Study of the effect of polyaluminium chloride on treating the grey water of paper industry

The effect of the base saturability, the dosage and the temperature of coagulation of PAC on the grey water of paper industry has been studied. The result shows that: as far as the PAC in accordance with the GB standard is concerned, its specific base saturability has a greater effect on the grey water of paper industry. The treatment of the grey water of paper industry from Xihuafeng, Wuzhi, Henan province has been stated as follows: When the dosage of PAC with 75% of base saturability is 0.6 g/L water, the removal rate of COD is 69%, removal rate of SS is 84%, the treated wastewater can meet the requirement of the discharging standard.