1. Anaerobic ammonia oxidation has high efficiency and low cost, which is an upgrading technology for biological denitrification of wastewater! Anaerobic ammonia oxidation process is an autotrophic process, which does not require additional carbon sources and has less sludge production. The operation cost can be greatly reduced by using this process. The volume load of the process is high, more than 10 times that of the traditional process, which can greatly reduce the volume of the reactor or reaction tank, and greatly reduce the cost input and floor area of the tank. 2. It can be used in photovoltaic industry, sludge digestion, coal chemical industry, garbage landfill, food processing, petrochemical industry, pharmaceutical chemical industry, metal smelting, livestock and poultry breeding, etc.