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A co-culture of Shewanella oneidensis MR-1 and Klebsiella pneumonia J2B in a microbial fuel cell (MFC) successfully metabolized glycerol and produced electricity, outperforming a single species inoculated counterpart.

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What they did

System
MFC

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Abstract

Abstract Glycerol is an attractive feedstock for bioenergy and bioconversion processes but its use in microbial fuel cells (MFCs) for electrical energy recovery has not been investigated extensively. This study compared the glycerol uptake and electricity generation of a co-culture of Shewanella oneidensis MR-1 and Klebsiella pneumonia J2B in a MFC with that of a single species inoculated counterpart. Glycerol was metabolized successfully in the co-culture MFC (MFC-J&M) with simultaneous electricity production but it was not utilized in the MR-1 only MFC (MFC-M). A current density of 10 mA/m² was obtained while acidic byproducts (lactate and acetate) were consumed in the co-culture MFC, whereas they are accumulated in the J2B-only MFC (MFC-J). MR-1 was distributed mainly on the electrode in MFC-J&M, whereas most of the J2B was observed in the suspension in the MFC-J reactor, indicating that the co-culture of both strains provides an ecological driving force for glycerol utilization using the electrode as an electron acceptor. This suggests that a co-culture MFC can be applied to electrical energy recovery from glycerol, which was previously known as a refractory substrate in a bioelectrochemical system.

Key findings

  • Glycerol was metabolized successfully in the co-culture MFC with simultaneous electricity production.
  • A current density of 10 mA/m² was obtained in the co-culture MFC.
  • Acidic byproducts (lactate and acetate) were consumed in the co-culture MFC, whereas they accumulated in the J2B-only MFC.

Keywords

Microbial fuel cellShewanella oneidensisGlycerolBioconversionMicrobial consortiumBioenergy

Identifiers

DOI
10.1007/s10295-016-1807-x
Journal
Journal of Industrial Microbiology and Biotechnology
Year
2016