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How Overlimiting Current Condition Influences Lactic Acid Recovery and Demineralization by Electrodialysis with Nanofiltration Membrane: Comparison with Conventional Electrodialysis

1
Institute of Nutrition and Functional Food (INAF) and Department of Food Sciences, Pavillon Paul-Comtois, Université Laval, Quebec, QC G1V 0A6, Canada
2
Laboratoire de Transformation Alimentaire et Procédés Électro-membranaires (LTAPEM, Laboratory of Food Processing and Electro-Membrane Processes), Pavillon Paul Comtois, Université Laval, Quebec, QC, G1V 0A6, Canada
*
Author to whom correspondence should be addressed.
Membranes 2020, 10(6), 113; https://doi.org/10.3390/membranes10060113
Received: 28 April 2020 / Revised: 20 May 2020 / Accepted: 23 May 2020 / Published: 27 May 2020
Acid whey is the main co-product resulting from the production of fresh cheeses and Greek-type yogurts. It generally goes through a spray-drying process prior to valorization, but it needs to be deacidified (lactic acid recovery) and demineralized beforehand to obtain a powder of quality with all the preserved compounds of interest such as lactose and proteins. Electrodialysis (ED) is a process actually used for acid whey treatment, but scaling formation at the surface of the ion-exchange membrane is still a major problem. In this work, a combination of two new avenues of ED treatment has been studied. First, the integration of a nanofiltration (NF) membrane in an ED conventional stack was compared to a classical ED stack with an anion-exchange membrane in a standard current condition. Secondly, both configurations were tested in the overlimiting current condition to study the impact of electroconvective vortices on process efficiency. The combined effects of the NF membrane and overlimiting current condition led to a higher lactic acid recovery rate of acid whey (40%), while the conventional ED stack in the overlimiting current condition led to a higher demineralization (87% based on the total cation concentration). Those effects were related to the conductivity, pH, global resistance, and energy consumption of each treatment that are influenced by water splitting phenomenon, which was decreased in the overlimiting condition. View Full-Text
Keywords: acid whey; lactic acid recovery; demineralization; electrodialysis; energy consumption; nanofiltration membrane acid whey; lactic acid recovery; demineralization; electrodialysis; energy consumption; nanofiltration membrane
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Beaulieu, M.; Perreault, V.; Mikhaylin, S.; Bazinet, L. How Overlimiting Current Condition Influences Lactic Acid Recovery and Demineralization by Electrodialysis with Nanofiltration Membrane: Comparison with Conventional Electrodialysis. Membranes 2020, 10, 113.

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