Two laboratory-made cationic starch-based flocculants (St-CTA and St-AD) with different chain architectures were used to simultaneously remove phosphorus and turbidity from two simulated wastewaters and one actual wastewater with laboratory and pilot scales, respectively, in conjunction with FeCl₃. A commercial polyacrylamide (PAM) has been also tried and compared with aforementioned starch-based flocculants. The removal extents of phosphorus and turbidity increased, the required dosages of FeCl₃ decreased, and floc properties improved after dosing each polymeric flocculant after FeCl₃ in all tested wastewaters due to their synergistic effects. However, the three flocculants exhibited different improvement efficiencies on the treated wastewaters containing different forms of phosphorus and showed various synergistic mechanisms owing to their distinct structural features. In inorganic–phosphorus-simulated wastewater, the linear nonionic PAM with a high molecular weight had a more notable contribution than the two starch-based flocculants due to its efficient bridging flocculation effect. Given the branched-chain structure and high positive charge density of St-AD, it had a higher efficiency in treating real wastewater and organic–phosphorus-simulated wastewater than PAM and linear cationic St-CTA. These results may serve as references for the design and selection of a suitable flocculant in treating target wastewaters.

两种具有不同链结构的实验室制造的阳离子淀粉基絮凝剂（St-CTA和St-AD）用于同时去除两种模拟废水和一种实际废水（实验室规模和中试规模）以及FeCl的磷和浊度。₃。还已经尝试了商业聚丙烯酰胺（PAM），并将其与上述淀粉基絮凝剂进行了比较。磷和浊度去除率程度增加，的FeCl的所需剂量₃下降，和后的FeCl给药各聚合物絮凝剂后絮凝体特性改善₃由于它们的协同作用，在所有测试的废水中都能发挥作用。然而，这三种絮凝剂对含不同形式磷的处理废水表现出不同的改善效率，并且由于其独特的结构特征而显示出多种协同机制。在无机磷模拟废水中，具有高分子量的线性非离子型PAM由于具有有效的架桥絮凝作用，因此比两种淀粉基絮凝剂具有更显着的贡献。鉴于St-AD的支链结构和高正电荷密度，它在处理真实废水和有机磷模拟废水中的效率比PAM和线性阳离子St-CTA高。这些结果可为设计和选择合适的絮凝剂处理目标废水提供参考。