苯为共代谢基质的1,1-二氯乙烯的好氧生物降解研究

Biodegradation of 1,1-dichloroethene using benzene as cometabolism substrate

为了更好地去除地下水中常见的共同存在且难降解的有机物苯与1,1-二氯乙烯(DCE),研究了从苯与DCE驯化的活性污泥中筛选获得的菌株DB-TS对苯与DCE的降解特性。当苯初始浓度相同时,随着DCE初始浓度的增加,苯的降解率不断减少;而DCE的去除率先增加后降低。苯的降解符合一级反应动力学;DCE的降解符合Monod动力学方程,饱和常数为3.756 mg/L,DCE的最大比降解速率为2.178 mg/(L.h)。

In order to find a more effective and economical way to remove benzene and 1,1-dichloroethene（DCE）,which were difficult to be remedied and commonly coexisting organic in groundwater,the degradation characteristics of benzene and DCE by strain DB-TS,screened from activated sludge tamed by benzene and DCE,were investigated in this study.When the initial benzene concentration maintained a certain value,the degradation rate of benzene reduced and the removal rate of DCE increased firstly and then inclined with increasing initial DCE concentration.The removal of benzene was in accordance with first-order reaction kinetics.Moreover,the degradation of DCE confirmed well with Monod equation： the saturation constant was 3.756 mg/L and the maximum specific degradation rate of DCE was 2.178 mg/（L·h）.