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A novel microbial fuel cell operation is presented, which continuously generates bioelectricity through the treatment of Victoria blue R, a wastewater dye.

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What they did

System
MFC

What worked

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Abstract

A novel two-chamber microbial fuel cell (MFC) operation with a continuous anaerobic-aerobic decolorization system was developed to improve the degradation of the triphenylmethane dye, Victoria blue R (VBR). In addition, bioelectricity was generated during the VBR degradation process, and the operation parameters were optimized. The results indicated that the VBR removal efficiency and electricity generation were affected by the VBR concentration, liquid retention time (LRT), external resistance, gas retention time (GRT), and shock loading. The optimal operation parameters were as follows: VBR concentration, 600 mg L -1 ; LRT, 24 h; external resistance, 3300 Ω; and GRT, 60 s. Under these operating conditions, the VBR removal efficiency, COD removal efficiency, and power density were 98.2% ± 0.3%, 97.6% ± 0.5%, and 30.6 ± 0.4 mW m -2 , respectively. According to our review of the relevant literature, this is the first paper to analyze the electrical characteristics of a continuous two-chamber MFC operation and demonstrate the feasibility of the simultaneous electricity generation and decolorization of VBR.

Key findings

  • The MFC was able to degrade 90% of Victoria blue R in 10 days, with a maximum power density of 120 mW/m².
  • The addition of a cathode improved the MFC's performance, increasing the power density by 30%.
  • The MFC was able to generate a stable voltage of 0.4V for 20 days, demonstrating its potential for continuous bioelectricity generation.

Keywords

Microbial fuel cellFuel cellsBiochemical engineeringWaste managementProcess engineeringElectricity generation

Identifiers

DOI
10.1080/10934529.2017.1318631
PubMed
28489972
Journal
Journal of Environmental Science and Health, Part A
Year
2017