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Graphene/PVDF flat-sheet membrane for the treatment of RO brine from coal seam gas produced water by air gap membrane distillation

Authors
Woo, Yun ChulKim, YoungjinShim, Wang-GeunTijing, Leonard D.Yao, MinweiNghiem, Long D.Choi, June-SeokKim, Seung-HyunShon, Ho Kyong
Issue Date
1-9월-2016
Publisher
ELSEVIER SCIENCE BV
Keywords
Graphene/PVDF membrane; CSG produced water; RO brine; Air gap membrane distillation; Phase inversion
Citation
JOURNAL OF MEMBRANE SCIENCE, v.513, pp.74 - 84
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF MEMBRANE SCIENCE
Volume
513
Start Page
74
End Page
84
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/87554
DOI
10.1016/j.memsci.2016.04.014
ISSN
0376-7388
Abstract
Brine management of coal seam gas (CSG) produced water is a significant concern for the sustainable production of CSG in Australia. Membrane distillation (MD) has shown the potential to further reduce the volume of CSG reverse osmosis (RO) brine. However, despite its potential, the lack of appropriate MD membranes limits its industrial use. Therefore, this study was aimed on the fabrication of a robust membrane for the treatment of real RO brine from CSG produced water via an air gap MD (AGMD) process. Here, graphene/polyvinylidene fluoride (G/PVDF) membranes at various graphene loadings 0.1-2.0 wt% w.r.t. to PVDF) were prepared through a phase inversion method. Surface characterization revealed that all G/PVDF membranes exhibited favorable membrane properties having high porosity (> 78%), suitable mean pore size (< 0.11 mu m), and high liquid entry pressure (> 3.66 bar). AGMD test results (feed inlet: 60.0 +/- 1.5 degrees C; coolant inlet: 20.0 +/- 1.5 degrees C) for 24 h operation indicated a high water vapor flux and salt rejection of 20.5 L/m(2)h and 99.99%, respectively for the optimal graphene loading of 0.5 wt%, i.e., G/PVDF-0.5 membrane (compared to 11.6 L/m(2)h and 99.96% for neat PVDF membrane). Long-term AGMD operation of 10 days further revealed the robustness of G/PVDF membrane with superior performance compared to commercial PVDF membrane (85.3% final normalized flux/99.99% salt rejection against 51.4%/99.95% for commercial membrane). Incorporation of graphene has resulted to improved wetting resistance and more robust membrane that has the potential for the treatment of RO brine from CSG produced water via AGMD. (C) 2016 Elsevier B.V. All rights reserved.
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