Microbial Flocculant′s Application in Petrochemical Wastewater Treatment Kuang Jinrong Gong wenqi Lect., Educational Affairs Office, WUT, Wuhan 430070, China.strains of mircroorganisms, which were found to produce flocculant, were isolated from activated. After prescreening, a strain with high flocculating activity was obtained. The optimum culture conditions are: initiative pH is 7.5, culture time is 24 h, culture temperature is 30 ℃,rotation speed 170 r/min, the dosage of the culture is 100 mL.Compared with the use of traditional flocculant in petrochemical wastewater, microbial flocculant can not only result in reduction of flocculant′s usage but also bring about extremely purification results (the turbidity removal ratio amounted to 90.1%).microbial flocculant; petrochemical wastewater; application