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四氯乙烯在不同地下水环境的生物共代谢降解

李烨, 潘涛, 刘菲, 李森, 郭淼

李烨, 潘涛, 刘菲, 李森, 郭淼. 四氯乙烯在不同地下水环境的生物共代谢降解[J]. 岩矿测试, 2012, 31(4): 682-688.
引用本文: 李烨, 潘涛, 刘菲, 李森, 郭淼. 四氯乙烯在不同地下水环境的生物共代谢降解[J]. 岩矿测试, 2012, 31(4): 682-688.
LI Ye, PAN Tao, LIU Fei, LI Sen, GUO Miao. Co-metabolism Biodegradation of Tetrachloroethylene under Different Groundwater Conditions[J]. Rock and Mineral Analysis, 2012, 31(4): 682-688.
Citation: LI Ye, PAN Tao, LIU Fei, LI Sen, GUO Miao. Co-metabolism Biodegradation of Tetrachloroethylene under Different Groundwater Conditions[J]. Rock and Mineral Analysis, 2012, 31(4): 682-688.

四氯乙烯在不同地下水环境的生物共代谢降解

基金项目: 

住房和城乡建设部水体污染控制与治理科技重大专项"地下水源城市饮用水安全保障共性技术研究与示范"课题(2009ZX07424-002)

Co-metabolism Biodegradation of Tetrachloroethylene under Different Groundwater Conditions

  • 摘要: 四氯乙烯是地下水中常见的污染物,采用生物方法进行处理的优点是可以实现无害化、无二次污染、处理成本低。四氯乙烯只能在厌氧条件下发生还原脱氯,目前对产甲烷环境下四氯乙烯的降解研究较多,而对较弱还原环境,如反硝化、铁锰还原和硫酸盐还原环境下四氯乙烯的脱氯行为研究甚少。本文采用批实验,研究了在不同地下水环境,包括反硝化、铁还原、硫酸盐还原、混合电子受体和天然地下水环境下四氯乙烯的脱氯性能。结果表明,铁还原环境的四氯乙烯脱氯效果最好,天然地下水环境次之,四氯乙烯的去除率分别达到91.34%和84.71%,四氯乙烯很快转化为三氯乙烯,并可以进一步转化为二氯乙烯,四氯乙烯的降解符合准一级反应动力学方程。在反硝化、硫酸盐还原、混合电子受体环境,四氯乙烯的去除以挥发为主,降解只占很小的比例,且最终的降解产物只有三氯乙烯。地下水中三价铁的存在,对于四氯乙烯脱氯起促进作用;而当地下水中硝酸盐和硫酸盐的浓度较高时,四氯乙烯脱氯受到抑制。
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  • 收稿日期:  2012-03-01

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