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Issue 80, 2014
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Potential of brackish water and brine for energy generation by salinity gradient power-reverse electrodialysis (SGP-RE)

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Abstract

In the present work, a salinity gradient power-reverse electrodialysis (SGP-RE) unit was tested for the production of electrical energy by exploiting the chemical potential of real brackish water and exhaust brine from a solar pond. A cross-flow SGP-RE module (REDstack B.V.), equipped with AEM-80045 and CEM-80050 membranes specifically developed by Fujifilm Manufacturing Europe B.V. within the EU-funded project REAPOWER (“Reverse Electrodialysis Alternative Power Production”), was able to generate a maximum power density (expressed in W m−2 membrane pair – MP) of 3.04 W m−2 MP when operated with pure NaCl aqueous solutions (0.1 M in low concentration compartment – LCC, 5 M in high concentration compartment – HCC) at 20 °C and at a recirculation rate of 20 L h−1. However, a drastic reduction to 1.13 W m−2 (−63%) was observed when feeding the SGP-RE unit with artificial multi-ion solutions mimicking real brackish water and exhaust brine. Further experimental activity allowed to identify Mg2+ ion as responsible for the significant increase in stack resistance and consequent depletion in SGP-RE performance. Therefore, specific softening treatments of the real solutions should be considered in order to maintain the process efficiency at practical level.

Graphical abstract: Potential of brackish water and brine for energy generation by salinity gradient power-reverse electrodialysis (SGP-RE)

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Article information


Submitted
19 Jun 2014
Accepted
13 Aug 2014
First published
13 Aug 2014

This article is Open Access

RSC Adv., 2014,4, 42617-42623
Article type
Paper
Author version available

Potential of brackish water and brine for energy generation by salinity gradient power-reverse electrodialysis (SGP-RE)

R. A. Tufa, E. Curcio, W. van Baak, J. Veerman, S. Grasman, E. Fontananova and G. Di Profio, RSC Adv., 2014, 4, 42617
DOI: 10.1039/C4RA05968A

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