Experimental correlations of pH and ionic strength effects on the colloidal fouling potential of silica nanoparticles in crossflow ultrafiltration

Gurdev Singh, Lianfa Song

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Colloidal fouling is a persistent problem in many membrane processes. In this paper the influence of pH and ionic strength on colloidal fouling was determined under controlled ultrafiltration experiments. The effect of water chemistry can significantly exacerbate colloidal fouling. For example, it was found that by adjusting feed water chemistry from pH 9 to ionic strength = 0.003 M to pH 2 and ionic strength = 0.15 M with all other conditions kept constant increased fouling by approximately 430%. Experimental data suggested that the colloidal fouling potential was linearly related to the zeta potential (ζ) of the colloids in the feed water and the natural logarithm of feed water ionic strength or the colloidal double layer thickness (1/κ). These findings were especially significant because it linked fundamental electrokinetic or feed water properties directly to colloidal fouling in membranes.

Original languageEnglish
Pages (from-to)112-118
Number of pages7
JournalJournal of Membrane Science
Volume303
Issue number1-2
DOIs
StatePublished - Oct 15 2007

Keywords

  • Colloid
  • Fouling
  • Ionic strength
  • Nanoparticle
  • Water chemistry
  • Zeta potential
  • pH

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