Study on Effect and Mechanism of Chitosan Coagulation Aid in Flocculation Treatment of Water Supply

摘要

The aim of this work is to remove residual turbidity and index of Potassium permanganate of the drinking water by PAC/Chitosan coagulation treatment. The experiments were performd the efficiency of coagulation by PAC/Chitosan at different chitosan dosages , molecular weight and pH value. Zeta potential instrument and Nikon electron microscope were used to test Zeta potential and observe floes morphology. It turn out that Chitosan enhance the flocculation Ireatment of the surface water of raw water of Yellow River by polymeric aluminum chloride (PAC)when PAC dosage is 35 mg-1-l and Chitosan is 0.15 mg-1-1 and infer coagulation aid mechanism was interpartical bridging rather than the electrical neutralization. Microscope and image analysis system of floes morphology show that fractal dimension of morphology of PAC and PAC/Chitosan were 1.294,1.385, respectively.