摘要
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。
Purposes—To study the coagulation effect of different aluminum-based coagulants on the quality of different raw water and compare the results.Methods—With PAC and PAFC as coagulants,Optimal dosage and the optimal univariate coagulation test of pH were conducted respectively on the raw water,as the samples,from the Weihe River in the section of Baoji and the Qingjiang River.The best coagulation effect of PAFC is selected to analyze the water samples' turbidity and UV254 by orthogonal experiment.Results—In the water sample from the Weihe River,optimal dosage of PAC is 4~8mL and that of PAFC is 4~6mL,optimum pH of PAC is 6~8and that of PAFC is 5~8;In the water sample from the Qingjiang River,optimal dosage of PAC is 2~8 mL and that of PAFC is 2~6mL and that of PAC and PAFC is 6~8.Conclusions—The turbidity and UV254 of the raw water from the Weihe River are higher,the coagulation effect of high turbidity water can be affected more obviously by coagulant dosage than pH value.The turbidity and UV254 of the raw water from the Qingjiang River are lower,the coagulation effect of low turbidity water can be affected more obviously by pH value than coagulant dosage.The influence factors of PAFC coagulation effect are mixing time,PAFC dosage and pH value,in that order.The optimum operating conditions of PAFC coagulation is that PAFC dosage is 6mL,pH value 6and fast mixing time 60 s.
出处
《宝鸡文理学院学报（自然科学版）》
CAS
2016年第2期53-57,共5页
Journal of Baoji University of Arts and Sciences(Natural Science Edition)
基金
陕西省教育厅自然科学项目(15JK1026)
陕西省灾害监测与机理模拟重点实验室项目(12JS011)
宝鸡市自然科学基金项目(2013R7-2)
陕西省地理学重点学科资助
