厌氧条件下有机氯代烃污染物的氧化降解  

Oxidative Degradation of Chlorinated Hydrocarbons under Anaerobic Conditions

作　　者：卢晓霞[1] 李广贺[1] 张旭[1] 章卫华[1] 

机构地区：[1]清华大学环境科学与工程系,北京100084

出　　处：《环境科学》2002年第4期37-41,共5页Environmental Science

基　　金：国家重点基础研究专项经费资助项目(G19990 4 5 711);国家自然科学基金资助项目(49972 0 82 );中国博士后基金项目 (2 0 0 0 );回国留学人员启动基金项目 (2 0 0 1)

摘　　要：根据土柱实验 ,对 3种弱还原条件下氯乙烷和氯乙烯类化合物的氧化降解进行了研究 .结果显示 ,在硝酸盐和氧化锰存在条件下 ,1 ,2 二氯乙烷 (1 ,2 DCA)和一氯乙烯 (VC)可发生氧化降解 ,其中 ,1 ,2 DCA转化速率在反硝化和锰还原过程中分别为 1 1 8/h和 0 5 4/h ,VC转化速率分别为 0 2 9/h和 0 1 5 /h .在Fe(OH) 3存在条件下 ,VC无明显降解 ,1 ,2 DCA的降解亦受到抑制 .其它有机氯代烃 ,如 1 ,1 ,1 三氯乙烷、三氯乙烯、及二氯乙烯异构体等 ,在 3种氧化还原条件下均未发生降解 .氯苯尽管显示了较高的去除率 ,但由于其在土壤中的吸附潜力大 。Based on column experiments, the oxidative degradations of some chlorinated hydrocarbons under three less reduced redox conditions were investigated. The results showed that in the presence of nitrate and manganese oxide, 1,2 dechloroethane (1,2 DCA) and vinyl chloride (VC) could be oxidized. The transformation rates of 1,2 DCA under denitrification and manganese reduction were 1 18/h and 0 54/h, respectively, while those of VC were 0 29/h and 0 15/h, respectively. In the presence of iron, degradation of VC was not clear. In addition, the degradation of 1,2 DCA was inhibited. For other chlorinated hydrocarbons, such as 1,1,1 trichloroethane, trichloroethene, cis dichloroethene and trans dichloroethene, no degradation occurred under the three studied redox conditions. Monochlorobenzene exhibited relative high removal in the columns, however, due to its high soil adsorption potential, it was not known yet whether microbial activities were involved.

关 键 词：厌氧条件 有机氯代烃 污染物 氧化 降解 电子受体 转化速率 地下水 

分 类 号：X172[环境科学与工程—环境科学] X523