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首页> 外文期刊>Separation and Purification Technology >Extracellular polymeric substances removal of dual-layer (PES/PVDF) hollow fiber UF membrane comprising multi-walled carbon nanotubes for preventing RO biofouling
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Extracellular polymeric substances removal of dual-layer (PES/PVDF) hollow fiber UF membrane comprising multi-walled carbon nanotubes for preventing RO biofouling

机译：包含多壁碳纳米管的双层（PES / PVDF）中空纤维超滤膜的细胞外聚合物去除，可防止RO生物污染

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The reverse osmosis (RU) pretreatment of the petrochemical refinery wastewater has been investigated using the dual-layer (PES/PVDF) hollow fiber nanocomposite membranes, which were fabricated comprising MWCNTs in both layers via the two-step TIPS/NIPS process. The dual-layer hollow fiber nanocomposite membrane had the reduced fouling propensity, the improved compaction resistance and the higher filtration performance than the dual-layer hollow fiber (PES/PVDF) membrane. The low concentration of bacteria in the permeate caused RO membrane biofouling due to the rapid growth in the environment of extracellular polymeric substances (EPS). In order to inhibit the RO membrane biofouling, EPSs were removed by using the hollow fiber nanocomposite UF membrane, including polysaccharides, biopolymers and proteins. The rejection of biopolymers (MWCO = 33 kDa) was higher than that of polysaccharides (MWCO = 40 kDa). With respect to protein removal, it was found that the bovine serum albumin and rejection of 90% could be achieved, which was strongly dependent on pH. The EPS removal achieved up to 98.2% with the optimized carboxylated MWCNTs loading in the (NcPES-0.2%)/(NcPV DF-0.5%) hollow fiber nanocomposite membrane. The permeate treated by the hollow fiber nanocomposite membrane had effectively inhibited the RO membrane biofouling by Escherichia coli, as a result of the lower concentration of turbidity and EPS. The resultant hollow fiber nanocomposite ultrafiltration membrane shows the feasibility of removing EPS coupled with a low rejection of total dissolved salts, which yields a superior pretreatment method to reduce biofouling of the subsequent purification by reverse osmosis. (C) 2015 Elsevier B.V. All rights reserved.
机译：已经使用双层（PES / PVDF）中空纤维纳米复合膜研究了石化炼油厂废水的反渗透（RU）预处理，该双层复合膜是通过两步TIPS / NIPS工艺在两层中均包含MWCNT制成的。与双层中空纤维（PES / PVDF）膜相比，双层中空纤维纳米复合膜具有降低的结垢倾向，改进的抗压性和更高的过滤性能。渗透物中细菌的低浓度由于细胞外聚合物（EPS）环境的快速增长而导致RO膜生物污染。为了抑制RO膜的生物结垢，使用中空纤维纳米复合超滤膜去除了EPS，其中包括多糖，生物聚合物和蛋白质。生物聚合物（MWCO = 33 kDa）的排阻高于多糖（MWCO = 40 kDa）。关于蛋白质的去除，发现可以达到90％的牛血清白蛋白和排斥率，这强烈依赖于pH。在（NcPES-0.2％）/（NcPV DF-0.5％）中空纤维纳米复合膜中加入优化的羧化MWCNT，EPS去除率高达98.2％。中空纤维纳米复合膜处理过的渗透物有效地抑制了大肠杆菌对RO膜的生物污染，这是因为浊度和EPS的浓度较低。所得的中空纤维纳米复合超滤膜显示出去除EPS的可行性以及总溶解盐的低截留率，从而产生了一种优异的预处理方法，可减少随后通过反渗透纯化产生的生物污染。 （C）2015 Elsevier B.V.保留所有权利。

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