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A study on the removal of organic acids from wastewaters using nanofiltration membranes

机译：纳滤膜去除废水中有机酸的研究

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摘要

This study aimed to evaluate the application potential of nanofiltration (NF) membranes for the rejection of organic acids in wastewaters. The rejection tests at different feed water chemistries, including pH and concentration, were performed on a laboratory scale using five different organic acids. The rejection of selected organic acids by the ES10 and NF270 membranes increased with increasing pH, depending on the degree of dissociation. The rejection of succinic and citric acids, which have molecular weights (M_ws) larger than or closer to the molecular weight cutoffs (MWCOs) of employed NF membranes, was over 90% irrespective of operating pressure. Contrarily, the rejection of organic acids with M_ws much smaller than MWCOs of the NF membranes increased gradually with increasing the applied pressure. The degree of organic acid rejection, except for formic acid, by the NF membranes was not significantly changed when altered in feed concentrations of 50-500 mg L~(-1). The rejection degree of charged organic solutes with M_w much smaller than MWCO of a NF membrane can be negatively affected by the presence of salts. Results of the short-term filtration test using an actual anaerobic effluent revealed that the NF270 efficiently removed organic acids from the wastewater. The increase of DOC rejection with filtration time could be explained by increase of electrostatic repulsion between membrane and dissociated organic acid and by membrane fouling. NF process showed considerable potential as an advanced wastewater treatment process for removing organic acids in wastewaters.
机译：这项研究旨在评估纳滤（NF）膜在废水中去除有机酸的应用潜力。使用五种不同的有机酸，在实验室规模下对包括pH和浓度在内的不同给水化学进行了拒收测试。 ES10和NF270膜对选定的有机酸的截留率随pH的升高而增加，具体取决于解离程度。分子量（M_ws）大于或接近所用NF膜的分子量截留值（MWCO）的琥珀酸和柠檬酸的排斥率均超过90％，而与工作压力无关。相反，随着施加压力的增加，M_ws比NF膜的MWCO小得多的有机酸的截留率逐渐增加。当进料浓度改变为50-500 mg L〜（-1）时，除甲酸外，NF膜对有机酸的排斥程度没有明显变化。 M_w比NF膜的MWCO小得多的带电荷有机溶质的排斥度可能受到盐的存在的负面影响。使用实际的厌氧废水进行短期过滤测试的结果表明，NF270有效地去除了废水中的有机酸。 DOC截留率随过滤时间的增加可以用膜与离解的有机酸之间的静电排斥力增加以及膜污染来解释。 NF工艺作为去除废水中有机酸的高级废水处理工艺具有巨大潜力。

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