Enhanced water recovery in the coal seam gas industry using a dual reverse osmosis system
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Description
Mining of brines produced in the coal seam gas industry for water and salts is of major concern globally. This study focussed on the use of a dual stage reverse osmosis system to achieve high water recovery rates. It was our hypothesis that an intermediate nanofiltration stage was required to stabilize the performance of the second reverse osmosis stage. The second stage RO membrane was found to be fouled by silica and aluminosilicates when used with any intermediate brine treatment. Theoretical predictions using PHREEQC software supported the experimental outcomes in terms of identifying species with high scaling potential. Coagulation of the coal seam brine using aluminium chlorohydrate was found to remove up to 70.5 % of dissolved silica and thus this method may be useful for prevention of fouling of downstream membranes. ROSA software was also employed to enable selection of possible nanofiltration membranes to treat the coal seam brine sample. Tighter membranes were found to exhibit significantly higher rejection of ions responsible for scale formation during brine concentration operations. Albeit, the flux rates were less than the looser membrane types. A pressure of 20 bar was suggested to be practical for the nanofiltration stage as the flux rate more than doubled from the flux estimated at 15 bar. An intermediate nanofiltration stage perhaps combined with a coagulation step is recommended for use in a dual stage RO system to concentrate coal seam brines.
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ID Code: | 104130 | ||||||
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Item Type: | Contribution to Journal (Journal Article) | ||||||
Refereed: | Yes | ||||||
ORCID iD: |
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Measurements or Duration: | 15 pages | ||||||
Keywords: | coal bed methane, coal seam gas, membrane, reverse osmosis, water | ||||||
DOI: | 10.1039/C6EW00266H | ||||||
ISSN: | 2053-1419 | ||||||
Pure ID: | 33205228 | ||||||
Divisions: | Past > Institutes > Institute for Future Environments Past > QUT Faculties & Divisions > Science & Engineering Faculty Past > Schools > School of Chemistry, Physics & Mechanical Engineering |
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Copyright Owner: | Consult author(s) regarding copyright matters | ||||||
Copyright Statement: | This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au | ||||||
Deposited On: | 06 Mar 2017 00:51 | ||||||
Last Modified: | 08 Aug 2024 08:12 |
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