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Effects of shear rate on membrane filtration

机译：剪切速率对膜过滤的影响

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摘要

Appropriate and advanced wastewater treatment is necessary to effectively decrease the organic load of dairy wastewater before disposal. Despite the advantages of membrane filtration, membrane fouling is still a critical issue which limits the application of industrial membrane utilizations. For this reason increasing the shear rate on the membrane surface is frequently used to reduce the deposition of particles. Currently, limited data is available from previous studies on the application of vibratory shear enhanced processing (VSEP) for dairy wastewater treatment. In this work the feasibility of the purification of dairy wastewater was investigated by a laboratory mode VSEP. Ultrafiltration (UF) and nanofiltration (NF) membranes were tested using both vibration and non-vibration processes with the same parameters. In order to investigate the effects of shear rate, firstly, the influences of the recirculation flow rate of the feed solution on the membrane filtration performance were analyzed. Secondly, to understand the membrane fouling mechanisms in depth, the shear rates on the surface of the membrane were calculated and investigated during vibration and non-vibration process. Finally, UF and NF rejections, based on chemical oxygen demand (COD), conductivity, protein, lactose and dry matter content, and the calculated specific energy consumptions were compared also during both UF and NF separation experiments.
机译：必须进行适当而先进的废水处理，才能有效减少处置前乳品废水的有机负荷。尽管膜过滤具有优势，但膜结垢仍然是一个关键问题，它限制了工业膜应用的应用。由于这个原因，提高膜表面的剪切速率通常被用来减少颗粒的沉积。当前，关于振动剪切增强处理（VSEP）在乳品废水处理中的应用的先前研究提供的数据有限。在这项工作中，通过实验室模式VSEP研究了提纯乳品废水的可行性。使用具有相同参数的振动和非振动过程测试了超滤（UF）和纳滤（NF）膜。为了研究剪切速率的影响，首先，分析了进料溶液的再循环流速对膜过滤性能的影响。其次，为了深入了解膜的结垢机理，在振动和非振动过程中计算并研究了膜表面的剪切速率。最后，在UF和NF分离实验中，还根据化学需氧量（COD），电导率，蛋白质，乳糖和干物质含量以及计算出的比能耗，对UF和NF截留率进行了比较。

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