Deep nitrification biological fluidized bed wastewater treatment device

The utility model belongs to the technical field of wastewater treatment, and particularly relates to a deep nitrification biological fluidized bed wastewater treatment device which comprises a biological fluidized bed reactor, a water inlet pipe and a sludge discharge pipe are arranged at the bottom of the biological fluidized bed reactor, and the upper part is a filler layer; a gas supply system is also arranged in the biological fluidized bed reactor and comprises two sets of pipelines; wherein the gas supply pipeline positioned in the filler layer is an aeration gas pipe, and the gas supply pipeline positioned at the bottom of the biological fluidized bed reactor is a backwashing gas pipe; the aeration air pipe divides the filler layer into an aerobic zone and an anoxic zone, and the bottom of the biological fluidized bed reactor is a denitrification zone. The utility model can solve the problems that the occupied area is large, the capital construction cost is high and the process flow is difficult to si