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Utilization of NaCl solutions to clean ultrafiltration membranes fouled by whey protein concentrates

机译：利用NaCl溶液清洁浓缩乳清蛋白的超滤膜

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摘要

In this work, whey protein concentrate (WPC) solutions at different concentrations (22.2, 333 and 150 g L-1) were used to foul three ultrafiltration (UF) membranes of different materials and molecular weight cut-offs (MWCOs): a polyethersulfone (PES) membrane of 5 kDa, a ceramic ZrO2-TiO2 membrane of 15 kDa and a permanently hydrophilic polyethersulfone (PESH) membrane of 30 kDa. NaCl solutions at different salt concentrations, temperatures and crossflow velocities were used to clean the UF membranes tested. The cleaning efficiency was related to the MWCO, membrane material and operating conditions during fouling and cleaning steps. NaCl solutions were able to completely clean the membranes fouled with the WPC solutions at the lowest concentration tested. As WPC concentration increased, the hydraulic cleaning efficiency (HCE) decreased. The results demonstrated that an increase in temperature and crossflow velocity of the cleaning solution caused an increase in the HCE. Regarding NaCl concentration, the HCE increased up to an optimal value. As the concentration was greater than this value, the cleaning efficiency decreased. In addition, an equation that correlates the cleaning efficiency to the operating parameters studied in this work (temperature, NaCl concentration, crossflow velocity in the cleaning procedure and WPC concentration during the fouling step) was developed and then, an optimization analysis was performed to determine the values of the parameters that lead to a 100% cleaning efficiency. (C) 2015 Published by Elsevier B.V.
机译：在这项工作中，使用了不同浓度（22.2、333和150 g L-1）的乳清蛋白浓缩物（WPC）溶液污染了三种不同材料和分子量截留值（MWCO）的超滤（UF）膜：聚醚砜（PES）膜为5 kDa，陶瓷ZrO2-TiO2膜为15 kDa，永久亲水性聚醚砜（PESH）膜为30 kDa。用不同盐浓度，温度和错流速度的NaCl溶液清洗被测超滤膜。在结垢和清洁步骤中，清洁效率与MWCO，膜材料和操作条件有关。 NaCl溶液能够以最低的测试浓度完全清洁被WPC溶液污染的膜。随着WPC浓度的增加，液压清洁效率（HCE）降低。结果表明，清洁溶液的温度和错流速度的增加引起HCE的增加。关于NaCl浓度，HCE增加到最佳值。当浓度大于该值时，清洁效率降低。此外，还建立了将清洗效率与该工作中研究的操作参数（温度，NaCl浓度，清洗过程中的错流速度和结垢步骤中的WPC浓度）相关联的方程式，然后进行了优化分析以确定导致100％清洁效率的参数值。 （C）2015由Elsevier B.V.发布

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