In the present work, a salinity gradient power-reverse electrodialysis (SGP-RE) unit was tested for theproduction of electrical energy by exploiting the chemical potential of real brackish water and exhaustbrine from a solar pond. A cross-flow SGP-RE module (REDstack B.V.), equipped with AEM-80045 andCEM-80050 membranes specifically developed by Fujifilm Manufacturing Europe B.V. within theEU-funded project REAPOWER (“Reverse Electrodialysis Alternative Power Production”), was able togenerate a maximum power density (expressed in W m2 membrane pair – MP) of 3.04 W m2 MP whenoperated with pure NaCl aqueous solutions (0.1 M in low concentration compartment – LCC, 5 M inhigh concentration compartment – HCC) at 20 C and at a recirculation rate of 20 L h1. However, adrastic reduction to 1.13 W m2 (63%) was observed when feeding the SGP-RE unit with artificial multiionsolutions mimicking real brackish water and exhaust brine. Further experimental activity allowed toidentify Mg2+ ion as responsible for the significant increase in stack resistance and consequent depletionin SGP-RE performance. Therefore, specific softening treatments of the real solutions should beconsidered in order to maintain the process efficiency at practical level.

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

CURCIO, EFREM
;
2014

Abstract

In the present work, a salinity gradient power-reverse electrodialysis (SGP-RE) unit was tested for theproduction of electrical energy by exploiting the chemical potential of real brackish water and exhaustbrine from a solar pond. A cross-flow SGP-RE module (REDstack B.V.), equipped with AEM-80045 andCEM-80050 membranes specifically developed by Fujifilm Manufacturing Europe B.V. within theEU-funded project REAPOWER (“Reverse Electrodialysis Alternative Power Production”), was able togenerate a maximum power density (expressed in W m2 membrane pair – MP) of 3.04 W m2 MP whenoperated with pure NaCl aqueous solutions (0.1 M in low concentration compartment – LCC, 5 M inhigh concentration compartment – HCC) at 20 C and at a recirculation rate of 20 L h1. However, adrastic reduction to 1.13 W m2 (63%) was observed when feeding the SGP-RE unit with artificial multiionsolutions mimicking real brackish water and exhaust brine. Further experimental activity allowed toidentify Mg2+ ion as responsible for the significant increase in stack resistance and consequent depletionin SGP-RE performance. Therefore, specific softening treatments of the real solutions should beconsidered in order to maintain the process efficiency at practical level.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/138246
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