Nitrogen Removal Performance and Microbial Community Analysis of Anoxic and Oxic Process in Electrolytic Manganese Residue Leachate

Abstract

Ammoniacal nitrogen present in leachate manganese electrolytes has gravely affected the ecosystem. This goal of this study was to use the anoxic and oxic process to treat the leachate from low COD/Nitrogen (C/N) manganese wastewater residue and to examine the reactor’s removal of nitrogen efficiency, sludge morphology, and microbial community of the reactor. The results indicate that the removal efficiencies of NH4+–N and TN are 95.33%±0.19%, 91.63%±3.06%, and 98.09%±1.49% for chemical oxygen demand (COD) respectively, after a 193 day operation. Scanning electron microscopy analysis of the activated sludge surface’s microbial body revealed elevated microbe densities that progressively complicated internal voids and layers as well as reasonably dense microbial colonies. Thauera and Truepera, the dominant bacteria in the system, are capable of completing removing nitrogen and COD from the reactor. The growth and reliable operation of shortcut nitrification and denitrification processes is supported by Nitrosomonas. Manganese can be oxidized by a genus of bacteria called Aminobacter. Manganese can be used in this system as an electron donor to promote nitrogen removal. According to the aforementioned conclusion, this study has succeeded in achieving a stable shortcut nitrification and denitrification of manganese auto oxygen at a low C/N.