Study On The Electrical Performance Of Microbial Fuel Cells And The Degradation Of The Two Phases Of The Anion And Cation

By constructing a microbial fuel cell(MFC),the wastewater containing pchlorophenol is added to the cathode,and the chlorination of p-chlorophenol is carried out by the reduction ability of the cathode to produce the relatively less toxic phenol.The treated solution of the chlorine is transferred to the anode and the phenol is degraded by the anode microbes.Compared with the traditional MFC anode degradation of chloroprene,the wastewater containing chlorophenol in the same MFC has been through the two stages of cathode and anode step-by-step degradation treatment,gaining better results.In order to master the process characteristics of the treatment of chlorophenol wastewater by the step-by-step degradation of cathode and anode,and to compare with the effect of the anode degradation treatment on chlorophenol wastewater,a number of MFC are built,in the other operating conditions to maintain the same premise,by changing the MFC external resistance,substrate type,concentration,with or without coaxial and external circuit connection conditions.The effects of MFC on the degradation of chlorophenol,phenol and the performance of electricity,the effect of cathodic dechlorination on chlorophenol and the production performance were studied.At the same time,the pretreatment of the initial p-chlorophenol concentration of 100 mg / L was carried out by MFC two-step step-down degradation method,traditional MFC anode degradation method and traditional anaerobic microbial degradation method.The feasibility and degradation effect of each method were studied,and the degradation effect was compared.The results show that MFC cathode and anode two-step degradation method has some advantages compared with other methods.The main findings are as follows:(1)MFC anode degradation method can effectively degrade p-chlorophenol in wastewater.With 25 mg / L p-chlorophenol and 1 g / L sodium acetate as the cosubstrate anode substrate,the cathode uses the air cathode,the external resistance is 1000?.The maximum output voltage of 355 mV,the maximum output power of 43.6mW / m2,the degradation rate of chlorophenol can reach 91.2%.(2)MFC anode degradation method can effectively degrade phenol in wastewater.100 mg / L phenol and 1 g / L sodium acetate as the co-substrate anode substrate,the cathode using the air cathode,the external resistance of 1000?.The maximum output voltage of 537 mV was obtained,and the degradation rate of phenol was 99.7%.(3)MFC cathode and anode two-step degradation of p-chlorophenol is divided into two main steps:(1)cathodic dechlorination stage: the chlorophenol is added to the MFC cathode chamber as the electron acceptor,the anode chamber is added to the cathode dechlorination solution,battery.The maximum output voltage of MFC is 215 mV at this stage.93.4% of p-chlorophenol is converted to phenol;(2)anode degradation stage: the cathodic dechlorination treatment solution is transferred to the anode chamber and add 1 g / L sodium acetate as co-substrate anode substrate,cathode Use the air cathode to run the battery.At this stage almost all of the phenol were degraded,the final solution of chlorophenol residual concentration of 3.8 mg / L,the maximum output voltage of 277 mV.The total voltage of the whole MFC was 233 mV,and the total removal rate of p-chlorophenol was 96.2%.Compared with MFC anode degradation method and the traditional anaerobic biodegradation method,there are certain advantages.