Microbial Fuel Cell Wastewater Treatment And Power Generation Performance Improvement

Energy shortage and environmental pollution have become difficult problems in human production,life and social development.Fossil fuels such as coal and oil are increasingly depleted,and the combustion of fossil fuels will produce a variety of solid or gaseous substances,leading to serious environmental pollution.The problem of energy and environment is becoming more and more serious,which poses a serious threat to human survival and social economy.Therefore,the research and utilization of new energy and clean energy become the core of all walks of life.Microbial fuel cell catalyst in microorganisms under the premise of the chemical in the wastewater can be converted into electric energy,is an electrochemical device to achieve the dual purpose of wastewater treatment and electricity production,both for wastewater treatment,the pollutants recycling,and green power to form new clean energy,the energy problem and environment at the same time,the pollution problem has been solved.Microbial fuel cells have many advantages,such as wide range of fuel sources,mild operating conditions,easy control of process conditions,high efficiency and cleanness,etc.,so the development potential cannot be estimated and MFC has been paid close attention to by all parties in the world.In the field of energy and environment,the research of microbial fuel cell will focus on how to improve the electricity performance of treatment waste water,which degraded difficultly.The choice of anode matrix is one of the main factors that affect the performance of microbial fuel cell.The type and concentration of anode matrix will indirectly affect the electricity performance by affecting the way of microorganisms.In order to improve the degradation rate of pollutants,the formation of co-substrate was used to improve the electrochemical performance of the microbial fuel cells.Oxygen content in the experimental device is also one of the main factors affecting the microbial fuel cell.The oxygen content will indirectly affect the electricity production by affecting the aerobic,anaerobic and other biochemical reactions of microorganisms.The use of porous materials in the air cathode is an effective way to increase the production capacity of batteries.In this paper,the performance of microbial fuel cell was improved from two directions of co-substrate and porous materials.Firstly,a microbial fuel cell of streptomycin wastewater on the anode matrix,the formation of co-substrate by using glucose,and the principle of co-metabolism of microorganism,comparative study of formation of production capacity and wastewater treatment effect before and after the co-substrate of microbial fuel cell;followed by microbial fuel cell nitrogen containing wastewater on the anode matrix,with PTFE membrane separates the microbial membrane and the air cathode,comparative study of porous materials have or not,and the microbial fuel cell production capacity and wastewater treatment effect also be compared.The following conclusions are obtained through experiments:(1)With streptomycin wastewater as anode substrate,the power generation capacity and wastewater treatment efficiency of microbial fuel cell were significantly improved after forming co-substrate.Streptomycin concentration was 50 mg/L,the battery has not formed the co-substrate removal rate of COD is52%,the current density is 25 m A/m2,the output voltage is 4.72 m V;the formation of co-substrate,the COD removal rate is 92%,the current density is300 m A/m2,the output voltage is 54 m V,is 10 times more than the streptomycin matrix.(2)A porous material,polytetrafluoroethylene membrane,was used between the bacterial biofilm and the air cathode with the nitrogen containing wastewater as the anode substrate.After 308 days of operation,the average removal rate of acetic acid and NH4+ of four kinds of devices(NB1,NB2,REF,NB0)all conform to the original design intention: PTFE membrane is beneficial to retard the decline of oxygen content in microbial fuel cell,ensure the nitration reaction,and effectively remove nitrogen organic compounds.After the experiment,the oxygen permeability coefficient is 1.6×10-3cm/s,0.2×10-3cm/s,1.2×10-3cm/s,0.8×10-3cm/s,respectively.That is to say,the order of the device is good to bad,NB1>REF>NB0>NB2.