Deep wastewater denitrification device based on special active sand filter tank

The utility model discloses a wastewater deep denitrification device based on a special active sand filter tank. Wherein the denitrification device comprises a specially-made active sand filter tank, a raw water tank and a dosing tank, the specially-made active sand filter tank is filled with a quartz sand filler with a certain particle size, inlet water uniformly flows in from bottom to top through a water distributor arranged in the sand filter tank, and the active sand filter tank is subjected to denitrification through filtration of a quartz sand filler layer and the action of microorganisms growing on the surface of the filler in an attached mode. And carrying out denitrification treatment on the sewage. The wastewater deep denitrification device is simple in structure and convenient to install. Based on the wastewater deep denitrification device disclosed by the utility model, the total nitrogen, especially nitrate nitrogen, in the sewage can be well removed even under the conditions that the nitrogen-c