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目的研究不同铝盐混凝剂对不同原水水质的混凝效果,并对其结果进行比较。方法取宝鸡渭河原水、清姜河原水为水样,以PAC和PAFC为混凝剂,分别进行最佳投加量和最佳pH的单因素混凝实验,选用混凝效果较好的PAFC进行正交实验,分析混凝后水样浊度与UV254。结果渭河原水中,PAC最佳投加量为4~8mL,PAFC最佳投加量为4~6mL,PAC的最佳pH值为6~8,PAFC的最佳pH值为5~8;在清姜河原水中,PAC的最佳投加量为2~8mL,PAFC的最佳投加量为2~6mL,PAC,PAFC的最佳pH值均为6~8。结论渭河原水浊度与UV254较高,混凝剂投加量比pH值更能影响高浊度原水的混凝效果;清姜河原水浊度与UV254较低,pH值比混凝剂投加量更能影响低浊度原水的混凝效果。PAFC混凝效果的影响因素依次为:搅拌时间、PAFC投加量、pH值;PAFC的混凝最佳操作条件为:PAFC的投加量为6mL,pH值为6,快速搅拌时间为60s。
Objective To study the coagulation effect of different aluminum salt coagulants on different raw water quality and to compare the results. Methods The raw water of Weihe River in Baoji River and the raw water of Qingjiang River were taken as water samples. One-factor experiments of coagulation with PAC and PAFC as the best dosage and the best pH respectively were carried out. The PAFC with better coagulation effect Orthogonal experiments were conducted to analyze the water turbidity and UV254 after coagulation. Results The optimum dosage of PAC was 4 ~ 8mL, the best dosage of PAFC was 4 ~ 6mL, the optimum pH value of PAC was 6 ~ 8, and the optimum pH of PAFC was 5 ~ 8. The best dosage of PAC was 2 ~ 8mL, the best dosage of PAFC was 2 ~ 6mL, the optimum pH value of PAC and PAFC was 6 ~ 8. Conclusions The turbidity and UV254 of Weihe raw water are higher than that of the coagulant. The coagulant dosage can affect the coagulation effect of high turbidity raw water more than the pH value. The amount of more able to affect the low turbidity of raw water coagulation effect. The influencing factors of the coagulation effect of PAFC are as follows: stirring time, dosage of PAFC and pH value. The optimal operating conditions for PAFC coagulation are as follows: dosage of PAFC is 6mL, pH value is 6, and stirring speed is 60s.