Evaluation of electrocoagulation for the pre-treatment of coal seam water

Millar, Graeme, Lin, Jack, Arshad, Aasma, & Couperthwaite, Sara J. (2014) Evaluation of electrocoagulation for the pre-treatment of coal seam water. Journal of Water Processing Engineering, 4, pp. 166-178.

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Abstract

This work explored the applicability of electrocoagulation (EC) using aluminium electrodes for the removal of contaminants which can scale and foul reverse osmosis membranes from a coal seam (CS) water sample, predominantly comprising sodium chloride, and sodium bicarbonate. In general, the removal efficiency of species responsible for scaling and fouling was enhanced by increasing the applied current density/voltage and contact times (30–60 s) in the EC chamber. High removal efficiencies of species potentially responsible for scale formation in reverse osmosis units such as calcium (100%), magnesium (87.9%), strontium (99.3%), barium (100%) and silicates (98.3%) were achieved. Boron was more difficult to eliminate (13.3%) and this was postulated to be due to the elevated solution pH. Similarly, fluoride removal from solution (44%) was also inhibited by the presence of hydroxide ions in the pH range 9–10. Analysis of produced flocs suggested the dominant presence of relatively amorphous boehmite (AlOOH), albeit the formation of Al(OH)3 was not ruled out as the drying process employed may have converted aluminium hydroxide to aluminium oxyhydroxide species. Evidence for adsorption of contaminants on floc surface sites was determined from FTIR studies. The quantity of aluminium released during the electrocoagulation process was higher than the Faradaic amount which suggested that the high salt concentrations in the coal seam water had chemically reacted with the aluminium electrodes.

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ID Code: 88783
Item Type: Journal Article
Refereed: Yes
Keywords: Coal seam gas; Coal bed methane; Produced water; Electrocoagulation; Water treatment
DOI: 10.1016/j.jwpe.2014.10.002
ISSN: 2214-7144
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 29 Oct 2015 05:02
Last Modified: 29 Oct 2015 05:02

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