混凝-超滤处理受污染原水的试验研究

Study of coagulation-ultrafiltration process on contamination water

进行了混凝-超滤组合工艺对受污染原水的试验,研究了混凝改善膜通量和防止膜污染的效果.结果表明,投加混凝剂20 mg/L(以A l2(S04)3计)后对不同季节原水的膜通量影响差别较大,在常温20℃和在低温5℃时,混凝后在经过0.45μm膜过滤后的水样对膜通量的影响最大,通量分别下降了39.6%和48.3%.而混凝后直接过滤的水样对膜通量的影响最小,通量分别下降了14.5%和21.8%;在不同温度下,混凝后直接过滤的水样对UV254的去除率都是最高的,分别达到18.8%和42.3%,且在低温时对UV254的去除率最高,说明在低温下直接过滤混凝液更能有效的去除有机物.

The effect of coagulation-ultrafiltration process on the contamination water was tested.Discussed the effect of coagulation pretretment improve the membrane flux and prevent membrane fouling.The results showed that：when the dosage of coagulation was 20 mg/L,the different temperatures of the water samples had different result of the membrane flux.in the temperature of 20 ℃ and 5 ℃,after coagulation and 0.45 μm membrane filtration,the water samples had the biggest on membrane flux,there was 39.6% and 48.3% percent decline in flux.However,the sample water of the coagulation had the smallest impact on the membrane flux,there was 14.5% and 21.8% percent decline in flux.But in the different temperatures,the sample water after coagulation had the highest removal rate to UV254,the results reached 18.8% and 42.3%.At the low temperature 5℃,the removal rate was the higest.Therefore,in-line coagulation-UF process can improve the effect of water treatment under low temperature.