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Silica fouling in high salinity waters in reverse osmosis desalination (sodium-silica system)
journal contribution
posted on 2016-01-01, 00:00 authored by L Lunevich, P Sanciolo, Ludovic Dumee, S R GraySilica 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.
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Journal
Environmental science : water research & technologyVolume
2Issue
3Pagination
539 - 548Publisher
Royal Society of ChemistryLocation
Cambridge, Eng.Publisher DOI
ISSN
2053-1400Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2016, Royal Society of ChemistryUsage metrics
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