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本试验是在微污染水源水中有机物分布调查的基础上,采用聚偏氟乙烯(PVDF)微滤膜(MF)过滤微污染地表水,考察微滤膜对天然水中有机物的影响作用.试验结果表明,黄浦江微污染水源水中的有机物分子质量主要集中在3~5 k Da和0.2 k Da附近,且疏水性有机物和亲水性有机物所占的比例相当.有机物季节性分布特征明显,冬季溶解性有机碳(DOC)的值偏高,而UV254和比紫外吸光度值(SUVA)则在夏季偏高.黄浦江原水经微滤膜过滤后,有机物构成发生明显变化,膜出水中的亲水性有机物的比例增加,而疏水性有机物的比例降低,DOC和UV254的平均去除率分别为17.73%和15.75%.黄浦江原水及经0.45μm滤膜过滤以去除悬浮物的黄浦江原水分别进行微滤膜过滤,膜比通量的对比发现,在较短时间内两者的膜比通量下降都很明显,而后膜比通量都趋于平缓,变化趋势及结果基本一致,可见,黄浦江水中造成膜通量下降的物质并不是悬浮物,而是溶解性的有机物质.
This experiment is based on the investigation of the organic matter distribution in the micro-polluted water, and the micro-polluted surface water is filtered by polyvinylidene fluoride (PVDF) microfiltration membrane (MF) to investigate the effect of microfiltration membrane on the organic matter in natural water. , The molecular weight of organic matter in the slightly polluted water of Huangpu River is mainly concentrated in the vicinity of 3 ~ 5 kDa and 0.2 kDa, and the proportion of hydrophobic organic substance and hydrophilic organic substance is quite high.The seasonal distribution of organic matter is obvious, and the winter solubility Organic carbon (DOC) values were high while UV254 and specific ultraviolet absorbance values (SUVA) were higher in the summer.While the Huangpu River raw water was filtered through microfiltration membrane, the composition of organic matters changed obviously, and hydrophilic organic compounds , While the proportion of hydrophobic organic compounds decreased, and the average removal rates of DOC and UV254 were 17.73% and 15.75%, respectively. The Huangpu River raw water and the Huangpu River raw water filtered through 0.45μm membrane to remove suspended solids were respectively subjected to microfiltration Filtration, membrane specific flux comparison found that in a relatively short period of time both the membrane flux decreased significantly, and after membrane flux tends to be flat, the trend and the results are basically the same, we can see that the Huangpu River water Flux decline is not a substance suspension, but the solubility of the organic material.