预臭氧化对MF膜处理黄浦江水的影响研究

采用预臭氧化处理黄浦江原水后进行微滤（MF）膜过滤试验，考察预臭氧化对有机物的作用，进而考察其对MF膜过滤特性的影响.结果表明，臭氧投量在0.5～3.0 mg/Ｌ范围内时，臭氧对DOC的去除率最高仅为10%，而对UV254的去除率最高可达71%.随着臭氧投量的增加，相对分子质量在2×10³～7×10³的有机物逐渐减少，而相对分子质量＜0.5×10³的有机物则几乎没有改变.臭氧可把部分疏水性有机物氧化成亲水性有机物，只有很少部分转变成无机物，这种有机物组成结构的改变影响了膜过滤阻力，进而改善了膜透水通量的效果.臭氧投量在0.5～3.0 mg/Ｌ范围内，存在一个最佳的臭氧投量1.5 mg/Ｌ，使膜通量达到最大值.这主要是由于在该臭氧投量下，臭氧化对有机物的组成结构的改变使膜过滤阻力达到最小.

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 UV254 by ozone are 10% and 71% respectively during 0.5_3.0 mg/L ozone dosage. With increasing of ozone concentration,organic substances of 2×103_7×103 reduce gradually,while organic matter of which less than 0.5×103 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.