In this study, a natural polymer-based organic flocculant (sodium alginate-methacrylatoethyl trimethyl ammonium chloride, SA-PDMC) was synthesized by graft copolymerization. The optimum preparation procedures were determined by single factor experiments. The flocculation behaviors of SA-PDMC were investigated in humic acid (HA) and kaolin suspension considering the effects of flocculant doses and initial pH. The results indicated that charge neutralization and bridging action played an important role in the removals of HA and kaolin. Also, SA-PDMC performed well in a wide pH range of 5.0−10.0. Besides, SA-PDMC, as polyaluminium (PAC) aid, was investigated in the lake water treatment. The ratio of PAC and SA-PDMC was optimized through response surface methodology based on a central composite design. Results showed that SA-PDMC and PAC have a strong synergy, under optimal conditions SA-PDMC can reduce the dose of PAC by 40 % while ensuring the water quality.

在这项研究中，通过接枝共聚合成了一种基于天然聚合物的有机絮凝剂（海藻酸钠-甲基丙烯酰基乙基三甲基氯化铵，SA-PDMC）。最佳制备步骤通过单因素实验确定。考虑絮凝剂剂量和初始pH的影响，研究了SA-PDMC在腐殖酸（HA）和高岭土悬浮液中的絮凝行为。结果表明，电荷中和和桥联作用在HA和高岭土的去除中起重要作用。同样，SA-PDMC在5.0-10.0的宽pH范围内表现良好。此外，在湖水处理中还研究了SA-PDMC作为聚铝（PAC）的辅助材料。通过基于中心复合设计的响应面方法优化了PAC和SA-PDMC的比例。