[Effects of Organic Substrates on ANAMMOX-MFC Denitrification Electrogenesis Performance]

An anaerobic ammonium oxidation microbial fuel cell (ANAMMOX-MFC) was successfully started by inoculating anaerobic ammonium oxide sludge into the anode of a microbial fuel cell and then used to study the effect of glucose and phenol on ANAMMOX-MFC denitrification electrogenesis performance. The results showed that the ANAMMOX bacteria promoted ANAMMOX-MFC denitrification when the concentration of glucose was low (100-200 mg·L^-1). At that time, the chemical oxygen demand (COD) concentration of the reactor was not significant. The electrogenesis production performance and NH₄⁺-N removal rate gradually decreased when the glucose concentration was higher than 300 mg·L^-1, but the NO₂^--N removal rate generally remained unchanged. The COD concentration was also reduced, indicating that the activity of the ANAMMOX bacteria was inhibited and the activity of denitrification bacteria began to increase. The polarization curve fitting degree was low, and the change in COD concentration had little effect on the battery internal resistance. When the concentration of phenol was low (50-100 mg·L^-1), there was little effect on ANAMMOX-MFC denitrification electrogenesis performance. When the concentration of phenol exceeded 200 mg·L^-1, ANAMMOX-MFC denitrification performance was gradually inhibited. Overall, in the process, the COD concentrations of the water influent and effluent changed little, the polarization curve fitting degree was low, and the apparent internal resistance increased slowly.