Anaerobic Dechlorination of Perchloroethylene(PCE) in Soil by a Dechlorinating Microbial Consortium
スポンサーリンク
概要
- 論文の詳細を見る
An anaerobic dechlorinating microbial granular consortium was developed for biotreatment of soil contaminated with perchloroethylene(PCE) and trichloroethylene(TCE). Microcosm tests were conducted at ambient temperature(22℃)to examine the performance of PCE dechlorination by this consortium. TCE, dichloroethylene(DCE), and vinyl chloride(VC) were transiently observed as intermediates. Ethylene was the end product of PCE dechlorination. After four months' incubation with the consortium, ethane was observed as a product from reduction of ethylene in microcosms spiked with a low level of PCE(10 mg/kg soil) but not in those with a high PCE level(200 mg/kg soil). At the end of five months, more than 90% of the PCE added to the soil was accounted for , on a molar basis, as ethylene and ethane. The dechlorination was predominately supported by soil organic matter. The dechlorination performance of the consortium was not inhibited whether the soil was spiked with 10 or 200 mg PCE/kg dry soil. The inoculum level influenced the initial dechlorination process, but there was no significant difference in the extent of dechlorination after three months at a low or high level of inoculum(3 or 60 mg VSS/kg soil). Partial and slow dechlorination was also observed in controls without added inoculum deu to activity of indigenous soil organisms. In the controls, TCE, cis-1, 2-DCE, and VC ware accumulated as intermediates. No dechlorination occurred in soil that was autoclaved and did not receive microbial granules. Methanogenesis was inhibited in the presence of the high initial PCE level(200 mg/kg soil)but not at the low level(10 mg/kg soil).
- 公益社団法人日本生物工学会の論文
- 1998-12-25
著者
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Jain Mahendra
Mbi International
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WU WEIMIN
MBI International
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KITAGAWA MASAYOSHI
Ebara Research Co.Ltd.
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TANIGUCHI SHIN
Ebara Research Co.Ltd.