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This study explored the influence of feed pH on permeate pH and rejections of ions under acidic conditions in NF process. A Desal-5 NF membrane was tested. Town water, 10mM NaCl and 10mM NaNO 3 in deionized water were used as raw feed. Feed pH in the range of 1-7 was investigated. A critical feed pH was observed for each solution. Above the critical pH value NF permeate pH was lower than feed...
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