陶瓷膜组合工艺对自来水厂排泥水的处理效果

EFFECT OF CERAMIC MEMBRANE COMBINED PROCESS IN TREATMENT OF SLUDGE WATER FROM DRINKING WATER TREATMENT PLANT

研究了陶瓷膜组合工艺对南方某自来水厂排泥水的净化处理效果,主要工艺单元包括混凝、臭氧氧化、超滤陶瓷膜与活性炭过滤,实现排泥水资源回收利用。采用规模为10 m^(3)/d中试装置,陶瓷膜通量为100 L/(m^(2)·h),跨膜压差TMP<30 kPa。考察了组合工艺对浊度、色度、有机物(COD_(Mn))、氨氮、土臭素(GSM)、二甲基三硫醚(DMTS)、2-甲基异莰醇(2-MIB)、药物和个人护理产品(PPCP_(s))和内分泌干扰物(EDC_(s))等污染物的去除效果。结果表明:经中试工艺处理后,出水指标均达到GB 5749—2006《生活饮用水卫生标准》。中试工艺对浊度、色度、COD_(Mn)和氨氮的平均去除率分别为99%、100%、75.9%和72.3%,对PPCP_(s)、EDC_(s)、DMTS和2-MIB的平均去除率分别为95.4%、78.3%、90.3%和100%,处理效果显著优于该自来水厂现有排泥水处理工艺。原位臭氧氧化还能够有效缓解膜污染。中试结果表明,臭氧/陶瓷膜和活性炭过滤组合工艺回收处理自来水厂排泥水在技术上稳定可行。

The combined processes based on ceramic membrane were studied including coagulation,ozonation,ceramic membrane ultrafiltration and activated carbon filtration,for sludge water reuse in a drinking water treatment plant(WTP)in South China.A pilot system with a capacity of 10 m^(3)/d was set up.Under membrane flux of 100 L/(m^(2)·h)and transmembrane pressure TMP of 30 kPa,the removal efficiencies of the pilot-scale test for turbidity,color,COD_(Mn),ammonia,geosmin(GSM),dimethyl trisulfide(DMTS),2-methylisocamphenol(2-MIB),pharmaceuticals and personal care products(PPCP_(s))and endocrine disruptors(EDC_(s))were evaluated.The results showed that the quality of the treated sludge water was able to totally meet the requirement of China National Standards for Drinking Water Quality(GB 5749—2006).The average removal efficiencies of turbidity,color,COD_(Mn),and ammonia were 99%,100%,75.9%,and 72.3%,respectively,and the average removal efficiencies of PPCP_(s),EDC_(s),DMTS and 2-MIB were 95.4%,78.3%,90.3%and 100%,respectively.The effluent quality of the pilot process was much better than that of the existing sludge water recovery processes in the WTP.Moreover,in situ ozonation in membrane tank could effectively alleviate the membrane fouling.The findings proved that the combined processes of ozonation/ceramic membrane filtration and activated carbon filtration was technically stable and feasible for the reuse of sludge water of water treatment plant.