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Silica fouling in coal seam gas water reverse osmosis desalination

Abstract

Silica fouling was studied in RO desalination of high salinity (30 – 60g/L as NaCl) coal seam gas (CSG) waters for a range of silica concentrations, pH conditions and dissolved aluminium concentrations. Silica fouling patterns and the effect of various residual dissolved aluminium concentrations on silicate scale formation were recorded. The permeate flux decline data collected during each RO experiment showed that the deposition of the foulant layer on the membrane surface formed much faster in higher salinity and higher silica concentration waters (~50mg/L) in the presence of elevated concentrations of dissolved aluminium (7 – 27.7 mg/L). It was found that the presence of elevated concentrations of the dissolved aluminium reduce silica solubility to as low as 60 – 48 mg/L, leading to rapid aluminium-silicate deposition on the RO membrane surface. A mechanism of aluminium silica formation for the specific test conditions is discussed.

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Publication details

The article was received on 21 Apr 2017, accepted on 29 May 2017 and first published on 07 Jun 2017


Article type: Paper
DOI: 10.1039/C7EW00128B
Citation: Environ. Sci.: Water Res. Technol., 2017, Accepted Manuscript
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    Silica fouling in coal seam gas water reverse osmosis desalination

    L. Lunevich, P. Sanciolo, N. Milne and S. Gray, Environ. Sci.: Water Res. Technol., 2017, Accepted Manuscript , DOI: 10.1039/C7EW00128B

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