饮用水中典型微生物消毒过程中消毒副产物的生成规律  

Formation of major disinfection by-products from representative microorganisms during drinking water chlorination

作　　者：李林林[1] 刘佳蒙[1] 宋弼尧 孙兴滨[1] LIU Jia-meng;SUN Xing-bin;SONG Bi-yao;LI Lin-lin(School of Forestry, Northeast Forestry University, Harbin 150040, China)

机构地区：[1]东北林业大学林学院,黑龙江哈尔滨150040

出　　处：《中国环境科学》2016年第12期3631-3638,共8页China Environmental Science

基　　金：黑龙江省自然科学基金项目(E200812);中国博士后基金特别资助项目(200902408)

摘　　要：以饮用水中典型微生物——大肠杆菌(Escherichia coli)为试验对象,研究p H值、氯化时间、氯投量及细菌浓度对大肠杆菌在氯化消毒过程中生成消毒副产物(DBPs)的影响,并分析何种氯化条件下,DBPs控制效果最佳.研究表明:随氯投量增加,二氯乙腈(DCAN)呈先上升后下降趋势;随氯化时间延长,三氯丙酮(1,1,1-TCP)和DCAN先增加后减少;在p H值从5升高到9时,1,1,1-DCP、三氯硝基甲烷(TCNM)、二氯乙酸(DCAA)和三氯乙酸(TCAA)持续降低;细菌污染水源事件在近年常有报道,当水源水中细菌浓度增加时,饮用水中三氯甲烷(TCM)、TCNM、DCAA和TCAA浓度增加,但DCAN、三氯乙腈(TCAN)、二氯丙酮(1,1-DCP)和1,1,1-TCP不一定增加.为了达到低毒性的目的,氯投量浓度不宜太高,同时控制氯化时间为6h和p H>8.Formation of disinfection by-products(DBPs)from chlorination of Escherichia coli,a bacterial strain whichwas commonly found in drinking water as a representative of aquatic microorganism,was investigated under selectedconditions.Evaluated factors included contact time,chlorine dosages,pH and bacterial concentrations.These factorspotentially influence the DBPs formation in the disinfection systems,which could be optimized for minimization of DBPsformation during chlorination of drinking water.Results showed that the formation of DCAN from the bacterialsuspension initially increased and then decreased with increased chlorine dose.The formation of1,1,1-TCP and DCANfollowed a similar pattern of increase and then decrease with prolonged reaction time.At the same time,theconcentrations of DCAA,TCAA,TCNM and1,1,1-DCP decreased when pH was increased from5to9.Bacterialcontamination in aquatic environments has been extensively reported in recent years.Increased bacterial concentration inthe raw water may lead to a higher formation of TCM,TCNM,DCAA and TCAA,but not for DCAN,TCAN,1,1-DCPand1,1,1-TCP.To achieve a low toxicity in drinking water,it is suggested from this study that chlorine concentrationshould be kept low,under disinfection contact time of6h and alkaline condition(pH>8).

关 键 词：大肠杆菌 氯化消毒 消毒副产物 

分 类 号：X703[环境科学与工程—环境工程]