MESSAI.iO

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This study investigates sulfonated sodium poly(ether ether ketone) (SPEEK) cation exchange membranes (CEMs) in microbial desalination cells (MDCs) to enhance power generation and salt removal. Both flat and micropatterned SPEEK CEMs were synthesized and tested with real Pacific Ocean seawater. Results demonstrated that SPEEK membranes achieved 78.6±2.0% salinity reduction and 235±7 mW/m² power generation, substantially outperforming commercial membranes. The non-patterned SPEEK CEM (S1) showed superior performance, suggesting that topographical patterning does not enhance MDC performance despite increasing interfacial area.

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What they did

System
MDC

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Abstract

Microbial desalination cell (MDC) is a bioelectrochemical system capable of oxidizing organics, generating electricity, while reducing the salinity content of brine streams. As it is designed, anion and cation exchange membranes play an important role on the selective removal of ions from the desalination chamber. In this work, sulfonated sodium (Na + ) poly(ether ether ketone) (SPEEK) cation exchange membranes (CEM) were tested in combination with quaternary ammonium chloride poly(2,6-dimethyl 1,4-phenylene oxide) (QAPPO) anion exchange membrane (AEM). Non-patterned and patterned (varying topographical features) CEMs were investigated and assessed in this work. The results were contrasted against a commercially available CEM. This work used real seawater from the Pacific Ocean in the desalination chamber. The results displayed a high desalination rate and power generation for all the membranes, with a maximum of 78.6±2.0% in salinity reduction and 235±7mWm -2 in power generation for the MDCs with the SPEEK CEM. Desalination rate and power generation achieved are higher with synthesized SPEEK membranes when compared with an available commercial CEM. An optimized combination of these types of membranes substantially improves the performances of MDC, making the system more suitable for real applications.

Keywords

DesalinationMembraneOxidizing agentIon exchangeEtherChemical engineering

Identifiers

DOI
10.1016/j.bioelechem.2018.02.004
PubMed
29459302
Journal
Bioelectrochemistry
Year
2018