含溴黄浦江水消毒过程中溴代三卤甲烷和卤乙酸的生成特性

Formation of Br-THMs and Br-HAAs in bromide-containing Huangpu river water during disinfection

通过水厂出水DBPs调查和氯化培养实验探讨了黄浦江水中溴离子(Br-)在消毒过程中的迁移及对含溴副产物(溴代三卤甲烷和卤乙酸)生成的影响.结果表明,采用氯胺消毒的水厂出水中约10%的Br-迁移至Br-THMs和Br-HAAs.氯化培养时,在余氯充足的前提下增加Br-浓度,总有机溴(TOBr)和含溴副产物均增加.延长氯化反应时间可促进Br--THMs的形成,但对Br-HAAs影响不大.氯胺消毒较自由氯消毒可有效减少TOBr,其中Br-THMs显著减小.pH由5.0增至9.0过程中,Br-THMs的形成由于碱催化反应得到增强,但由于HOBr/OBr-比例降低而减少了Br--HAAs的生成量.

Bromine incorporation characteristics and their effect on the formation of Br-DBPs（Br-THMs and Br-HAAs） in Huangpu River water were explored by investigations of DBPs and batch chlorination experiments of water plant effluent.Results showed that about 10% of the bromide ions in raw water were transferred into Br-THMs and Br-HAAs.During chlorination experiments,TOBr,Br-THMs and Br-HAAs were increased in the case of high bromide concentrations with excess residual chlorine.Br-THMs were increased along with lengthened chlorination reaction time,but Br-HAAs remained almost the same.Compared with free chlorine,chloramine disinfection can effectively reduce the production of TOBr,among which Br-THMs were reduced significantly.When pH increased from 5.0 to 9.0,Br-THM formation was enhanced due to the base-catalyzed reaction,but the ratio of HOBr/OBr was decreased and resulted in the reduction of Br-HAA formation.