Application of bipolar membrane electrodialysis for acidification of skim milk. A comprehensive study on process performance and effects on ion-exchange membranes

Arthur Merkel, Gregor Rudolph, Shyam Suwal, Frank Lipnizki, Søren K. Lillevang, Lilia Ahrné

Research output: Contribution to journalArticlepeer-review

Abstract

Bipolar membrane electrodialysis (EDBM) can be applied for the electro-acidification of skim milk (SM) using a water-splitting effect. A new method of SM acidification gives opportunities and perspectives to the development of alternative and novel products in the dairy industry. The present study assessed the effect of temperatures from 5 °C to 30 °C of EDBM on the electro-acidification of SM in terms of the mineral composition of the side streams. The mechanisms of ion transport during electro-acidification by bipolar membranes (BMs) coupled with cation-exchange membranes (CMs) were investigated. The results showed that the pH of the SM was decreased by ∼14.3% through the proton ions generated due to a water-splitting reaction in the bipolar interface region. Since the BMs and CMs are suspected to change their properties at different temperatures in the high protein solution, their properties and characteristics were investigated. The EDBM performance parameters were calculated. Furthermore, performance efficiency coefficients of the EDBM process as mass flux (J), capacity (CF), specific energy consumption (E) and the current efficiency (η) were calculated.

Original languageEnglish
Article number122429
JournalJournal of Membrane Science
Volume694
DOIs
Publication statusPublished - 2024 Feb

Subject classification (UKÄ)

  • Energy Engineering

Free keywords

  • Bipolar membrane electrodialysis
  • Calcium
  • Electro-acidification
  • Fouling
  • mCT method
  • Skim milk

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