Effects of feed composition on the fouling on cation-exchange membranes desalinating polymer-flooding produced water

P.A. Sosa-Fernandez, S.J. Miedema, H. Bruning*, F.A.M. Leermakers, J.W. Post, H.H.M. Rijnaarts

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Hypothesis: Cation exchange membranes (CEMs) are subject to fouling when utilized to desalinate wastewater from the oil and gas industry, hampering their performance. The kind and extent of the fouling are most likely dependent on the composition of the stream, which in practical applications can vary significantly. Experiments: Fouling experiments were performed on commercial cation exchange membranes, which were used in electrodialysis runs to desalinate solutions of varying composition. The variations included ionic strength, type of ions, amount of viscosifying polyelectrolyte (partially hydrolyzed polyacrylamide), presence of crude oil, and surfactants. Performance parameters, like electric potential and pH, were monitored during the runs, after which the membranes were recovered and analyzed. Findings: Fouling was detected on most CEMs and occurred mainly in the presence of the viscosifying polyelectrolyte. Under normal pH conditions (pH ~ 8), the polyelectrolyte fouled the concentrate side of the CEMs, as expected due to electrophoresis. However, by applying a current in the opposite direction, the polyelectrolyte layer could be removed. Precipitation occurred mostly on the opposite side of the membrane, with different morphology depending on the feed composition.

Original languageEnglish
Pages (from-to)634-646
JournalJournal of Colloid and Interface Science
Volume584
Early online date26 Oct 2020
DOIs
Publication statusE-pub ahead of print - 26 Oct 2020

Keywords

  • Cation-exchange membrane
  • Crude oil
  • Electrodialysis
  • Gel layer
  • Membrane fouling
  • Partially hydrolyzed polyacrylamide
  • Polymer-flooding produced water

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