Research Of The Effects Of Operation Factors On Microbial Fuel Cells

In recent years, with the development of social economy, the energy crisis, the crisis of water resources and the problems of water pollution become increasingly serious. It is a great challenge for the governments and scientific community that how to solve the contaminated water, and through the crisis. As a new sewage treatment technology, microbial fuel cells can change the chemical energy of the organic pollutants in wastewater into electrical energy directly. It can treatment the sewage and generate electricity by the same time. It has the raw widely material, the moderate reaction condition, and friendly environment. MFC can relieve the energy, the water crisis and the water pollution at the same time, has important research value and significance.Microbial fuel cell has a broad market prospects, but the low sewage treatment effect and the capacity of the battery limit the practical application. How to improve the output electricity of the MFC and anolyte degradation efficiency of pollutants are the focus in the study of the MFC. On the basis of the existing research results, and combined with the characteristics of the economic and technical feasibility in practical application, designing a direct type double chamber microbial fuel cells. Glucose was used to the anolyte of the MFC, and CuSO4 was used the cathode liquid. It studied that the effect on the performance of MFC by the temperature, pH and the stirring speed.First of all, at the natural environment, it studied the effect on the performance of MFC by the concentration of CuSO4 solution. It shows that when the concentration of CUSO4 is 5g/L, the COD removal efficiency and output voltage is higher than lg/L. And the electron acceptor (Cu2+) is enough and can meet the needs of the experiment. So the concentration of 5g/L of the CuSO4 solution be used the MFC eventually cathode liquid.Secondly, in a single control under the condition of temperature, pH and stirring speed, and examines the MFC pollutants removal efficiency and production capacity of the battery. Results show that the operating temperature 30℃ and anolyte pH value of 6 is the optimal operation of the MFC system, and the pollutants removal efficiency and production capacity of the battery are the best at this time; Anode chamber stirring can increase the rate of COD degradation, but it also will reduce the efficiency of electricity production of MFC. When the stirring speed is 1000 r/min, the COD degradation efficiency is highest.Finally, study the optimal operating conditions of the MFC with the orthogonal experiment to. It has two theories of the optimum operating conditions that were based on the MFC anolyte COD removal efficiency and electrical production. It get the optimal operating conditions of the battery system by analysising the performance of the MFC at the two conditions.It shows that:The temperature, pH value and the anode chamber stirring speed can affect the performance of MFC, and controling operating conditions can effectively improve the performance of MFC; The microbial habitat affects the optimal pH value of the battery. The microbial cultured can change the community structure of microbial, which can satisfy the requirement of the Sewage treatment; the removal efficiency of Cu2+ changed with the voltage of MFC. It is helpful to the cathode of liquid state high pollutant removal by improving the production performance of MFC; The MFC can be used as a primary treatment of organic wastewater.