摘要
以上海某水厂及其供水管网系统为研究对象,采用微生物学和物理化学分析方法研究了水厂常规净水工艺对主要指标的去除效果和管网水水质的生物稳定性及其变化规律。结果表明:与《地表水环境质量标准》中的水源地水质标准相比,水厂原水中硝酸盐氮、pH、总大肠菌群的合格率为100%,亚硝酸盐氮、氨氮的合格率仅有40%,总磷、DO、CODMn的合格率也较低,分别为0、40%、20%,在处理或供水过程中可能引起细菌的再生长;水厂的净水工艺对微生物和总磷的去除效果显著,对腐殖质等大分子有机物的去除效果也较好,但对DOC、BDOC的去除效果不明显;原水的SUVA值较小,不需进行强化混凝处理;BDOC和异养菌数沿管网上升,且异养菌数与浊度、BDOC、总磷呈正相关,与余氯呈负相关。
Taking a waterworks and its water supply system in Shanghai as research object, the remoral efficiency of main indexes in conventional purification process and the biostability of pipe network water were investigated by microbiological and physicochemical analysis methods. The results show that based on the Environmental Quality Standards for Surface Water, in the raw water, the up-to-standard rates of NO3^- -N, pH, total coliform are 100% , but the up-to-standard rates of NO2^- -N, NH3 -N, TP, DO and CODMn are only 40%, 40%, 0%, 40% and 20% respectively, which can cause bacterial regrowth in water treatment unit and water supply network. The purification process can remove microor- ganisms, total phosphorus and humic substance effectively, but th is not significant. SUVA in the raw water is low, and enhanced c e removal efficiency of DOC and BDOC oagulation is not necessary. BDOC and heterotrophic bacteria quantity increase along the water supply system. The heterotrophic bacteria quantity has a positive correlation with turbidity, BDOC and total phosphorus, and a negative correlation with residual chlorine.
出处
《中国给水排水》
CAS
CSCD
北大核心
2008年第11期64-67,共4页
China Water & Wastewater
基金
国家自然科学基金资助项目(50408012)
关键词
给水处理
供水系统
生物稳定性
细菌再生长
强化混凝
water treatment
water distribution system
biostability
bacterial regrowth
enhanced coagulation
