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A wild type Bacillus cereus was used as a biocatalyst in a microbial fuel cell (MFC) for the first time, achieving a maximum power density of 3.88 W/m³ using palm oil mill effluent as fuel.

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What they did

System
MFC

What worked

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Abstract

Microbial fuel cell (MFC) is a bioelectrochemical system that uses bacteria as biocatalyst to oxidize organic substrates as well as release electrons, which can be harvested in an external circuit to produce electrical energy. In this study, a proteolytic biocatalyst Bacillus cereus (B. cereus) has been employed for the first time in a microbial fuel cell (MFC). The wild type pure culture was isolated from municipal wastewater and identified using Biolog Gen III analysis. The MFCs were fueled with palm oil mill effluent (POME) and attained the maximum power density of about 3.88 W/m³. The electrochemical behavior of MFC operated by B. cereus was evaluated using polarization curve, electrochemical impedance spectroscopy (EIS) and cyclic voltammetery (CV) analysis. B. Cereus excreated electron shuttling compound which significantly reduced the anode charge transfer resistance (52.95%). The FESEM result shows that B. Cereus has the capability of effective biofilm formation. These results revealed the electrocatalytic potentiality of B. cereus and which makes it a promising candidate to be used in MFCs. Therfore, this biocatlyst can be used to generate electricity through the wastewater valorization.

Key findings

  • B. cereus excreated electron shuttling compound, reducing anode charge transfer resistance by 52.95%
  • B. cereus formed effective biofilms, as shown by FESEM results
  • B. cereus demonstrated electrocatalytic potentiality, making it a promising candidate for MFCs

Keywords

Microbial fuel cellBacillus cereusCereusDielectric spectroscopyWastewaterPulp and paper industry

Identifiers

DOI
10.31436/iiumej.v18i2.801
Journal
IIUM Engineering Journal
Year
2017