长距离输水管网中DBPs生成分布规律及管网微生物的多样性

摘要

Distribution rule of disinfection by-products (DBPs) in long-distance water delivery pipelines as well as microbial diversity are investigated.It has been found that trihalomethane(THMs) is increased along with the extension of hydraulic retention time (HRT) and then to be stable,which reaches its maximum of 51.18 μg/L in 24 h.Haloacetic acids(HAAs) increases at first,then decreases along with time,which reaches 13.94 μg/L in 24 h and decreases to 5.88 μg/L in 60 h.Booster chlorination causes DBPs increase again.THMs and HAAs in terminal water increase 35％ and 30％,compared to no booster chlorination.Booster chlorination changes composition of DBPs as well.Moreover,water in the pipe and on the inert wall of the pipe presents a high microbial diversity.Dominant phylum in output water and pipe water has a certain similarity and biofilm is slightly different,mainly dominated by Firmicutes in all samples.%研究长距离输水管网中消毒副产物的生成分布规律及管网中微生物多样性情况.结果表明:三卤甲烷量随水力停留时间延长先增加后趋于稳定,24 h时达到最大,为51.18 μg/L;卤乙酸量随HRT延长先增加后减少,24 h时生成量最大,为13.94 μg/L,60 h时减少至5.88 μg/L;二次加氯会造成水中DBPs的二次增加,末梢水THMs及HAAs较不加氯分别增加了35％及30％,并改变了DBPs组成结构;当地管网水及管壁生物膜具有较高的细菌多样性,且出厂水、管网水中的优势菌门是相同的,管壁生物膜稍有不同,但都以厚壁菌门为主.