2005 Fiscal Year Final Research Report Summary
Development of complete degradation of tetrachloroethylene by hybrid methods of anaerobic and aerobic processes
| Project/Area Number |
16380218
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Boundary agriculture
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| Research Institution | The University of Tokyo |
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Principal Investigator |
YAGI Osami The University of Tokyo, Graduate School of Engineering, Professor, 大学院・工学系研究科, 教授 (40132865)
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| Co-Investigator(Kenkyū-buntansha) |
KURISU Futoshi The University of Tokyo, Graduate School of Engineering, Assistant Professor, 大学院・工学系研究科, 講師 (30312979)
IWASAKI Kazuhiro National Institute for Environmental Studies, Chief Researcher, 分子生態影響評価研究チーム, 主任研究員 (30193717)
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| Project Period (FY) |
2004 – 2005
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| Keywords | tetrachloroethylene / torichloroethylene / anaerobic degradation / aerobic degradation / bioremediation / Methylocystis sp. M / ground water pollution / soil pollution |
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| Research Abstract |
The purpose of this research is to establish complete degradation of teterachloroethylene(PCE) by combining anaerobic and aerobic degradation process.
At first, effect of organic acids as electron donors on PCE dechlorination was studied in soil environment. Organic acids enhanced the PCE degradation and hydrogen was generated as metabolic products from these organic acids. Effect of hydrogen concentration on PCE degradation was investigated in soil environment. It is suggested high hydrogen concentration inhibited the complete dechlorination of PCE.
The low hydrogen concentration is favorable to complete dechlorination od PCE. To control hydrogen is very important for PCE dechlorination. At anaerobic condition, cis-dichloroethylene(cis-DCE) was accumulated in soil environment. Methane oxidizing bacterium Methylocystis sp. strain M shows high degradation activity foe DCE. Dichloroacetic acid was determined as a metabolite of DCE by Metylocystis sp, strain M. Aerobic DCE degradation pathways by Methylocystis sp. strain M were proposed. It seems that combined systems of anaerobic and aerobic systems is was effective to complete degradation of PCE.
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