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The study investigates the effects of varying substrate concentrations on the performance and microbial community in a microbial fuel cell using swine wastewater, finding a positive correlation between concentration and output voltage and COD removal rate.

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What they did

System
MFC

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Abstract

The variation of substrate concentration in anode chamber directly affects the power generation efficiency and decontamination performance of microbial fuel cell (MFC). In this study, three concentrations of swine wastewater with 800 mg/L, 1600 mg/L and 2500 mg/L were selected as substrates, and the performance of MFC and response characteristics of anode microbial community were investigated. The results show that the concentration of a selected substrate is positively correlated with the output voltage of MFC and chemical oxygen demand (COD) removal rate. The microbial community diversity in the anode chamber and the performance of battery can be significantly affected when concentration changes in different ways, which helps to selectively cultivate the adaptable dominant bacteria to enhance the stability and decontamination performance of MFC. The community structure of anodic biofilm is mainly composed of Proteobacteria, Bacteroidetes, Firmicutes, Chloroflexi and Spirochaetae. These findings are meaningful to improve the treatment effects of swine wastewater and can help to find out the mechanism of varying concentration that influences the production of microorganisms in MFC.

Key findings

  • The concentration of substrate is positively correlated with the output voltage of MFC and COD removal rate.
  • The microbial community diversity in the anode chamber and the performance of battery can be significantly affected by concentration changes.
  • The community structure of anodic biofilm is mainly composed of Proteobacteria, Bacteroidetes, Firmicutes, Chloroflexi and Spirochaetae.

Keywords

Microbial fuel cellAnodeMicrobial population biologyChemical oxygen demandFirmicutesBacteroidetes

Identifiers

DOI
10.3390/en13092231
Journal
Energies
Year
2020