Composite polymeric aluminum chloride(CPAC)made from polymeric aluminum chloride(PAC)and cationic polymer flocculant PGA was prepared. The results showed that CPAC was verified to be more rapid in improving theξpotential of flocculating grains than PAC.When B=2.0 and dose of Al(Ⅲ)was 5 mg/L, theξpotential was-8.9 mV,-6.9 mV,2 mV relating to ...