Several inorganic flocculating agents, including FeSO4, ˝l2(SO4)3, FeCl3 and an organic coagulant aid PAM, were used
to treat the wastewater from domestic animal and poultry breeding in this paper. The ideal operating conditions were
attained by single factor experiment and orthogonal design experiment. And the ideal operating conditions are follows: the
dose of FeSO4 and PAM is 135.2 mg/L and 0.384 mg/L respectively when keeping the pH 10; and the corresponding
removal rate is 55% and 60% for COD and turbidity. Based on the experimental results, this paper analyzes the main
factors that affect wastewater flocculation treatment.