| Microbial fuel cell (MFC) is a device directly converting microbial metabolic energy into electricity with the microbial catalysts, which has the advantages of abundant fuel resource,mild reaction condition and high efficiency.So,the development of MFC in the fields of environmental protection and biomass energy will be greatly attractive. Although it is still in experimental stage, the study of factors affecting the performance of MFC provides a significant guidance for practical application.In the study,constructed a two-chambered MFC based on the mechanism of output and electron transfer processes.The experimental system test-bed was established,to research the performance of MFC through the effect of electricigens, anodic characters,operation conditions and so on.Then analyzed and optimized the performances and characters exhibited by MFC systems. Correspondingly, the thesis is divided into six chapters:Chapter 1: concerned with the development and research background of the MFC,recited its classify and characters, and introduced the meaning and content of the research.Chapter 2: designed the experimental system of microbial fuel cell with double-chamber. Made the project of experiment and constructed the system based on the mechanism of output and electron transfer processes.Chapter 3: chose the electricigens and researched on the power generation performance.Used glucose as fuel in microbial fuel cell to harvest electricity through the biocatalysis of Saccharomyces. It is proved that using Saccharomyces as electricigens is feasible and it is MFC with electron mediator. It also find that the microbe of 2.39 and Y20 are well provided with electrochemical activity.Furthermore,the performance of MFC is related to these adsorptive microorganism not the suspended microbe. The microorganism may undergo a Darwin-type of natural selection process in electrochemical environments and the bioelectrocatalytic activity of Saccharomyces toward glucose oxidation can be significantly improved by using electrochemical microbe.Chapter 4: studied the influence of electrode on electricity generation of MFC. For the first time tried to use the metal which is good at electric capability as anode of MFC,such as copper, aluminium, iron. Some factors of electrode that may affect the performance of the MFC were investigated. which were electrode material, the surface roughness, superficies and the electrode space.The results indicate that ,the performance of MFC which used iron electrode is best, with the maximum power density of 193 mW·m-2 ;and increase in the effective reaction surface of anode can enhance the power output,as well as increasing the anode surface roughness; the change of cathode superficies has little effect on the power generation of the MFC as it reaches 25cm-2; and the best distance of electron is 1～3cm.Chapter 5:research on the effecting of operation conditions on the performance of MFC.Studied the MFC output by the change which were, the consistence of mediators or fuel, inner stirring of the two chambers, superficies of exchange membrane, pH, temperature and so on. The result showed that the MFC output altered a lot by the change of operation parameters. Based on these, analyzed the optimization of MFC.At last, the sum up of the research content and the achievements of the thesis are mentioned, the directions for further working aims also pointed out.
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