高含盐模拟废水的纳滤膜和反渗透膜脱盐特性

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通过可低压操作的NF膜和RO膜的高含盐模拟废水分离试验,本文探讨在不同进水pH条件下的脱盐效果,分析盐浓度对膜通量和脱盐率的影响。结果表明,在pH≥5条件下,RO膜对单价和二价无机盐的脱盐率均可至少达到85%,NF膜对二价盐的脱盐率可至少达到70%,但单价盐的脱盐率呈低值;在膜分离过程中,两种膜的膜通量和脱盐率随进水的盐浓度上升呈下降趋势。RO膜的膜通量对盐浓度变化的敏感度高于NF膜,但脱盐率的盐浓度变化敏感度则相反。
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