不同基质共代谢降解地下水中四氯乙烯的研究

文中以甲醇、乙醇、甲酸盐、乙酸盐、乳酸盐和葡萄糖作为共代谢基质,利用某污水处理厂厌氧池中的污水(泥)作为接种物,对厌氧微生物进行培养和驯化,降解四氯乙烯(PCE)。实验结果表明,在厌氧污水(泥)和土壤混合环境下培养的微生物,以COD为培养指标,11d可培养成熟。6种基质均能使PCE还原脱氯降解成三氯乙烯(TCE)和1,1-二氯乙烯(1,1-DCE),PCE的降解均符合一级反应动力学方程,反应速率常数大小依次为K乙酸盐>K葡萄糖>K乳酸盐>K乙醇>K甲酸盐>K甲醇,其中乙酸盐是最有效的共代谢基质,其反应速率常数为0·6632d-1。

Degradation of tetrachloroethene by several co-metabolism substrates in groundwater

By inoculating sludge from an anaerobic pool, a tetrachloroethene(PCE) biodegradation test has been conducted in the anaerobic condition. The test shows that several co-metabolism substrates including methanol, ethanol, formate, acetate, lactate and glucose, are conducive to the conversion from PCE to TCE and 1,1-DCE. The results show that microbes can well be cultured in anaerobic environment of mixture of sewage (sludge) and soil with the index of COD within eleven days. The degradation of PCE is in accordant with the first order kinetic equation. The order of the reaction rate constants is K_acetate >K_glucose >K_lactate >K_ethanol >K_formate >K_methanol, and acetate is an outstanding co-metabolism substrate whose reaction rate constant is 0.663 2 d~-1.