Critical flux detection in a silica scaling RO system

Dmitry Lisitsin, David Hasson*, Raphael Semiat

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


Desalination of brackish water containing silica at high recovery levels leads to a rapid flux decline, due to the precipitation of a colloidal solution consisting of polymerized silica nano-particles. The critical flux (CF) phenomenon postulates that there is a certain permeate flux level below which the rate of flux decrease due to membrane fouling becomes negligible. The aim of this paper was to develop a simple technique for detecting the existence of a critical flux threshold limit under conditions at which the membrane surface is exposed to a constant precipitation potential. A series of experiments was carried out in a silica scaling tubular RO system. Experimental conditions were controlled such that the dissolved silica content on the membrane was held at the same supersaturation ratio level of 2.1-2.2 while varying the initial permeation flux value over the range of 17-45 l/h m2. The rate of flux decline was found to remain constant, irrespective of the permeate flux level examined.

Original languageEnglish
Pages (from-to)311-318
Number of pages8
Issue number1-3
StatePublished - 30 Dec 2005
Externally publishedYes


  • Critical flux
  • Permeability
  • Reverse osmosis
  • Silica
  • Supersaturation

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