Effect of reverse osmosis pre-processing of acid whey and electrodialysis current density on process performance
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Effect of reverse osmosis pre-processing of acid whey and electrodialysis current density on process performance. / Nielsen, Emilie N.; Gøtke, Mathias; Cordin, Ulysse; Skibsted, Leif H.; Velizarov, Svetlozar; Crespo, João G.; Ahrné, Lilia M.
In: Food and Bioproducts Processing, Vol. 140, 2023, p. 72-83.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Effect of reverse osmosis pre-processing of acid whey and electrodialysis current density on process performance
AU - Nielsen, Emilie N.
AU - Gøtke, Mathias
AU - Cordin, Ulysse
AU - Skibsted, Leif H.
AU - Velizarov, Svetlozar
AU - Crespo, João G.
AU - Ahrné, Lilia M.
N1 - Publisher Copyright: © 2023 The Authors
PY - 2023
Y1 - 2023
N2 - Acid whey (AW) is the main side-stream from acidified dairy products, known for its high contents of lactic acid and minerals. The present work investigates the effect of reverse osmosis (RO) pre-processing of AW (ROAW) and the current density during electrodialysis (ED) on the ED process performance. Firstly, the limiting current density of the ED system when treating AW and ROAW was determined. Then, the AW and ROAW have been demineralized and deacidified at under-limiting or over-limiting current density batch operating conditions. RO pre-processing of AW and current density strongly affect the demineralization rate and solutes mass transport across the membranes. Lactate transport can be rationalized by the weak acid dissociation mechanism, while water splitting played a minor role in the ED process performance. Among cations, calcium and magnesium were most affected by RO pre-processing, due to their high affinity to the cation exchange membranes. Lactose and galactose were found in small amounts in the concentrate solution, while no glucose was detected for most conditions even though the glucose content decreased in the diluates. The energy consumption was up to 2 fold higher for ROAW compared to AW
AB - Acid whey (AW) is the main side-stream from acidified dairy products, known for its high contents of lactic acid and minerals. The present work investigates the effect of reverse osmosis (RO) pre-processing of AW (ROAW) and the current density during electrodialysis (ED) on the ED process performance. Firstly, the limiting current density of the ED system when treating AW and ROAW was determined. Then, the AW and ROAW have been demineralized and deacidified at under-limiting or over-limiting current density batch operating conditions. RO pre-processing of AW and current density strongly affect the demineralization rate and solutes mass transport across the membranes. Lactate transport can be rationalized by the weak acid dissociation mechanism, while water splitting played a minor role in the ED process performance. Among cations, calcium and magnesium were most affected by RO pre-processing, due to their high affinity to the cation exchange membranes. Lactose and galactose were found in small amounts in the concentrate solution, while no glucose was detected for most conditions even though the glucose content decreased in the diluates. The energy consumption was up to 2 fold higher for ROAW compared to AW
KW - Acid whey
KW - Electrodialysis
KW - Lactate
KW - Minerals
KW - Separation efficiency
KW - Sugars
U2 - 10.1016/j.fbp.2023.05.002
DO - 10.1016/j.fbp.2023.05.002
M3 - Journal article
AN - SCOPUS:85159294840
VL - 140
SP - 72
EP - 83
JO - Food and Bioproducts Processing
JF - Food and Bioproducts Processing
SN - 0960-3085
ER -
ID: 357051521