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首页> 外文期刊>Environmental Science & Technology >Viscoelastic Properties of Extracellular Polymeric Substances Can Strongly Affect Their Washing Efficiency from Reverse Osmosis Membranes
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Viscoelastic Properties of Extracellular Polymeric Substances Can Strongly Affect Their Washing Efficiency from Reverse Osmosis Membranes

机译：细胞外高分子物质的粘弹性能强烈影响其反渗透膜的洗涤效率

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摘要

The role of the viscoelastic properties of biofouling layers in their removal from the membrane was studied. Model fouling layers of extracellular polymeric substances (EPS) originated from microbial biofilms of Pseudomonas aeruginosa PAO1 differentially expressing the Psl polysaccharide were used for controlled washing experiments of fouled RO membranes. In parallel, adsorption experiments and viscoelastic modeling of the EPS layers were conducted in a quartz crystal microbalance with dissipation (QCM- D). During the washing stage, as shear rate was elevated, significant differences in permeate flux recovery between the three different EPS layers were observed. According to the amount of organic carbon remained on the membrane after washing, the magnitude of Psl production provides elevated resistance of the EPS layer to shear stress. The highest flux recovery during the washing stage was observed for the EPS with no Psl. Psl was shown to elevate the layer's shear modulus and shear viscosity but had no effect on the EPS adhesion to the polyamide surface. We conclude that EPS retain on the membrane as a result of the layer viscoelastic properties. These results highlight an important relation between washing efficiency of fouling layers from membranes and their viscoelastic properties, in addition to their adhesion properties.
机译：研究了生物污损层的粘弹性在从膜中去除中的作用。来自铜绿假单胞菌PAO1差异表达Psl多糖的微生物生物膜的细胞外聚合物质（EPS）的模型污垢层用于污垢反渗透膜的受控洗涤实验。平行地，在具有耗散的石英晶体微量天平（QCM-D）中进行EPS层的吸附实验和粘弹性模型。在洗涤阶段，随着剪切速率的提高，在三个不同的EPS层之间观察到渗透通量回收率的显着差异。根据洗涤后残留在膜上的有机碳量，Psl的产生量可提高EPS层对剪切应力的抵抗力。对于没有Psl的EPS，在洗涤阶段观察到最高的通量回收率。已显示Psl提高了该层的剪切模量和剪切粘度，但对EPS对聚酰胺表面的粘附没有影响。我们得出结论，由于层粘弹性，EPS保留在膜上。这些结果凸显了膜的结垢层的清洗效率与其粘着性能之间的重要关系。

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  • 来源
    《Environmental Science & Technology》 |2016年第17期|9206-9213|共8页
  • 作者

    Diana Lila Ferrando Chavez; Ali Nejidat; Moshe Herzberg;

  • 作者单位

    The Jacob Blaustein Institutes for Desert Research, Zuckerberg Institute for Water Research, The Albert Katz International School of Desert Studies, Ben Gurion University of the Negev, Sede Boqer Campus, Midreshet Ben Gurion 84990, Israel;

    The Jacob Blaustein Institutes for Desert Research, Zuckerberg Institute for Water Research, The Albert Katz International School of Desert Studies, Ben Gurion University of the Negev, Sede Boqer Campus, Midreshet Ben Gurion 84990, Israel;

    The Jacob Blaustein Institutes for Desert Research, Zuckerberg Institute for Water Research, The Albert Katz International School of Desert Studies, Ben Gurion University of the Negev, Sede Boqer Campus, Midreshet Ben Gurion 84990, Israel;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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