メタン発酵微生物を用いたバイオエレクトロによるPCEの還元的脱塩素に関する研究

抄録

Reductive dechlorination of tetrachloroethylene (PCE) was investigated in a bio-electro reactor system. It consisted of cathodic electrodes on which methane fermentative microorganisms were immobilized and anodic carbon electrodes. Methane fermentative microorganisms used in this study were cultured from a mixture of lake sediment and anaerobic treatment sludge as inoculum source. PCE dechlorination, supported either by hydrogen gas or by organic compounds fed as primary energy source and electron donor, was also investigated at 35°C in small vials used as bioreactors. In the bioelectro reactor system, hydrogen generated by electrolysis of water supports PCE dechlorination. PCE was transformed mainly into ethylene (ETH) and trans-1, 2-dichloroethylene (trans -DCE). On the other hand, when PCE dechlorination was supported by hydrogen gas or organic compounds, PCE was dechlorinated mainly up to cis-1, 2 dichloroethylene (cis-DCE) and vinyl chloride (VC) respectively. The fact that PCE was dechlorinated into harmless metabolites such as ETH in the bio-electro reactor system, suggested that such process investigated would be applied for PCE contaminated groundwater remediation.