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Article

Modeling and Optimization of Membrane Process for Salinity Gradient Energy Production

Department of Civil, Environmental, Construction Engineering, Texas Tech University, Lubbock, TX 79409, USA
Academic Editor: Mingheng Li
Separations 2021, 8(5), 64; https://doi.org/10.3390/separations8050064
Received: 21 April 2021 / Revised: 5 May 2021 / Accepted: 6 May 2021 / Published: 12 May 2021
(This article belongs to the Special Issue Modeling, Simulation, and Optimization of Membrane Processes)
When hydraulic pressure was added on the feed side of the membrane in the otherwise conventional pressure retarded osmosis (PRO) process, the production rate of the salinity gradient energy could be significantly increased by manipulating the hydraulic pressures on both sides of the membrane. With hydraulic pressure added on the feed side of the membrane, much higher water flux could be obtained than that under the osmotic pressure of the same value. The osmotic pressure of the draw solution, instead of drawing water through the membrane, was mainly reserved to increase the hydraulic pressure of the permeate. In this way, orders of magnitude higher power density than that in the conventional PRO can be obtained with the same salinity gradient. At the optimal conditions, it was demonstrated that the energy production rates that were much higher than the economical breakeven point could be obtained from the pair of seawater and freshwater with the currently available semipermeable membranes. View Full-Text
Keywords: salinity gradient energy; pressure retarded osmosis; hydraulic pressure; semipermeable membrane; optimization salinity gradient energy; pressure retarded osmosis; hydraulic pressure; semipermeable membrane; optimization
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MDPI and ACS Style

Song, L. Modeling and Optimization of Membrane Process for Salinity Gradient Energy Production. Separations 2021, 8, 64. https://doi.org/10.3390/separations8050064

AMA Style

Song L. Modeling and Optimization of Membrane Process for Salinity Gradient Energy Production. Separations. 2021; 8(5):64. https://doi.org/10.3390/separations8050064

Chicago/Turabian Style

Song, Lianfa. 2021. "Modeling and Optimization of Membrane Process for Salinity Gradient Energy Production" Separations 8, no. 5: 64. https://doi.org/10.3390/separations8050064

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