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通过小试与中试相结合,考察了用小试混凝沉淀技术代替中试混凝超滤工艺判断混凝剂最佳投药量的可行性,对比研究了经聚合氯化铝(PAC)、FeCl3、硫酸铝(AS)3种混凝剂预处理超滤后在除浊、除有机物、膜污染控制等方面的效能。结果表明,浊度的去除效果与混凝剂的种类和投加量无关,有机物的去除效果由高到低为PAC(45.5%)>FeCl3(42.4%)>AS(35.5%),膜污染程度(ΔTMP)由高到低为AS(42.72kPa)>FeCl3(39.68 kPa)>PAC(21.01kPa),综合比较采用PAC混凝预处理效果最佳,对水厂实际运行具有一定指导意义。
Through the combination of pilot and pilot tests, the feasibility of determining the optimal dosage of coagulant by small pilot coagulation and sedimentation instead of pilot coagulation and ultrafiltration was investigated. The effects of PAC, FeCl3, aluminum sulfate (AS) three kinds of coagulant pretreatment after turbidity removal, in addition to organic matter, membrane pollution control efficiency. The results showed that turbidity removal efficiency was independent of coagulant type and dosage, and the removal efficiency of organic matter from high to low were PAC (45.5%)> FeCl3 (42.4%)> AS (35.5%), membrane fouling degree (ΔTMP) from high to low is AS (42.72kPa)> FeCl3 (39.68kPa)> PAC (21.01kPa). The comprehensive comparison shows that PAC coagulation pretreatment has the best effect, which is of guiding significance to the actual operation of the water plant.