With the rising popularity of Greek-style yogurts in the past few years, the production of acid whey has drastically increased. If sweet whey is usually further processed, the acid whey valorization comes with challenges because its drying is jeopardized by its high mineral and organic acid contents. For this reason, prior demineralization and deacidification are usually performed at industrial scale using a combination of ion exchange resins and electrodialysis. This whole process represents large amounts of resources and energy consumption as well as an important production of effluents. The optimization of the electrodialysis technique, currently the focus of a few studies, could result in the replacement of the serial processes and would provide a cost-effective and eco-efficient alternative. In this work, the demineralization and deacidification of acid whey were compared via 2 electrodialysis configurations: one conventional and one using bipolar membranes. Both configurations allowed to reach interesting demineralization (67%) and deacidification (44%) rates. However, even though the appearance of fouling or scaling has never been reported, scalings of different natures were observed on membranes using both configurations. Amorphous calcium phosphate was identified on the anion exchange membranes for both configurations while calcite and brucite were identified on cation exchange ones using the bipolar membrane configuration. These scaling formations were linked to the migration of divalent ions and water splitting phenomenon caused by a high demineralization rate or by an already formed significant scaling.

在过去几年中，随着希腊式酸奶的日益普及，酸乳清的产量急剧增加。如果通常对甜乳清进行进一步加工，那么酸乳清的增值将面临挑战，因为其干燥会因其较高的矿物质和有机酸含量而受到危害。为此，通常使用离子交换树脂和电渗析的组合以工业规模进行先有的脱盐和脱酸。这整个过程代表着大量的资源和能源消耗以及重要的废水生产。当前，一些研究的重点是电渗析技术的优化，这可能会导致连续过程的替代，并提供一种经济高效且生态高效的替代方案。在这项工作中，酸乳清的脱盐和脱酸通过两种电渗析方法进行了比较：一种是常规的，另一种是使用双极性膜的。两种配置均允许达到有趣的脱盐率（67％）和脱酸率（44％）。然而，即使从未报道过结垢或结垢的外观，使用两种配置在膜上也观察到了不同性质的结垢。在阴离子交换膜上，使用双极性膜结构可鉴定出无定形磷酸钙，而在阳离子交换膜上可鉴定出方解石和水镁石。这些结垢的形成与高脱盐率或已经形成的显着结垢引起的二价离子迁移和水分解现象有关。