Abstract Desalination of nanofiltrated acid whey by electrodialysis in the temperature range 15 to 55 °C was investigated. Increased electrodialysis temperature caused increased total mass flux and electrodialysis capacity while specific energy consumption values were maintained. Weak organic acids removal from whey increased with temperature, leading to an increase in the degree of deacidification from 64.3% to 72.0% when the temperature increased from 15 to 55 °C. Protein losses were not observed at any temperature, and the increase in ED temperature did not affect the protein content of the desalted whey. IR spectroscopy showed that protein deposition occurred mainly in the surface layers of cation-exchange membranes. Conductivity and diffusion permeability of anion-exchange membranes increased after electrodialysis at elevated temperatures due to the enlargement of pores and channels of ion-exchange materials. Protein sorption by cation-exchange membranes significantly compensated for this effect and their transport properties changed to a much lesser extent.

中文翻译：

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高效电渗析脱盐对高温酸性乳清流的影响

摘要 研究了在 15 至 55 °C 温度范围内通过电渗析对纳米过滤酸乳清进行脱盐。电渗析温度升高导致总质量通量和电渗析能力增加，同时保持特定的能量消耗值。乳清中弱有机酸去除率随温度升高而增加，当温度从 15°C 升高到 55°C 时，脱酸度从 64.3% 增加到 72.0%。在任何温度下均未观察到蛋白质损失，并且 ED 温度的升高不会影响脱盐乳清的蛋白质含量。红外光谱表明蛋白质沉积主要发生在阳离子交换膜的表层。由于离子交换材料的孔和通道的扩大，在升高的温度下电渗析后阴离子交换膜的电导率和扩散渗透率增加。阳离子交换膜对蛋白质的吸附显着补偿了这种影响，并且它们的运输特性改变的程度要小得多。