Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/138826
Title: Exploring the differences between forward osmosis and reverse osmosis fouling
Authors: Siddiqui, Farrukh Arsalan
She, Qianhong
Fane, Anthony Gordon
Field, Robert W.
Keywords: Engineering::Environmental engineering
Issue Date: 2018
Source: 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
Journal: Journal of Membrane Science
Abstract: 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.
URI: https://hdl.handle.net/10356/138826
ISSN: 0376-7388
DOI: 10.1016/j.memsci.2018.08.034
Rights: © 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.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:NEWRI Journal Articles

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