RO-PRO desalination: An integrated low-energy approach to seawater desalination

Jeri L. Prante, Jeffrey A. Ruskowitz, Amy E. Childress and Andrea Achilli

Applied Energy, 2014, vol. 120, issue C, 104-114

Abstract: Although reverse osmosis (RO) is currently the most energy efficient desalination technology, it still requires a great deal of energy to create the high pressures necessary to desalinate seawater. An opposite process of RO, called pressure retarded osmosis (PRO), utilizes the salinity gradient between a relatively fresh impaired water source and seawater to produce pressure and hence, energy. In this paper, PRO is evaluated in conjunction with RO, in a system called RO-PRO desalination, to reduce the energy requirement of seawater RO desalination. RO-PRO specific energy consumption was modeled using RO conditions at the thermodynamic restriction and a newly developed module-based PRO model. Using a well-characterized cellulose triacetate (CTA) membrane, the minimum net specific energy consumption of the system was found to be approximately 40% lower than state-of-the-art seawater RO. A sensitivity analysis was performed to determine the effects of membrane characteristics on the specific energy production of the PRO process in the RO-PRO system. The sensitivity analysis showed that the minimum specific energy consumption using virtual membranes is approximately 1.0kWh per m3 of RO permeate at 50% RO recovery and that a maximum power density of approximately 10W/m2 could be achieved.

Keywords: Pressure retarded osmosis; Reverse osmosis; Salinity gradient; Desalination (search for similar items in EconPapers)
Date: 2014
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Citations: View citations in EconPapers (34)

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DOI: 10.1016/j.apenergy.2014.01.013

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