Abstract
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 language | English |
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Pages (from-to) | 3716-3722 |
Number of pages | 7 |
Journal | Water Research |
Volume | 47 |
Issue number | 11 |
DOIs | |
State | Published - 1 Jul 2013 |
Externally published | Yes |
Keywords
- Anti-scalant
- Rotating cylinder
- Scale precipitation
- Surface control
- Transport control