Preparation and Application of a Novel Composite Flocculant for Tap Water Treatment

摘要

A new tap water flocculant had been prepared by using polyaluminium chloride (PAC),polysaccharide (PS) and modified starch (MS) as the main raw materials. The best formula of the compositeflocculant was found to be(0.1 % PAC: 0.01% PS: 3% MS = 30: 6: 7). Compared with traditional chemicalflocculant polyaluminum ferric chloride (PAFC), the prepared flocculant has turbidity in the treated water of3.35% and removal rate of aluminum up to 56.17%.In addition, the treatment cost was also reduced by about5.42% yuan per ton of water. The performance-price ratio of this composite flocculant was higher than that oftraditional flocculant, since it had a great effect on decreasing the concentration of Al3+, which in treated waterwas only 0.071 mg·L-1. This novel composite flocculant is safer than that of conventional one. So it has theimportant significance of extending and application in the tap water treatment.