[Effect of preozonation on microfiltration for Huangpu River].

This study investigated the effect of preozonation on organic matter and microfiltration membrane filtration, Huangpu River surface water ozonated was filtrated by MF membrane. The results show that highest rejection efficiency of DOC and UVr by ozone are 10% and 71% respectively during 0.5-3.0 mg/L ozone dosage. With increasing of ozone concentration, organic substances of 2 x 10(3)-7 x 10(3) reduce gradually, while organic matter of which less than 0.5 x 10(3) change slightly. Ozone oxidizes more hydrophobic fraction to hydrophilic one and only few to inorganic matter. Changes of organic matter composition affect membrane filtration resistance, thereby improve membrane flux. There is the optimal dosage with ozone of 1.5 mg/L made membrane flux maximum in the range of 0.5-3.0 mg/L ozone dosage. The reason is change of organic matter composition which made membrane filtration resistance minimum in the ozone dosage of 1.5 mg/L.