Study and Application of a Novel Tap Water Flocculant

By using polyaluminum chloride (PAC), chitosan (CTS) and montmorillonite (MM) as the main raw materials, a novel tap water flocculant had been prepared. The optimal mass proportion of this flocculant was 1 g.L-1 chitosan:50 g.L-1 PAC:3g.L-1 MM = 30:11:7. Compared with the traditional polyaluminum chloride (PAC), the concentration of alumi- num ion (Al3+) and suspended solids (SS) in the exit dropped 66.19% and 5.80% respectively, moreover, the cost was decreased by 9.95%. This flocculant was not only cheaper, but also provided improved flocculating function compared with traditional flocculant. The concentration of Al3+ in exit water was decreased greatly so the drinking water would be much safer.