Downstream processing of reverse osmosis brine: characterisation of potential scaling compounds

Zaman, Masuduz, Birkett, Greg, Pratt, Christopher, Stuart, Bruce and Pratt, Steven (2015) Downstream processing of reverse osmosis brine: characterisation of potential scaling compounds. Water Research, 80 227-234. doi:10.1016/j.watres.2015.05.004

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Author Zaman, Masuduz
Birkett, Greg
Pratt, Christopher
Stuart, Bruce
Pratt, Steven
Title Downstream processing of reverse osmosis brine: characterisation of potential scaling compounds
Journal name Water Research   Check publisher's open access policy
ISSN 1879-2448
0043-1354
Publication date 2015-09-01
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.watres.2015.05.004
Open Access Status File (Author Post-print)
Volume 80
Start page 227
End page 234
Total pages 8
Place of publication London, United Kingdom
Publisher I W A Publishing
Collection year 2016
Language eng
Abstract Reverse osmosis (RO) brine produced at a full-scale coal seam gas (CSG) water treatment facility was characterized with spectroscopic and other analytical techniques. A number of potential scalants including silica, calcium, magnesium, sulphates and carbonates, all of which were present in dissolved and non-dissolved forms, were characterized. The presence of spherical particles with a size range of 10-1000nm and aggregates of 1-10 microns was confirmed by transmission electron microscopy (TEM). Those particulates contained the following metals in decreasing order: K, Si, Sr, Ca, B, Ba, Mg, P, and S. Characterization showed that nearly one-third of the total silicon in the brine was present in the particulates. Further, analysis of the RO brine suggested supersaturation and precipitation of metal carbonates and sulphates during the RO process should take place and could be responsible for subsequently capturing silica in the solid phase. However, the precipitation of crystalline carbonates and sulphates are complex. X-ray diffraction analysis did not confirm the presence of common calcium carbonates or sulphates but instead showed the presence of a suite of complex minerals, to which amorphous silica and/or silica rich compounds could have adhered. A filtration study showed that majority of the siliceous particles were less than 220nm in size, but could still be potentially captured using a low molecular weight ultrafiltration membrane
Keyword Brine
Filtration
Reverse osmosis
Scaling compound
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2016 Collection
 
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