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Hydraulic energy generation for RO (reverse osmosis) from PRO (pressure retarded osmosis)

Tshuma, I., Cord-Ruwisch, R. and Ela, W. (2020) Hydraulic energy generation for RO (reverse osmosis) from PRO (pressure retarded osmosis). In: 4th International Conference on Green Energy and Applications (ICGEA) 2020, 7 - 9 March 2020, Singapore

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Although reverse osmosis (RO) is currently the most energy efficient, widely used, desalination technology, it still requires a great deal of energy to create the high pressure necessary to overcome the osmotic pressure of seawater. Pressure retarded osmosis (PRO), on the other hand, utilizes the salinity gradient between two solutions of different salt content to produce pressure, which can subsequently be used to generate electrical energy. The intended outcome of this study is a PRO-RO desalination system, where the PRO unit is directly hydraulically linked to a RO unit such that the pressure produced by PRO is transferred to RO to produce permeate. By utilizing the pressure produced in PRO to power RO, external energy inputs can be substituted. This is particularly significant in remote, off-grid, decentralized locations that have limited access to fresh water. The main objective of this paper is to introduce a RO driven by PRO technology and present ongoing work on a PRO stand-alone process.

Item Type: Conference Paper
Murdoch Affiliation(s): Engineering and Energy
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