The Research Of Production Electrical Characteristics About E.coli Microbial Fuel Cell Degrading Organic Fuel

At present, a large number of traditional fossil fuels was exploited such as coal and oil, It is important for everyone to face resource exhaustion. At the same time, mining and energy use brings the environment pollution aggravating. It is important way to solve the new energy of research and development. Microbial fuel cell technology (MFC) is a promising technology. In MFC, chemical energy from organic compounds can be directly converted into electrical energy by E.coli, company with an electric current to produce.In this paper, an indirect microbial fuel cell (MFC) was constructed by using E.coli as the biocatalyst, Paper as anode electrode, Pt as cathode electrode, methylene blue as the electron mediator, glucose and sodium acetate as the electron donor, potassium ferricyanide as the electron acceptor and K2HPO4 and KH2PO4 as buffer material.Firstly, accordding to the tame method, the performance of MFC achieve to the best, and the current density, power density, anode and cathode internal resistance was 8.75 mA/cm3,1.79 mW/cm3,43.6 Ω and 120 Ω, respectively, after the fifth tamed, and the anode carbon paper biological film after the fifth online domestication, the MFC output power at the highest.Secondly, on the basis of the investigation for the different layers of anode carbon paper, the experiment showed that when the carbon paper stack superposition of six layer, the volume of MFC reach maximum power of 0.811 mW/cm3.Lastly, this paper analyzed the influence factors of the performance of the E. coli MFC on the glucose system, system temperature, NaCl concentration and MB concentration, the experimental results show that: in the same concentration, employed the glucose and acetic acid sodium as the substrate, the production capacity of glucose was superior to the acetic acid sodium. And, when the glucose concentration was 0.0112 mol/L, the MFC volume reached a high power density of 1.213 mW/cm3. When the system temperature, NaCl concentration and MB concentration were 35℃,0.7 mmol/L and 0.15 mmol/L, respectively, the MFC performance reached at its best. In this experiment condition, the biological activity of glucose was metabolismed by the E. coli was best, and the mass transfer of charge was also easy. At the same time, the interbody of MB played a important role in the E.c oli cells and anode carbon paper between electrode mass transfer and the electronic transfer.