甲醇为共代谢基质时四氯乙烯的厌氧生物降解  

Anaerobic Biodegradation of Tetrachlorothylene with Methanol as Co-metabolism Substrate

作　　者：李惠娣[1] 杨琦[1] 尚海涛[1] 

机构地区：[1]中国地质大学水资源与环境学院,北京100083

出　　处：《环境科学》2004年第3期84-88,共5页Environmental Science

基　　金：国家自然科学基金资助项目 ( 4 0 10 2 0 2 7)

摘　　要：四氯乙烯 (PCE)在厌氧条件下通过还原脱氯发生生物降解 .本文研究以甲醇作为共代谢基质时PCE的降解情况 .结果表明 :在微生物的作用下PCE还原脱氯为TCE和DCEs,可能有VC和乙烯 .因此 ,DCEs、VC和乙烯可能是PCE降解的终产物 .PCE、TCE的降解和TCE的生成都符合准一级动力学 .PCE和TCE的反应速率常数K分别为 0 8991d-1和 0 0 6 8d-1;半衰期分别为 0 77d和 10 19d ,TCE的生成速率常数为 0 1333d-1.表明PCE的脱氯速度大于TCE ,而TCE的生成速率大于降解速率 ,所以在整个实验期间都有TCE存在 .Tetrachloroethylene (PCE) is biodegraded by reductive dechlorination in anaerobic condition. PCE degradation by methanol as co\|metabolism substrate was studied. Results show that PCE was dechlorinated reductively to DCEs and TCE, probable VC and ethene. DCEs,VC and ethene are probably end products. It also shows that PCE, TCE degradation and TCE production fit in first order kinetics. Reaction rate constants for PCE and TCE were 0.8991d -1 and 0.068d -1 respectively. Half-live were 0.77d and 10.19d respectively. TCE production rate constant was 0.1333d -1. Rate constants show that PCE is degraded more rapidly than TCE. Production rate of TCE is higher than degradation rate of TCE, so TCE exists through the experiment.

关 键 词：共代谢基质 四氯乙烯 厌氧条件 生物降解 

分 类 号：X783[环境科学与工程—环境工程]