Abstract: The paper studies the Mn₃O₄ wastewater treatment with the composite flocculant of Polyaluminium Chloride and investigates the flocculating effects by adding the amount of PAC and PAM and the time required.The experiment results showed that the flocculating effects can be optimum when adding 5 mg/L of PAC, 0.6 mg/L of PAM for 30 min.The turbidity removal rate reached 94.8%, which has been satisfied with the State Standard for Industrial Sewage Discharge.This paper also briefly analyzes some problems in application of composite flocculant to industrial wastewater treatment of Mn₃O₄.

Key words: Composite flocculant, Mn₃O₄, Industrial wastewater