| Microbial fuel cell(MFC),can realize the dual functions of wastewater treatment and energy recovery,is a kind of green power generation technology for resource utilization,also can maximize meet the current environmental needs.Although MFC has great potential in wastewater treatment,compared with chemical fuel cells,MFC has shortcomings such as slow battery startup,low power generation,unstable operation and high cost,which restrict its engineering application.The purpose of this study is to find a simple,efficient and stable MFC operation method.Starting from the key factors that affect the performance of MFC,this study focuses on the power generation performance of battery cells,and systematically optimizes the operating conditions of MFC.The experiment proves that the MFC monomer with optimized operation conditions has higher power generation voltage in other similar studies,and has better power generation effect.It has the characteristics of short startup time,stable power generation and long cycle,and simple and efficient construction method.In addition,the optimized MFC can be used for the collaborative treatment of chemical and pharmaceutical wastewater containing phenol and indole.Through research,within10 days of stable operation of MFC,the degradation effect of low concentration indole wastewater is better than that of low concentration phenol wastewater,while the degradation effect of medium and high concentration phenol wastewater is better than that of indole wastewater.The optimized MFC system plays an active role in the treatment of phenol and indole wastewater for synergetic power generation,and has practical application value.The specific research contents are as follows:(1)This research aims to find a simple,efficient and stable MFC operation method.Starting from the key factors affecting the MFC performance,it focuses on the power generation of the battery,systematically optimizes the operation conditions of the MFC,and determines the optimal parameters:Inoculation source is the composite bacteria A1from four sources of anaerobic sludge(A1),river sediment(R2),paddy field sludge(F3)and commercial bacteria from a chemical pharmaceutical wastewater treatment plant in Shanghai×R2×F3×S4,noculation amount is 50m L,cathode electron acceptor is potassium ferricyanide,carbon felt electrode is modified by acidic potassium permanganate chemical oxidation+heat treatment,electrode area is 16cm~2,and CMI 7000 exchange membrane is selected.After 42 hours,the optimized MFC was successfully started,and the maximum stable voltage was 668 m V.The power could be continuously and stably generated for 198 hours.The power generation period was 324hours,the internal resistance was 262.88Ω,the open circuit voltage was 818.45 m V,and the maximum power density was 405 m W/m~2.Compared with the original MFC,the voltage and power density of the optimized MFC are increased by 120%～230%and100%～170%respectively.(2)The power generation performance and organic matter removal efficiency of MFC for phenol and indole simulated wastewater with concentrations of 50mg/L,250mg/L and 1000mg/L respectively were investigated within 10d of stable operation of MFC.The results showed that MFC system under optimized operation conditions played an active role in the treatment of pharmaceutical wastewater containing phenol and indole characteristic pollutants.Within 10 days of stable operation of MFC,MFC has better degradation effect on low concentration indole wastewater than low concentration phenol wastewater,and better degradation effect on medium and high concentration phenol wastewater than indole wastewater. |
