Tanning wastewater denitrification treatment device

The utility model discloses a tannery wastewater denitrification treatment device, which comprises a preliminary filter tank, a reaction tank and a settling tank, the lower end of the preliminary filter tank is communicated with the upper end of the reaction tank, the lower end of the reaction tank is communicated with a connecting pipe, the connecting pipe is provided with an electromagnetic valve, and the lower end of the connecting pipe is communicated with the upper end of the settling tank. The upper end of the preliminary filter tank is communicated with a wastewater inlet pipe, a plurality of layers of filter screens are connected between the inner walls of the preliminary filter tank, and a rotating shaft is rotatably arranged between the inner side walls of the preliminary filter tank below the filter screens. The preliminary filtering effect on the wastewater is better; by arranging the rotating shaft and the fan blades, the fan blades can be driven by utilizing potential energy generated when waste