Salinity-gradient power: Evaluation of pressure-retarded osmosis and reverse electrodialysis...

1.Title, Journal and Authors

Title: Salinity-gradient power: Evaluation of pressure-retarded osmosis and reverse electrodialysis

Journal: Journal of Membrane Science

Authors: Jan W. Post a,b, Joost Veerman b, Hubertus V.M. Hamelers a,, Gerrit J.W. Euverink b,

Sybrand J. Metzb, Kitty Nymeijer c, Cees J.N. Buisman a,b

aWageningen University, Sub-Department of Environmental Technology, P.O. Box 8129, 6700 EV Wageningen, The Netherlands

bWetsus, Centre for Sustainable Water Technology, P.O. Box 1113, 8900 CC Leeuwarden, The Netherlands

cUniversity of Twente, Faculty of Science and Technology, Membrane Technology Group, P.O. Box 217, 7500 AE Enschede, The Netherlands 



Salinity-gradient power is in the limelight. It generates the clean energy from mixing water streams with different salt concentrations. There are two big parts in salinity-gradient power energy generation. One is pressure-retarded osmosis (PRO). It the PRO process, the chemical potential transfers to hydraulic energy, then operate the generator. PRO process is efficient in the high salinity-gradient gap condition. The other generation method is reverse electrodialysis (RED). In this system, cation and anion makes electric potential difference on the stacked exchange membranes.


3. Application to research

The basic concept of PRO and RED is very similar. However, PRO have to undergo one more energy transfer process, which makes electricity with hydraulic energy. In the thermodynamics view, it has loss of energy by the resistance. RED process can generate the electricity without specific process. The membrane, which contains the high power density of PRO process and small resistance loss of RED process, can make sustainable and high efficiency electricity generation.


4. Contact

Chansik Park (Integrated Ph.D. program)

Environmental Systems Engineering Lab.
Department of Environmental Science & Engineering
Gwangju Institute Science and Technology
1 Oryong-dong Buk-gu Gwangju, 500-712, Korea

Phone : +82-62-715-2461
E-mail : 14pcs@gist.ac.kr

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