlorination to ethylene (ETH) and ethane (ETA). The combined use of a strain Y-51 culture and Fe^0 showed effective dechlorination of PCE than did the individual use. The cis-DCE produced from biological PCE dechlorination by strain Y-51 was totally converted to non-chlorinated end products by the following chemical reduction by Fe^0. Furthermore, anaerobic corrosion of Fe^0 was found to stimulate the biological reductive dechlorination of PCE by keeping proper levels of pH and oxidation-reduction potential (ORP) and by producing cathodic hydrogen, which might be used as an electron donor for respiratory PCE dechlorination. These findings suggest that the combined use of bacterial strain Y-51 and Fe^0 is effective for practical treatment of PCE and other chlorinated ethylenes in contaminated sites.
社団法人日本生物工学会の論文
2001-11-25