Aeration biological oxygen supply device in improved AAO (anaerobic-anoxic-oxic) tank

The utility model discloses an aeration biological oxygen supply device in an improved AAO tank, and belongs to the technical field of sewage treatment. The device comprises a treatment pond, a fixed structure and a rotating structure, an equipment box is arranged below one end of the treatment pond, a sliding groove is formed in the top end in the treatment pond, a supporting plate is arranged at the top end of the treatment pond, an electric push rod is arranged in the center of the bottom end of the supporting plate, and a transverse plate is arranged at the bottom end of the electric push rod; a fan box is arranged in the center of the top end of the supporting plate, an air suction fan is arranged in the fan box, an air inlet pipe is arranged at the input end of the air suction fan, an air inlet is formed in the top end of the air inlet pipe, an exhaust pipe is arranged at the output end of the air suction fan, an air spraying opening is formed in the bottom end of the exhaust pipe, and the exhaust pipe