Pilot Study of a Hybrid Process combining Oxidation- coagulation -microfiltration for Drinking Water Production from Surface Water

In this study, microfiltration (MP) combined with oxidation and coagulation was investigated for production of drinking water by Huangpu River. The experiment focused on the effects of various oxidants on reduction in fouling and improvement in quality of treated water. 0.5 mg/L of ozone, 1.5 mg/L of sodium hypochlorite and 0.3 mg/L of potassium permanganate were added before membrane to reduce the fouling. The results showed that significant differences in permeate water and trends of TMP exhibited by adding different oxidants. With ozone as pre-oxidation, permeate water could meet China Drinking Water Regulations (CDWR), however, part of water quality met CDWR with sodium hypochlorite and potassium permanganate as pre-oxidation. IMP increased slowly during filtration period for a long time when ozone and sodium hypochlorite were added. With potassium permanganate as pre-oxidation, rapid increase in IMP was observed, which can be attributed to a lot of manganese oxides deposited in the membrane by analyzing chemical cleaning water. Chemical cleaning of membrane could decrease IMP to initial level. Analysis of chemical cleaning solution indicated that organic matters was responsible for the most fouling, and ozone could reduce membrane fouling effectively.