Research progress on fouling of ultrafiltration membrane by metal ion and humic acid
Membrane fouling is a major obstacle limiting the large-scale application of ul-trafiltration technology in drinking water production.The adsorption or deposition of natural organic matter represented by humic acid on the membrane surface is one of the main caus-es of fouling of ultrafiltration membrane.Metal ions widely existing in water environment hardly cause membrane fouling,but metal ions can affect ultrafiltration humic acid through charge shielding,charge neutralization,complexation and bridging,resulting in organic,inor-ganic and composite membrane fouling.Based on the research results at home and abroad,the influence mechanism of univalent(Na+,K+),bivalent(Ca2+,Mg2+)and trivalent(Fe3+,Al3+)metal ions on the humic acid fouling of ultrafiltration membrane were systematically analyzed in this paper,which provided new insights for alleviating the problem of ultrafiltra-tion membrane fouling caused by humic acid.
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维普
