摘要
膜污染是限制超滤技术在饮用水生产方面大规模应用的一大障碍.以腐殖酸(Humic Acid,HA)为代表的大分子天然有机物吸附或沉积在膜表面是引起超滤膜污染的主要原因之一.广泛存在于水环境中的金属离子几乎不会造成膜污染,但金属离子会通过电荷屏蔽、电荷中和、络合和架桥等作用对超滤膜HA产生影响,引起有机、无机以及复合膜污染问题.本文参考国内外研究成果,系统分析了一价(Na+、K+)、二价(Ca2+、Mg2+)和三价(Fe3+、Al3+)金属离子对超滤膜HA污染的影响机理,为缓解HA引起的超滤膜污染问题提供了新的见解.
Abstract
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.
维普
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