Study on Coagulation-Microfiltration Combination Process for Treating Luan River Water

Study on coagulation-microfiltration combination process for treatment of Luan river water was carried out. The experimental results showed that when the dosage of FeCl₃ was 35 mg/L, the removal of turbidity was above 95%, the organic matter was above 50%, and recovery of membrane flux reached 81% for the combination process. On the other hand, among the four coagulants (FeCl₃, Polymeric Ferric Sulfate, Al₂(SO4)3, Polymeric Aluminum Chloride) the iron-based coagulant is superior to Al-based coagulant not only in the removal of turbidity but also the organic matter, and the effect of coagulation was affected by pH. The results also suggested that coagulation could mitigate membrane fouling, and the influent water quality of MF membrane process which followed coagulation could be improved.