On the understanding and feasibility of “Breakthrough” Osmosis

Wu, Jun Jie; Field, Robert W.

Abstract

Osmosis is the movement of solvent across a permselective membrane induced by a solute-concentration gradient. Now in ‘Forward Osmosis’ it is empirically observed that the diffusion of the solute is counter to that of the solvent i.e. there is so-called “reverse salt diffusion”. However it has been recently suggested, in a theoretical paper, that if allowance is made for minor deviations from ideal semi-permeability then operation in an overlooked mode of “breakthrough” osmosis would be possible and importantly it would yield relatively large rates of osmosis. A consequential prediction was that in “breakthrough mode”, Pressure-Retarded Osmosis (PRO) would generate very high power densities exceeding those in the conventional mode by one order of magnitude. The practicality of this suggestion was explored and necessarily questions were then raised regarding the foundation of the Spiegler-Kedem-Katchalsky model.

Citation

Wu, J. J., & Field, R. W. (2019). On the understanding and feasibility of “Breakthrough” Osmosis. Scientific Reports, 9(1), Article 16464. https://doi.org/10.1038/s41598-019-53417-6

• Journal Article Type: Article
• Online Publication Date: Nov 11, 2019
• Publication Date: Nov 11, 2019
• Deposit Date: Nov 20, 2019
• Publicly Available Date: Nov 20, 2019
• Journal: Scientific Reports
• Electronic ISSN: 2045-2322
• Publisher: Nature Research
• Peer Reviewed: Peer Reviewed
• Volume: 9
• Issue: 1
• Article Number: 16464
• DOI: https://doi.org/10.1038/s41598-019-53417-6
• Public URL: https://durham-repository.worktribe.com/output/1276899