Experimental Study On The Performance Of The Cage-Shaped MFC And The Treatment Of DCB Wastewater

More and more attention has been paid to the environmental problems in recent years.Researchers are not only simply satisfied with the pollution control with the development and maturation of water pollution treatment technology but in a step by step exploration of how to deal with pollution while recycling resources.In this background,this paper puts forward a new technology:combining water pollution control with electricity production,applied the laboratory self-made patented product to the experiment and made a comprehensive discussion.The single-chamber air-cathode Microbial Fuel Cells(MFCs)were built with biomass activated carbon fiber cage-shaped cathode.The electricity production performance,battery internal resistance and the optimum operating conditions of the BACFC-ACMFCs were studied under continuous running operation condition.The results showed that,in a running cycle,the optimum operating conditions of the MFCs are:the spacing between the electrodes is 10 cm,the degree of immersion is50%,pH=8,the sludge dosing quantity is 1.8 g/L.The maximum output voltage and power density of the BACFC-ACMFCs were 257.89 mV and 4082.99 mW/m~3respectively.And the battery internal resistance is 419.88?.On the basis of the previous experimental study,the anode liquid of MFCs were replaced with DCB wastewater,and the optimum conditions for DCB wastewater degradation were discussed.The results were as follows:the pH of the nutrient solution was 7.0,the initial concentration of DCB wastewater was 100 mg/L and the external resistance was 5000?.It was found that the maximum degradation efficiency of DCB in each test group corresponds to the test condition of the maximum output voltage of MFCs by comparison.The voltage output of the device system reaches its maximum value when the growth state of the microorganism in the optimum period,and the utilization efficiency of the organic matter in the waste water also reaches the peak value in the same time.The maximum removal rate of DCB wastewater in each group of MFCs can reach about 80%,which shows that the degradation efficiency of DCB wastewater by MFCs is feasible.In order to increase the voltage output of the MFCs system,it was decided to coat the electrodes.The coating is divided into a carbon-based layer,a catalytic layer and a diffusion layer.Experiments were found that the maximum voltage output of MFCs which was not coated was 199 mV while the maximum voltage output of coating MFCs was 329 mV,which was about 1.65 times that of the former.The electricity was 1.53 times that of the former.These all proved that the voltage and The amount of electricity has been greatly improved after the coating.Different doses of coated chemicals also have a great impact on the electrode performance.It was found that the voltage output of the system decreased with the increase of the amount of PTFE,decreased with the increase of the content of the carbon powder.Therefore,according to the self-made patented product's own characteristics and size can determine the coating optimal amount:PTFE solution 6 mL,toner content is 0.5g.