Research On The Denitrification And Electricity Generation Of Micro-biological Fuel Cell Based On The Coupled Reaction Of Anaerobic Ammonia Oxidation And Denitrification

In this study,the relationship of process performances of biological nitrogen removal and conductivity variation was investigated,and MFCs which are based on ANAMMOX and denitrification?ANAMMOX-MFC and ANAMMOX-DN MFC?were developed to investigate the performance of simultaneous biological Removal of nitrogen and electricity generation.The main results are as follows.?1?ANAMMOX-MFC was constructed by inoculating ammonium oxidizing bacteria enriched cultures into the anode chamber.Experiment results showed that the start-up time of ANAMMOX-MFC was 45 days.The removal efficiency of ammonia and nitrite reached more than 90%,when the substrate NH₄⁺-N and NO₂^--N concentration were 50 mg L^-1and 66 mg L^-1,respectively.The effluent NO₃^--N concentration was lower than 4 mg L^-1.The maximum voltage was 75.4 mV,and the maximum power density was 468.3 mW/m³.?2?The optimum pH range for the ANAMMOX-MFC reactor was6.5-8.5.The removal efficiency of NH₄⁺-N and NO₂^--N were decreased by 11%and 12%,when the substrate concentration was reduced by 0.5times.However,the nitrogen removal efficiency remained at above 90%,when the substrate concentration increased by 1.5 and 2 times.The voltage of electricity production was not varied with the substrate concentration variation.Adding low concentration organic matter?C:N=0.5:1?improved nitrogen removal performance and power generation.?3?The start-up time of ANAMMOX-DN MFC was 30 days.The anode nitrogen removal efficiency was more than 80%,the average maximum voltage was 58.7mV,with the maximum power density287.1mW/m³.Data showed that the nitrogen removal performance and power generation was lower than that of ANAMMOX-MFC.?4?TheoptimalpHrangeforanodicdenitrificationof ANAMMOX-DN MFC was 6.5-8.5.The removal efficiency of NH₄⁺-N and NO₂^--N were decreased,when the substrate concentration was reduced by 0.5 times.However,the nitrogen removal efficiency could reach at 99%,when the substrate concentration increased by 1.5 and 2times.Adding low concentration organic matter?C:N=0.5-2:1?improved nitrogen removal performance.Anammox-DN MFC has higher impact resistance against organic compounds shock.