日本地球惑星科学連合2018年大会

講演情報

[EE] ポスター発表

セッション記号 A (大気水圏科学) » A-GE 地質環境・土壌環境

[A-GE30] エネルギ・環境・水ネクサスと持続的発展

2018年5月21日(月) 15:30 〜 17:00 ポスター会場 (幕張メッセ国際展示場 7ホール)

コンビーナ:張 銘(産業技術総合研究所地質調査総合センター地圏資源環境研究部門)、川本 健(埼玉大学大学院理工学研究科)、薛 強(中国科学院武漢岩土力学研究所、共同)、Jet-Chau Wen(National Yunlin University)

[AGE30-P03] Biodegradation of Chlorinated Ethenes

*張 銘1吉川 美穂1 (1.産業技術総合研究所地質調査総合センター地圏資源環境研究部門)

キーワード:微生物分解、クロロエチレン類、分解経路、分解速度

Chlorinated ethenes, such as tetrachloroethene (PCE) and trichloroethene (TCE), have been widely used as solvents for dry cleaning and degreasing and many other applications. Extensive use and inadequate disposal of chlorinated ethenes have led to prevalent groundwater contamination worldwide, especially in industrially developed countries, like Japan. The occurrence of the lesser chlorinated ethenes, such as cis-1,2-dichloroethene (cis-DCE) and vinyl chloride (VC) in groundwater is primarily a consequence of incomplete anaerobic reductive dechlorination of PCE and/or TCE.

VC is more toxic and is known to be a human carcinogen. It has recently been specified as a new substance for regulation by the Soil Contamination Countermeasures Act in Japan.

To obtain the information that facilitates better understanding of the origin and prediction of the fate of VC at contaminated sites, this presentation summarizes the biodegradation mechanisms, potential biodegradation pathways, degrading microorganisms, and biological degradation rates under natural and enhanced conditions based on extensive literature survey. In addition, theoretical solutions for analyzing up to four steps consecutive reactions are derived. The solutions can be used to simulate complete anaerobic biodegradation of PCE to non-toxic ethene (ETH) through TCE, cis-DCE and VC.