[目的]探讨超滤膜与PAC混凝两种方法对低浊度的去除效果.[方法]试验原水均为自行配制,模拟低浊度微污染水源水浊度范围.设3种浊度(5、10、1SNTU)的原水,选用超滤与聚合氯化铝混凝两种方法,分别对3种低浊度进行处理效果的试验.[结果]无论进水浊度多少,超滤膜出水浊度均在1NTU以下,出水浊度稳定；PAC去除高岭土浊度的最佳pH为8左右,即中性和弱碱性条件PAC混凝效果最好；处理浊度为5NTU的原水的最佳投药量为7.5 mg/L;原水浊度为10和15NTU时,原水的最佳投加量分别为10和15 mg/L,去除率分别这74.2％和超过80％.[结论]建议使用混凝—超滤组合工艺,既避免了高浊度对膜组件的污染,减少膜污染速率,又保证了出水水质.%[Objective] The study aimed to discuss the removal effect on the low turbidity by 2 methods of ultrafiltration membranes and coagulation. [ Method] The experimental raw water was made by oneself to simulate the low turbidity in the micro-pollution source water turbidity range. The raw water with 3 turbidity of 5, 10, 15 NTU was set up and 2 methods of ultrafiltration membranes and poly-aluminum chloride ( PAC ) coagulation were selected to conduct the test of the treating effects on 3 low turbidity resp. [ Result] No matter how much water turbidity was, the effluent turbidity by the ultrafiltration membrane was below 1 NTU and was stable. When PAC was used to remove the kaolin turbidity , the best pH value was around 8, that is PAC coagulation could get best effect under the neutral and weak alkali conditions. When the turbidity of raw water was 5 NTU, the optimal dosage of PAC was 7.5 mg/L; when the turbidity of raw water was10 and 15 NTU, the optimal dosage was 10 and 15 mg/L, with the removal rate of 74.2% and over 80% , resp. [ Conclusion] It was suggested to use the coagulation-ul-trafiltration combination process, which ether could avoid the pollution of high turbidity on the membrane components and reduce the pollution membrane pollution rate, but also could guarantee the outlet water quality.
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