Rotating cylinder technique for assessing the effectiveness of anti-scalants

Irina Zaslavschi, Hilla Shemer, David Hasson*, Raphael Semiat

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


A novel technique for evaluating the relative inhibition effectiveness of different anti-scalants is presented. The technique is based on the ability of anti-scalants to modify the scale deposition mechanism from mass transfer control to surface control. A rotating cylinder system which is known to provide well controlled mass transfer conditions is used to determine the scaling rate of a supersaturated solution dosed with various feed concentrations of an anti-scalant. Mass transfer conditions were characterized by turbulent flow at hydrodynamically smooth surface. In the absence of an anti-scalant, scale deposition is mass transfer controlled and scaling rate increases with rotation speed. With sufficient anti-scalant dosage, precipitation is modified to surface control and rotation speed has no effect on the scale deposition rate. Determination of the critical anti-scalant dosage enabling surface controlled precipitation provides a sensitive technique for comparing the relative effectiveness of different anti-scalants.

Original languageEnglish
Pages (from-to)3716-3722
Number of pages7
JournalWater Research
Issue number11
StatePublished - 1 Jul 2013
Externally publishedYes


  • Anti-scalant
  • Rotating cylinder
  • Scale precipitation
  • Surface control
  • Transport control

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