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Issue 3, 2016
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Silica fouling in high salinity waters in reverse osmosis desalination (sodium–silica system)

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Abstract

Silica fouling patterns in a sodium–silica system and the effect of pH on residual dissolved silica concentrations are reported. The unique chemical affinity between sodium and silica (SO4) prevented silica scale deposition on the membrane surface during reverse osmosis (RO) desalination. It was found that high concentrations of sodium in solutions depressed silica solubility to 81–84 mg L−1 for a maximum NaCl salinity of 60–65 g L−1. Using a range of membrane examination techniques, it was found that no silica scale formed on the RO membrane surfaces from NaCl solutions free from cations such as Ca, Al and Fe. This was considered to be the result of sodium ions acting as a barrier between polymeric silica and the membrane surface.

Graphical abstract: Silica fouling in high salinity waters in reverse osmosis desalination (sodium–silica system)

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Article information


Submitted
06 Mar 2016
Accepted
07 Apr 2016
First published
11 Apr 2016

Environ. Sci.: Water Res. Technol., 2016,2, 539-548
Article type
Paper

Silica fouling in high salinity waters in reverse osmosis desalination (sodium–silica system)

L. Lunevich, P. Sanciolo, L. F. Dumée and S. R. Gray, Environ. Sci.: Water Res. Technol., 2016, 2, 539
DOI: 10.1039/C6EW00065G

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