聚(丙烯酰胺-二甲基二烯丙基氯化铵)-聚硅酸锌复合絮凝剂的制备及其絮凝性能

Preparation and flocculation performance of poly( acrylamide-dimethyldiallylammonium chloride)-zinc polysilicate composite flocculant

利用水溶液聚合法制备PDA-聚硅酸锌复合絮凝剂,并用丙烯酰胺-二甲基二烯丙基氯化铵(poly(acrylamide-dimethyldiallylammonium chloride),PDA)和复合絮凝剂分别处理刚果红模拟染料废水和高岭土模拟废水,再分别通过扫描电镜做出对比.结果表明:在处理刚果红模拟染料废水时,复合絮凝剂在p H=8时得到的效果最好,脱色率为90.4%,较单独使用PDA高9.1%;在处理高岭土模拟废水中,最佳投加量为1.8 m L.在p H=8时,复合絮凝剂的去浊率为99.5%,较单独使用PDA高16.9%.通过扫描电镜发现,复合絮凝剂较二者未复合前,其比表面积更大,有利于对废水的絮凝.

The poly （acrylamide-dimethyldiallylammonium chloride） （PDA） -zinc polysilicate compos- ite flocculant was prepared by aqueous solution polymerization method and the Congo red mock dye wastewater and kaolin simulated wastewater were treated by PDA and compound flocculant, respectively. Then scanning electron microscope was used to compare with PDA and compound flocculant respectively. The results showed that the composite flocculant had the best effect at pH = 8, and the decolorization rate was 90.4% in dealing analog Congo red mock dye wastewater, which was 9. 1% higher than using PDA alone. The best optimum dosage was 1.8 mL in the treatment of kaolin simulated wastewater. The remov- al of turbidity of the flocculant was 99.5% at pH = 8, which was 16.9% higher than using PDA alone. Finally, the complex flocculantby had more larger surface than the single bye the scanning electron mi- croscopy, and this flocculant was more suitable for the flocculation of wastewater. Thus, in this experi- ment, the composite flocculant had a better performance than the PDA.