| As the rapid economic development in the world, results in an increase of energy demand and depletion of fossil energy, the development of high quality and reliable new clean energy and adjustment of energy structure systems in the world has been inevitable trend. Microbial fuel cell was regard as a kind of cleaning, new technique which using biomass as fuel, it can directly conver the chemical energy in the biomass to electrical energy, and has wide fuel source, resources, high conversion rate, no pollution and mild reaction condition. The MFC is a new direction of sustainable renewable new energy systems.Because of the materials for MFCs are expensive, the configuration of MFCs is uncertain and others. In this study, we designed a new and simple type of the air-cathode single chamber MFC, and the MFCs was taken as the research object, the artificial wastewater and glucose solution as fuels, anaerobic sludge from sewang treatment plat as strain, electricity production of the MFC and its influencing factors were studied in the intermittent operation conditions, and the electrochemically active bacteria in anode chamber was identified when the MFCs started successfully. In order to provide a feasible basis for the large-scale development and application of the MFC in the future.The results show that, the air-cathode single chamber MFC started in a relatively short period of time, and had good reproducibility, stable output voltage. The MFC objected output power density up to 1319mW·m-3, and corresponding to the battery internal resistance is 130Ω. The MFC reactor had higher removal ability for wastewater, the removal rate of COD was up to 93.6%, and the concentration of COD was to 60 mg/L when used the glucose solution (initial concentration of COD is 870mg/L) as fuel.Studies of influence factors by running MFC show that:(1) the specific surface area and porosity of anode material had the important role on electricity production. The best output performance could be obtained by running the MFC that the anode chamber filled with Φ 4 x 4mm graphite particles, the maximum output voltage was 0.415 V, the maximum output power density was 990.17 mW/m3; (2) The MFC had strong adaptability between 25℃ and 35℃, and the most suitable temperature was 35℃; (3) the output power density of MFC rose as the increase of initial concentration of glucose solutions, but not unlimited increased, and showed a "saturation"; We obtained the kinetic equations were fitted by using Monod equation and output power of MFC changed with the concentration of glucose solution,when the external circuit is 500Ω,800Ω,1000Ω; (4) In the last 4 times by adding glucose solution condition, pH of anode solution decreased from 6.92 to 5.05, and the output voltage reduced from 0.428V to 0.266V; (5) the cathode plate made of graphite materials by adding ferric sulfate had a catalytic effect. The maxmal output voltage of the MFC was 0.528V when the cathode plate content of ferric sulfate was 6%.After the MFC was started successfully, five different advantages electrogenic bacterias were isolated from sloution in the chamber. The Stenotrophomonas acidaminiphila shared 42.8%, became the main advantage electrogenic bacterias in anode chamber; The Pseudomonas veronii, Pseudomonas plecoglossicida, Pseudomonas taiwanesis, and Ochrobactrum tritici partial shared 14.3% respectively in anode chamber, they became the advantage electrogenic bacterias in anode chamber. They all belong to the Proteobacteria, and were firstly discovered producing electricity by glucose sloution. |
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