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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.
Microfiltration (MF) membrane filtration test was carried out on pre-ozonized Huangpu River raw water to investigate the effect of pre-ozonation on organic compounds, and then the effect of pre-ozonation on the filtration characteristics of MF membrane was investigated.The results showed that the ozone dosage was between 0.5-3.0 mg / L range, the removal rate of ozone to DOC is only 10%, while the removal rate to UV254 is up to 71% .With the increase of ozone dosage, the relative molecular mass is in the range of 2 × 103 ~ 7 × 103 Organic matter is gradually reduced, while the relative molecular mass <0.5 × 103 organic matter is almost unchanged.Ozone can be part of the hydrophobic organic oxidation of hydrophilic organic matter, only a small part of the conversion into inorganic matter, the organic composition of the structure changes affect the membrane Filtration resistance, thereby improving the membrane permeable flux effect.Ozone dosage in the range of 0.5 ~ 3.0 mg / L, there is an optimal ozone dosage of 1.5 mg / L, the membrane flux to a maximum value.This is mainly As the ozone dose, the ozonization of the composition of the organic structure of the membrane filtration resistance to minimize.