Abstract: Petrochemical wastewater includes much oil,expecially emulsification oil which is hard to be removed. Many factors which influence the effect of flocculation of petrochemical wastewater are studied. The results show that macromolecule flocculation PAC can have the best effect. When its dosage is 50 g/m3 and the water s pH ranges from 8 to 11,the best removal effects of turbidity and COD can be got,95 % and 60 % respectively.

Key words: petrochemical wastewater; flocculation; turbidity; removal of COD;