Electro-ultrafiltration of industrial enzyme solutions

Ann Dorrit Enevoldsen, Erik Børresen Hansen, Gunnar Eigil Jonsson

Research output: Contribution to journalJournal articleResearchpeer-review


To reduce the problems with fouling and concentration polarization during crossflow ultrafiltration of industrial enzyme solutions an electric field is applied across the membrane. The filtration performance during electro-ultrafiltration (EUF) has been tested with several enzymes. Results show that EUF is an effective method to filter high concentrated solutions at low crossfiow. The flux improved 3-7 times for enzymes with a significant surface charge at an electric field strength of 1600V/m compared to conventional UF. The greatest improvement is observed at high concentration. Not all enzymes can be filtered with EUF, mainly due to a low surface charge and impurities in the feed solution. Using a pulsed electric field did not improve the flux compared to a constant field. Gel electrophoresis experiments of the enzymes appear to be a useful method for estimating the influence of the electric field.
Original languageEnglish
JournalJournal of Membrane Science
Issue number1-2
Pages (from-to)28-37
Publication statusPublished - 2007


  • enzyme
  • membrane fouling
  • crossflow filtration
  • electrofiltration
  • electrophoresis
  • electrophoretic mobility
  • electric field


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