聚氯化铝-聚二甲基二烯丙基氯化铵复合絮凝剂混凝行为和絮体特性对混凝-超滤工艺水处理效能和膜污染影响

本课题拟采用不同碱化度的（B）聚合氯化铝（PACl）分别与不同粘度的二甲基二烯丙基氯化铵（PDMDAAC）按不同比例复合制备出系列新型PACl—PDMDAAC无机-有机复合混凝剂；以模拟水和实际地表水为处理对象，通过混凝试验，优选出不同B值的PACl与不同粘度的PDMDAAC的最佳复合配比，研究其混凝去除有机污染物的效果和混凝行为；通过在线监测混凝动态过程，研究不同B值的PACl分别与不同粘度的PDMDAAC在最佳复合比下产生的絮体特性与差异，研究其絮体特性与混凝行为之间的关系；通过测定膜通量变化及膜污染情况，研究PACl—PDMDAAC复合混凝剂的混凝行为和絮体特性对混凝-超滤组合工艺水处理效能和膜污染影响情况，进而研究混凝-超滤组合工艺中膜污染的机制，建立PACl—PDMDAAC混凝行为、絮体特性与混凝-超滤组合工艺的水处理效果和膜污染机制之间的关系模型。

Dissolved organic matter commonly considered as one of the most important predecessor of by-product of chlorination (DBPs) in water treatment processes, and the control of its existence in water bodies is one of the key matter for insurance of water supply security. This research project aiming to apply a novel norganic-organic composite flocculant, polymeric aluminium-chloride- Polydimethyldiallylammonium Chloride (PACl-PDMDAAC) in coagulation-ultrafiltration hybrid process (C-UF) for treatment of surface water source. The coagulation behavior, floc characteristics of PACl-PDMDAAC and their relationship with coagulation performance and membrane fouling mechanism would be investigated. To be specific, the research contents including: (1) PACl-PDMDAAC would be composite by PACl with different basicity (B) with PDMDAAC of various viscosities (η) at varying ratios; (2) Simulated water samples and real water samples would be chosen as target water. The optimum ratio for PACl of different B value and PDMDAAC of various viscosities would be selected according to their coagulation performance in treatment of target water. Furthermore, their organic pollutant reduction efficiencies and coagulation behavior would be studied; (3) By using on-line monitoring of coagulation dynamic process, the variation floc characteristics formed by PACl (B) –PDMDAAC (η) would be determined, and its relationship with coagulation behavior of the flocculants would be investigated; (4) The impacts of PACl (B) –PDMDAAC (η) coagulation behavior/floc characteristics on coagulation performance of C-UF process and the membrane fouling would be investigated by monitoring the change of membrane flux. Furthermore, the mechanism of C-UF system would be studied, and the relational model of PACl-PDMDAAC coagulation behavior,/floc characteristics with coagulation performance/membrane fouling mechanism would be established.