不同水质纳滤分离效果及对纳滤膜的影响

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关键词：零排放；纳滤膜；纳滤分离；多价金属离子；废酸净化 中图分类号：X703 文献标识码：A 文章编号：1008-9500（2025）05-0029-06 DOI： 10.3969/j.issn.1008-9500.2025.05.006

Abstract： Three types ofnanofiltration membranesaretested for separation eficiency using wastewaterofdiferent water qualities to explore thefeasibilityof nanofiltration separation inzerodischarge wastewater treatment.The experimental results show that under neutral conditions，the nanofiltration membrane can efectively separate Cl Π- and SO4²-，and the retention rate of SO can exceed 96 % ; in acidic environments，the retention rate of SO by nanofiltration membranes significantly decreases，for the sodium oxalate sodium sulfate system，the highest retention rate of SO is only 44.37% ， thefeasibilityof using nanofiltrationseparation islow，testshavefound thatthissystemcauses ireversibledamage tothe nanofitration membrane.Inacidic environments，theretentionrateof multivalentmetalions bynanofiltration membrane is stillhigh，therefore，nanofiltration membranescan treat multivalent metalionacidic waste liquids，achieving the purposeof waste acid purification and recovery of multivalent metal salts.

Keywords：zero emissions; nanofiltration membrane; nanofiltration separation; multivalent metal ions;waste acid purification

随着社会经济的高速发展，我国工业废水的排放量持续增加，2023年达到646亿 m3 左右。（剩余6457字）