Pilot study on the control of algal membrane fouling by preoxidation with potassium permanganate composites
高锰酸盐复合药剂预氧化缓解超滤膜藻类污染的中试研究

The integrated process of preoxidation, coagulation, sedimentation and ultrafiltration was used to treat algae-rich water and evaluate its algae removal efficiency in pilot experiments. The mitigation and mechanism of membrane fouling by the preoxidation with potassium permanganate composites (PPC) were discussed. The results showed that the average algae removal rate increased about 28% with preoxidation at a PPC dosage of 0.6 mg/L. When treating algae-rich water with the integrate process, PPC preoxidation could enhance the performance of the pretreatment and control reversible and irreversible membrane fouling by reducing foulant load on the membrane. The experiment results of chemical cleaning showed that the recovery of transmembrane pressure in alkaline cleanning was much greater than that in acidic cleanning, which indicated that the main foulants on the membrane in the ultrafiltration of algae-rich water were organic matters.