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This study explores the use of Vigna mungo wash water in a microbial desalination cell (MDC) to generate power and desalinate water, achieving a high power density of 2720 ± 50 μW/m 2 .

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Representative microbial desalination cell — matched on the paper’s system type only, not its reactor or geometry.

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What they did

System
MDC

What worked

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Abstract

Abstract This study aims to improve the performance of microbial desalination cell (MDC) using Vigna mungo (Black gram) wash water, reported for the first time as an anolyte utilizing a graphite plate and carbon brush as the anode. Power generation was facilitated by the exoelectrogen, Shewanella putrefaciens MTCC 8104. Polarization studies revealed that the graphite plate MDC attained a high power density of 2720 ± 50 μW/m 2 compared to carbon brush for two electrode pairs. The COD removal and desalination efficiency were better for carbon brush MDC, achieving 58.17 ± 2% and 38.14 ± 2% removal, respectively. Power production can be enhanced by increasing the cathode's ability to accept the electrons, reducing the ageing of biofilm and promoting complete oxidation of the substrates. Upon improving its performance, MDC can act as a sustainable technology, collaborating with industries seeking solutions for wastewater treatment, energy generation and agricultural sectors on a large scale.

Key findings

  • Graphite plate MDC attained a high power density of 2720 ± 50 μW/m².
  • Carbon brush MDC achieved 58.17 ± 2% COD removal and 38.14 ± 2% desalination efficiency.
  • Power production can be enhanced by increasing the cathode's ability to accept electrons.

Keywords

DesalinationVignaAnodeWater desalinationPulp and paper industryEnvironmental engineering

Identifiers

DOI
10.1111/wej.12927
Journal
Water and Environment Journal
Year
2024