Effect of different aqueous solutions of pure salts and salt mixtures in reverse electrodialysis systems for closed-loop applications

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13 Citazioni (Scopus)

Abstract

Reverse Electrodialysis (RED) in a closed-loop arrangement is a viable way to convert low-grade heat intoelectric power. The present work experimentally investigates the use of pure salt- and equimolar two salts-watersolutions as feeds in a lab-scale RED unit. RED performances were analysed in terms of Open Circuit Voltage(OCV), stack resistance and corrected power density. The pure salts and the mixtures employed were chosen viaa computational analysis. Effect of feed solution velocity and concentration was investigated. Results concerningthe pure salt-water experiments show that NH4Cl is the most performing salt in the concentration range probed,while higher power density values are expected with the use of LiCl at larger concentrations. As regards the saltbinary mixtures, in some cases, the measured stack electrical resistance was found lower than both the twovalues measured for the corresponding pure salts, thus resulting into higher power density values for the mixtures.This surprising experimental evidence suggests that it is possible to increase the power produced by aconventional RED unit by adding an equivalent molar quantity of another suitable salt. Finally, among themixtures tested, the NH4Cl-LiCl mixture appears as the most promising, thanks to the combination of the favorableproperties of these two salts.
Lingua originaleEnglish
pagine (da-a)315-325
Numero di pagine11
RivistaJournal of Membrane Science
Volume551
Stato di pubblicazionePublished - 2018

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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