聚合氯化铝-聚丙烯酰胺复合絮凝剂的特性及絮凝作用

摘要

Inorganic and organic composite polymer flocculant polyaluminium chloride-polyacrylamide(PAC-PAM) was prepared in this research.Optimum turbidity removal,below 4.0NTU,was achieved with 8mg·L-1 dosage (calculated as Al3+) under raw pH.In this paper studies on flocculating mechanism of composite flocculant were also conducted through comparisons of zeta potential,morphology before and after treatment,the particle size distribution of different flocculants.The results show that hydrolysate of composite flocculant has more positive charges and a structure of branch long chain which enhanced the effect of electrical neutralization and adsorption bridging.%制备了无机和有机高分子复合絮凝剂聚合氯化铝-聚丙烯酰胺(PAC-PAM),在不调节pH值、投加量为8mg·L-1(以Al3+计)的条件下,絮凝剂净化长江水的效果最佳,余浊达到4.0NTU以下.通过测定絮凝剂的Zeta电位、观察絮凝剂形貌和处理长江水所形成絮体的形貌、分析絮体的粒度分布,对聚合氯化铝和聚合氯化铝-聚丙烯酰胺进行了比较研究,探讨了复合絮凝剂的絮凝机理.结果发现:聚合氯化铝与聚丙烯酰胺复合后,水解产物带有更多正电荷并具分枝状长链结构,增强了电中和及吸附架桥的作用.