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. 2021 Mar 29;11(4):246. doi: 10.3390/membranes11040246

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Timeline of the key developments of RO [16,17,18,19,20,21], forward osmosis (FO), and pressure-retarded osmosis (PRO) [22,23,24,25,26,27,28,29,30] processes.