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首页> 外文期刊>Separation and Purification Technology >Direct nanofiltration of surface water using capillary membranes: comparison with flat sheet membranes
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Direct nanofiltration of surface water using capillary membranes: comparison with flat sheet membranes

机译：使用毛细管膜直接对地表水进行纳滤：与平板膜的比较

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This article explores the possibilities of a new capillary nanofiltration membrane (manufactured by Stork/X-Flow, The Netherlands), designed to reduce membrane fouling and thus allowing to omit or reduce the extensive pretreatment usually required for the implementation of nanofiltration in drinking water production. In the laboratory, the membrane performance (flux decline and flux recovery) during nanofiltration of surface water from the river Dijle, Flanders, Belgium was compared with that of a series of nine commercial flat sheet membranes. All membranes showed flux decline to some extent. For the capillary membrane, the water flux could, however, easily be increased and maintained at a stable level by a combination of forward flushing and airflushing, which is not possible with the flat sheet membranes. Furthermore, the water permeability of the capillary membrane was three to 15 times higher than for the commercial flat sheet membranes, which leads to lower operating pressure and a corresponding lower energy consumption. For the capillary membrane rejections of organic and inorganic compounds were satisfactory to reach for COD and conductivity standards in one step starting from the Dijle water. Rejections for most flat sheet membranes were comparable to the rejections obtained with the capillary membrane, but the rejection of ions was usually higher, except for the N30F and NF PES 10 membranes (Nadir, Germany). Low ion rejections are advantageous for drinking water production because demineralization is avoided.
机译：本文探讨了新型毛细管纳米过滤膜（由Stork / X-Flow，荷兰制造）的可能性，该膜旨在减少膜污染，从而省去或减少饮用水生产中实施纳米过滤通常所需的广泛预处理。 。在实验室中，对比利时弗兰德斯迪杰尔河的地表水进行纳滤时的膜性能（通量下降和通量恢复）与一系列九种商用平板膜的性能进行了比较。所有膜均显示出一定程度的通量下降。然而，对于毛细管膜，通过向前冲洗和空气冲洗的组合，可以容易地增加水通量并将其维持在稳定水平，这对于平板膜而言是不可能的。此外，毛细管膜的水渗透性是市售平板膜的三至十五倍，这导致较低的工作压力和相应的较低的能耗。对于毛细管膜，从Dijle水开始的一步中，有机和无机化合物的拒收率就可以令人满意地达到COD和电导率标准。大多数平板膜的排斥率与毛细管膜的排斥率相当，但除N30F和NF PES 10膜（德国纳迪尔）外，离子的排斥率通常更高。由于避免了脱矿质，所以低的离子排阻对于饮用水的生产是有利的。

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