对纳滤膜在不同产水率条件下的净水性能和膜通量衰减过程,以及纳滤膜在产水率90％条件下的运行特性进行了分析.采用MBR作为预处理与纳滤膜联用,考察联用工艺对水中氨氮和有机物的去除效果,以及MBR膜和纳滤膜的污染情况.结果表明,相比于额定工况,纳滤膜在90％产水率条件下运行,对有机物的去除率和脱盐率分别降低4％和3.5％,仍具有优越的净水性能;膜通量衰减速度增加17％.研究同时表明,降低纳滤膜进水中有机物的浓度能够有效缓解纳滤膜的污染过程,使纳滤膜能够在90％产水率条件下保持较高的通量.MBR与纳滤膜联用对氨氮和TOC表现出良好的去除效果,在进水浓度为1.5 mg/L、3.5 mg/L时,出水分别降低到0.4 mg/L、0.2 mg/L.MBR通过去除水中的颗粒物和有机物,有效地缓解了纳滤膜的污染过程,在60天的运行中纳滤膜通量仅下降24.7％,但MBR膜TMP增长较快,试验中共进行了6次膜清洗.
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