From 2014.igem.org
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Microbial Fuel Cells (MFCs) which can convert contaminants in wastewaters into energy is an ideal approach to solve both pollution problem and energy crisis. However, MFCs still have disadvantages such as hard to determine the contaminants concentrations which is a major drawback for MFCs applications.
In our study, we found that the electricity produced by MFCs was somewhat related to the substrates concentrations such as P-nitrophenol (PNP) in anode or Chromium (VI) in cathode. Therefore, we hypothesize that a) by using genetic engineered bacteria, the MFC’s electricity will be more stable and correlated with substrates concentrations. b) by monitoring MFC’s electricity, it will be possible to measure substrates concentrations.
In this study, we’ve designed a novel MFC system. For anode strain, we’ve cloned a PNP sensor sequence and a riboflavin into Escherichia coli. The recombinants is able to detect PNP and produce riboflavin to boost electrical generation when co-cultured with Shewanella oneidensis. In the cathode, gene codes chromate (VI) reductase Yief was cloned into E.coli. The stability of MFCs has been improved and the electricity generated to correlated with the substrates. Moreover, based on this correlation, we’ve designed a software which is able to monitor the contaminants concentrations in MFCs.
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