天然原水中DOM对纳滤膜的污染分析及过滤特性研究

Fouling analysis and filtration characteristics of nanofiltration membrane caused by DOM in natural raw water

实验研究了天然原水中溶解性有机物(DOM)对纳滤膜污染特性的影响.原水中的DOM分离得到相对分子质量小于100000、小于50000、小于30000、小于10000和小于3000的亲水性和疏水性有机物,对其进行纳滤膜过滤试验.结果表明,疏水性有机物组分对纳滤膜造成的通量衰减程度和衰减速率均高于相同分子质量区间的亲水性有机物组分;亲水性有机物组分对膜通量影响较大的物质为小分子有机物,疏水性有机物组分对膜通量影响较大的物质为大分子有机物;有机物的亲疏水性和相对分子质量大小均会影响纳滤膜对有机物的截留率.

The effect of dissolved organic matters(DOM)in natural raw water on the fouling characteristics of nanofiltration membrane was studied.The hydrophilic and hydrophobic organic compounds with relative molecular weights less than 100000,less than 50000,less than 30000,less than 10000 and less than 3000 were separated from DOM in raw water,and the nanofiltration membrane filtration test was carried out.The results show that the flux attenuation degree and attenuation rate of hydrophobic organic components to nanofiltration membrane are higher than those of hydrophilic organic components in the same molecular weights range.The substances whose hydrophilic organic components have great influence on membrane flux are small molecular organic compounds,and those whose hydrophobic organic components have great influence on membrane flux are macromolecular organic compounds.The hydrophilicity and molecular weights of organic matters would affect the rejection rate of organic matters by nanofiltration membrane.