Denitrifying biological rotary disk device

The utility model relates to a denitrifying biological rotating disk device which is applied to an advanced technology for processing small-and-medium-size domestic wastewater and industrial wastewater. The utility model is characterized in that in a frame (1), the left side is provided with a denitrifying pool (1A), and the right side is provided with a reaction pool (1B). A rotating shaft (5) is transversely positioned in the middle of the reaction pool (1B), one end of the rotating shaft (5) is connected with a motor (6), and the middle of the rotating shaft is respectively provided with a three-stage biological rotating disk. A partition board (13) is arranged between the three-stage biological rotating disk, and a lifting tube is arranged outside the three-stage biological rotating disk. One side over against the lifting tube in the reaction pool is provided with a backflow slot (11). The water outlet end of the backflow slot is connected with a backflow tube (12). The backflow tube (12) is connected with a backflow control valve (14). A water inlet tube (7) and a mud discharging tube (8) are respectively connected with the denitrifying pool (1A) and the outer part. A water outlet tube (10) is communicated with the reaction pool (1B) and the outer part. A communicating tube (9) is communicated with the reaction pool (1B) and the denitrifying pool (1A). The lower part of the denitrifying pool (1A) is provided with filler (16) of the denitrifying pool.