改性聚合氯化铝絮凝剂的制备及性能研究

以结晶AlCl3为原料制备聚合氯化铝(PAC),用聚硅酸对其进行改性,获得了改性的聚硅酸氯化铝絮凝剂。考察了pH值、SiO2浓度、温度、Al/Si摩尔比等因素对改性聚硅酸氯化铝制备的影响。结果表明,最佳制备条件为:pH值5~6,SiO2浓度2.5%,温度20~30℃,Al/Si摩尔比1.0。用改性聚硅酸氯化铝絮凝剂处理含油废水,其最佳的处理条件为:投加量125 mg/L,pH值8,搅拌时间20 min,搅拌温度50℃。改性聚硅酸氯化铝絮凝剂具有更好的除油、去除COD的效果。

Study on preparation and properties of the modified PAC flocculate

PAC flocculate was prepared by the crystal AlCl3 as raw material,then modified with polysilicic acid.The effect of pH value,concentration of SiO2,temperature,mole ratio of Al/Si was discussed.The result showed that pH=5～6,the concentration of SiO2=2.5%,temperature is 20～30 ℃,Al/Si=1.0.Wastewater treatment by modified polysilicic aluminum chloride.The optimum operational parameters are found that dosage is 125 mg/L,pH=8,stiring time is 20 min,sitring temperature is 50 ℃.The experiment for application shows that modified PAC has better flocculation efficiency of oil removing,remove COD than PAC.