Exploring the differences between forward osmosis and reverse osmosis fouling
A comparison of alginate fouling in forward osmosis (FO) with that in reverse osmosis (RO) was made. A key experimental finding, corroborated by membrane autopsies, was that FO is essentially more prone to fouling than RO, which is opposite to a common claim in the literature where deductions on fou...
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sg-ntu-dr.10356-1388262020-09-26T21:59:59Z Exploring the differences between forward osmosis and reverse osmosis fouling Siddiqui, Farrukh Arsalan She, Qianhong Fane, Anthony Gordon Field, Robert W. Singapore Membrane Technology Centre Engineering::Environmental engineering Forward Osmosis Reverse Osmosis A comparison of alginate fouling in forward osmosis (FO) with that in reverse osmosis (RO) was made. A key experimental finding, corroborated by membrane autopsies, was that FO is essentially more prone to fouling than RO, which is opposite to a common claim in the literature where deductions on fouling are often based solely on the water flux profiles. Our theoretical analysis shows that, due to a decrease in the intensity of internal concentration polarization (ICP), and thus an increase in the effective osmotic driving force during FO fouling tests, the similarity of experimental water flux profiles for FO and RO is in accordance with there being greater fouling in FO than RO. The specific foulant resistance for FO was also found to be greater than that for RO. Possible explanations are discussed and these include the influence of reverse solute diffusion from draw solution. Whilst this explanation regarding specific foulant resistance is dependent on the draw solution properties, the finding of greater overall foulant accumulation in FO is considered to be a general finding. Additionally, the present study did not find evidence that hydraulic pressure in RO plays a critical role in foulant layer compaction. Overall this study demonstrated that although FO has higher fouling propensity, it offers superior water flux stability against fouling. For certain practical applications this resilience may be important. NRF (Natl Research Foundation, S’pore) Accepted version 2020-05-13T04:20:15Z 2020-05-13T04:20:15Z 2018 Journal Article Siddiqui, F. A., She, Q., Fane, A. G., & Field, R. W. (2018). Exploring the differences between forward osmosis and reverse osmosis fouling. Journal of Membrane Science, 565, 241-253. doi:10.1016/j.memsci.2018.08.034 0376-7388 https://hdl.handle.net/10356/138826 10.1016/j.memsci.2018.08.034 2-s2.0-85052318696 565 241 253 en Journal of Membrane Science © 2018 Elsevier B.V. All rights reserved. This paper was published in Journal of Membrane Science and is made available with permission of Elsevier B.V. application/pdf |
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Engineering::Environmental engineering Forward Osmosis Reverse Osmosis Siddiqui, Farrukh Arsalan She, Qianhong Fane, Anthony Gordon Field, Robert W. Exploring the differences between forward osmosis and reverse osmosis fouling |
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A comparison of alginate fouling in forward osmosis (FO) with that in reverse osmosis (RO) was made. A key experimental finding, corroborated by membrane autopsies, was that FO is essentially more prone to fouling than RO, which is opposite to a common claim in the literature where deductions on fouling are often based solely on the water flux profiles. Our theoretical analysis shows that, due to a decrease in the intensity of internal concentration polarization (ICP), and thus an increase in the effective osmotic driving force during FO fouling tests, the similarity of experimental water flux profiles for FO and RO is in accordance with there being greater fouling in FO than RO. The specific foulant resistance for FO was also found to be greater than that for RO. Possible explanations are discussed and these include the influence of reverse solute diffusion from draw solution. Whilst this explanation regarding specific foulant resistance is dependent on the draw solution properties, the finding of greater overall foulant accumulation in FO is considered to be a general finding. Additionally, the present study did not find evidence that hydraulic pressure in RO plays a critical role in foulant layer compaction. Overall this study demonstrated that although FO has higher fouling propensity, it offers superior water flux stability against fouling. For certain practical applications this resilience may be important. |
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Singapore Membrane Technology Centre |
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Singapore Membrane Technology Centre Siddiqui, Farrukh Arsalan She, Qianhong Fane, Anthony Gordon Field, Robert W. |
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Article |
author |
Siddiqui, Farrukh Arsalan She, Qianhong Fane, Anthony Gordon Field, Robert W. |
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Siddiqui, Farrukh Arsalan |
title |
Exploring the differences between forward osmosis and reverse osmosis fouling |
title_short |
Exploring the differences between forward osmosis and reverse osmosis fouling |
title_full |
Exploring the differences between forward osmosis and reverse osmosis fouling |
title_fullStr |
Exploring the differences between forward osmosis and reverse osmosis fouling |
title_full_unstemmed |
Exploring the differences between forward osmosis and reverse osmosis fouling |
title_sort |
exploring the differences between forward osmosis and reverse osmosis fouling |
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2020 |
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https://hdl.handle.net/10356/138826 |
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1681057603761733632 |