| 英文摘要 |
The microbial fuel cell (MFC) is a new type of green technology, combining pollution treatment and renewable energy. In aMFC system, the energy released from the degraation of organic contaminants is harnessed as electricity. One can increase theMFC's power production efficiency by using oxygen, which has a high oxidation-reduction potential, as the system's terminalelectron acceptor. In our present study, bacteria cultured under microaerobic conditions to decompose BTEX (benzene, toluene,ethybenzene, and xylene) were introduced into the anode chamber of a cube-type MFC. Toluene was added to the anode chamber,and the subsequent biodegradation of toluene by bacteria released both electrons and protons, which then migrated to the cathode(electrons via the wire, and protons through the proton exchange membrane) and reacted with the oxygen produced by themicroalgae Spirulina via photosynthesis to form water. Our experimental results show that a sufficient concentration of dissolvedoxygen (DO) must be maintained within the cathode in order for the MFC system to generate electricity. Furthermore, we foundthat when Spirulina was added to the cathode, DO levels stayed high enough to sustain continuous toluene degradation and powergeneration. We conclude from these results that the microalgae Spirulina is suitable as an oxygen source in the MFC cathode withits ability to maintain DO concentrations, thus stabilizing the MFC's power output and extending the system's effective lifespan. |
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