Water reclamation from emulsified oily wastewater via effective forward osmosis hollow fiber membranes under the PRO mode
Water reclamation from emulsified oily wastewater via effective forward osmosis hollow fiber membranes under the PRO mode
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DOI：
10.1016/j.watres.2015.05.048
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发表时间：
2015-09-15
期刊：
影响因子：
12.8
通讯作者：
Chung, Tai-Shung
中科院分区：
文献类型：
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作者：
Han, Gang;de Wit, Jos S.;Chung, Tai-Shung
通过使用新型亲水性乙酸丁酸纤维素（CAB）作为中空纤维基材的膜材料，并通过聚多巴胺（PDA）涂层对其外表面进行改性，通过界面聚合对其内表面进行改性，我们已经证明，薄膜复合（TFC）膜可以有效地用于在压力延迟渗透下通过正向渗透（FO）从乳化油/水流中可持续地回收水（PRO）模式。新开发的TFC-FO中空纤维膜具有高水通量、高脱盐率、低污染性和良好的隔油性能。在PRO模式下，新开发的TFC-FO膜显示出37.1 L m（-2）h（-1）的水通量，其中使用2000 ppm大豆油/水乳液作为进料和1 M NaCl作为汲取溶液，油截留率为99.9%。还观察到了显著的防污行为。在PRO模式下，即使在12小时的油/水分离试验后，水通量下降仅为初始值的10%。在不使用任何化学品的情况下，通过对纤维外表面进行水洗，可以有效地使污染膜的水通量恢复到原来的97%。此外，当含有0.04M NaCl的2000 ppm大豆油/水乳液和2000 ppm石油油/水乳液的水回收率分别达到82%时，通量下降仅为25%和52%。本研究不仅可以为PRO模式下制备具有高性能和低污染行为的有效TFC-FO膜提供有见地的指导，而且还可以为用于水净化目的的新材料的设计提供另一种视角。(C)2015爱思唯尔有限公司版权所有。
By using a novel hydrophilic cellulose acetate butyrate (CAB) as the membrane material for the hollow fiber substrate and modifying its outer surface by polydopamine (PDA) coating and inner surface by interfacial polymerization, we have demonstrated that the thin-film composite (TFC) membranes can be effectively used for sustainable water reclamation from emulsified oil/water streams via forward osmosis (FO) under the pressure retarded osmosis (PRO) mode. The newly developed TFC-FO hollow fiber membrane shows characteristics of high water flux, outstanding salt and oil rejection, and low fouling propensity. Under the PRO mode, the newly developed TFC-FO membrane exhibits a water flux of 37.1 L m(-2) h(-1) with an oil rejection of 99.9% using a 2000 ppm soybean oil/water emulsion as the feed and 1 M NaCl as the draw solution. Remarkable anti-fouling behaviors have also been observed. Under the PRO mode, the water flux decline is only 10% of the initial value even after a 12 h test for oil/water separation. The water flux of the fouled membrane can be effectively restored to 97% of the original value by water rinses on the fiber outer surface without using any chemicals. Furthermore, the flux declines are only 25% and 52% when the water recovery of a 2000 ppm soybean oil/water emulsion and a 2000 ppm petroleum oil/water emulsion containing 0.04 M NaCl reaches 82%, respectively. This study may not only provide insightful guidelines for the fabrication of effective TFC-FO membranes with high performance and low fouling behaviors for oily wastewater under the PRO mode but also add an alternative perspective to the design of new materials for water purification purposes. (C) 2015 Elsevier Ltd. All rights reserved.