臭氧/陶瓷膜集成工艺的饮用水安全性研究

Study on Drinking Water Safety of Integrated Process Combining Ozonation with Ceramic Membrane

从微生物安全和消毒副产物前体物控制两个方面对混凝、臭氧/陶瓷膜和生物活性炭集成工艺进行了中试研究。结果表明,膜出水中粒径>2μm的颗粒数低于10个/mL,大肠杆菌、菌落总数、隐孢子虫和贾第虫均为零,从而有效保障了工艺出水的微生物安全。臭氧投量为3mg/L时,中试工艺对UV254和DOC的去除率分别为83%和73%,对三卤甲烷、卤乙酸和三氯乙醛前体物的去除率分别为77%、76%和83%,其中对三氯甲烷、二氯乙酸和三氯乙酸前体物的去除率分别为81%、79%和77%。集成工艺能有效控制病原微生物和大幅降低水中消毒副产物前体物含量,显著改善饮用水的安全性。

A pilot-scale study was conducted to evaluate the microbiological safety and disinfection by-products precursors in the drinking water treated by the integrated process of coagulation, ozonation/ ceramic membrane filtration and biological activated carbon. The results showed that the number of parti- cles larger than 2 μm in the membrane effluent was less than 10 p/mL, and the coliform count, total bac- terial count, Cryptosporidium oosysts and Giardia cysts in the membrane effluent were all zero. Thus, all pathogens in raw water were retained by ceramic membrane and the microbiological safety of the integrat- ed process was guaranteed. The removal rates of UV2s4, dissolved organic carbon （DOC） , trihalometh- ane precursor, haloaeetie acid precursor, chloral precursor, trichloromethane precursor, dicholoroaeetic acid precursor and trichloroacetic acid precursor in the integrated process were 83%, 73%, 77%, 76% , 83% , 81% , 79% and 77% respectively with ozone dosage of 3 mg/L. The integrated process can effectively remove pathogens and organic pollutants like disinfection by-products orecursors, and sip-nificantly improve the drinking water safety.