Degradation of TCE by autotrophic hydrogen-bacteria combined zero-valent iron in soil columns under continuous addition of H2 gas via membranes conditions

• Main Authors: Chia-Ling Chiang, 江家菱
• Other Authors: 曾四恭
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/75660123461476322649

碩士 === 國立臺灣大學 === 環境工程學研究所 === 95 === Chlorinated organic compounds, such as trichloroethene（TCE）, have been widely used as industrial solvents. They are completely synthetic organic compounds having carcinogen property and are known to cause damage to the human liver and kidney. Their releases into subsurface environments result in contamination of the soil and groundwater. Column experiments were performed to simulate a aquifers contaminated with TCE in situ. The technology involves installation of hollow fiber membranes to supply hydrogen gas （H2 ）as an electron donor. Three laboratory-scale columns were carried out by using combined zero-valent iron with autotrophic hydrogen-bacteria and compared with individual systems . The results show that hydrogen provided promote biological dechlorination in the individually biological and zero-valent iron combined with autotrophic hydrogen-bacteria system, TCE was dechlorinated to methane completely with no chlorinated intermediates were detected. In the zero-valent iron system, supplying of hydrogen gas increased dechlorination rate and suppressing the ionization of zero-valent iron and also can increase the rate of transform acetylene into ethene or ethane. Dechlorination rate of TCE by combined zero-valent iron with autotrophic hydrogen-bacteria was higher than individual systems. These findings suggest that the combined system is effective practical treatment of TCE and chlorinated ethylenes in contaminated sites.