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This study investigates the simultaneous removal of azo dye and bioelectricity production in a microbial fuel cell at sulfate-reducing conditions, achieving 96% COD removal and 24 W/m² power density.

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What they did

System
MFC
Substrate
pure compound

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Abstract

The main aim of this study is to investigate the simultaneous azo dye removal and bioelectricity production at sulfate reducing conditions in continuously-fed dual-chamber microbial fuel cell (MFC). Initially, optimization of sulfate reduction was performed at different sulfate concentrations (100-900 mg/L) and the constant COD of 1000 mg/L, corresponding to COD/sulfate ratio of 1.11-10, and varying HRT of 12-48h. Optimum COD/sulfate ratio and HRT was found 1.66 and 36h, respectively, corresponding to 96% COD removal, 44% sulfate removal and yielded about 24 W/m² power density. Further, MFC was fed with azo dye containing (50-1000 mg/L) simulated wastewater to evaluate dye removal performance of sulfate reducing bacteria. Addition of azo dye slightly enhanced the power production to 26 W/m², the highest value obtained during our study, compared to azo dye lacking study periods. Sulfate and COD removals were adversely affected at azo dye concentrations over 300 mg/L and 150 mg/L, respectively. Additionally, color removal performance of MFC was excellent however, chemical azo dye reduction out-competed with enzymatic reduction at high azo dye levels (>500 mg/L) leading to a poor sulfate (<15%) and COD (<45%) removal and recovery of azo dye reduction efficiency to 91%.

Key findings

  • Optimum COD/sulfate ratio and HRT was found to be 1.66 and 36h, respectively.
  • Addition of azo dye slightly enhanced power production to 26 W/m².
  • Sulfate and COD removals were adversely affected at azo dye concentrations over 300 mg/L and 150 mg/L, respectively.

Keywords

SulfateMicrobial fuel cellWastewaterNuclear chemistryChemical oxygen demandSulfate-reducing bacteria

Identifiers

DOI
10.30955/gnj.002926
Journal
Global NEST Journal
Year
2019