NEW DEVELOPMENT OF BIOLOGICAL NITROGEN AND PHOSPHORUS REMOVAL PROCESSES FOR MUNICIPAL WASTEWATER

In recent years, with the acceleration of urbanization,surface water eutrophication caused by excessive nitrogen and phosphorus content in sewage has become increasingly serious,and highly efficient nitrogen and phosphorus removal technology has become a key demand for urban wastewater treatment. In this paper, we systematically sorted out the traditional and emerging technologies of biological nitrogen and phosphorus removal, and compared and analyzed their advantages and disadvantages. Firstly, the basic principles of biological nitrogen removal and phosphorus removal are introduced respectively, and the A2/O process with nitrification-denitrification as the core is elaborated in detail. Secondly, for the emerging technologies, low energy consumption processes such as BCFs, SHARON-ANAMMOX combined process and Dephanox process were introduced. Finally, the advantages and disadvantages of traditional and novel processes are compared by observing the activity of microflora and other indicators. The results show that the traditional technology is mature and stable but less economical, while the new technology has significant potential for energy saving and consumption reduction, but needs to further solve the stability problem of engineering application. The multi-dimensional comparison framework and process optimization path proposed in this paper can provide theoretical references for the technological upgrading and process selection of urban wastewater treatment plants, and has positive significance in promoting the technological innovation and sustainable development of water environment treatment.