PDMDAAC在海水混凝过程中的助凝作用

将PAC与PDMDAAC协同使用处理近岸海水,考察其对海水中污染物的混凝效能,监测絮体厚度的变化过程,并分析稳定动力学规律。结果表明,与单独投加PAC相比,PAC与PDMDAAC协同作用下的絮凝效果较好,对海水中浊度和磷酸盐的去除率可分别提高22.3%、22.0%,生成的絮体厚度较大,絮凝持续时间较短,说明PDMDAAC有显著的助凝作用。从体系稳定性角度分析絮凝机理,投加PDMDAAC的海水体系具有较大的稳定动力学参数,使海水更易脱稳。

Coagulation aid function of PDMDAAC in the process of seawater coagulation

PAC and PDMDAAC have been used synergistically for treating seawater from nearshore. The coagula-tion effect of flocculants on the pollutants in seawater is investigated ,the changing process of the thickness of the flocs is monitored,and the rule of stability kinetics is analyzed. The results show that compared with using PAC singly,using PAC and PDMDAAC synergistically has better flocculation effect. The removing rates of turbidity and phosphate are increased by 22.3%and 22.0%. The thickness of the generated flocs is higher and the duration of floc-culation is shorter. It indicates that PDMDAAC has obvious flocculation aid function. In addition ,the mechanism of flocculation is analyzed at an angle of system stability. Seawater system added with PDMDAAC has large stability kinetics parameters,so that the seawater is apt to be destabilized.