NOVELTY - A wastewater deep denitrification and dephosphorization device comprises anaerobic tank (2), anoxic tank, and aerobic device (6) containing membrane (7) and aeration device (8) in which anoxic tank is divided into 3 sections. Wastewater deep denitrification and dephosphorization is performed by sending sewage to anaerobic tank and anoxic tank 2nd section (4), performing hydrolysis acidification, accumulating phosphate, denitrifying, sending to anoxic tank 3rd section (5), performing precipitation treatment, separating precipitate, and returning part of sludge to anaerobic tank.    USE - A wastewater deep denitrification and dephosphorization device.    ADVANTAGE - Wastewater deep denitrification and dephosphorization device improves microorganism metabolic activity, wastewater treatment efficiency, water environment quality, and process operation stability, reduces consumption, and has simple process.    DETAILED DESCRIPTION - A wastewater deep denitrification and dephosphorization device comprises anaerobic tank (2), anoxic tank, and aerobic device (6) containing membrane (7) and aeration device (8) in which anoxic tank is divided into 3 sections. Wastewater deep denitrification and dephosphorization is performed by sending sewage to anaerobic tank and anoxic tank 2nd section (4), performing hydrolysis acidification, accumulating phosphate, denitrifying, sending to anoxic tank 3rd section (5), performing precipitation treatment, separating precipitate, returning part of sludge to anaerobic tank, discharging remaining sludge, sending supernatant to aerobic tank, nitrifying, and performing membrane separation. An INDEPENDENT CLAIM is included for wastewater deep denitrification and dephosphorization which involves pumping wastewater to anaerobic tank:anoxic tank 2nd section with volume ratio of 2-9:1, mixing with 0.1-0.4 unit volumes reflux sludge in anaerobic tank, sending overflow to anoxic tank 1st section (3), mixing with 1-3 unit volumes nitrified liquid, sending to anoxic tank 2nd section, mixing with wastewater, sending to anoxic tank 3rd section, precipitating, returning reflux sludge to anaerobic tank, discharging remaining sludge, sending 1.6-3.6 unit volumes separated supernatant to aerobic membrane bioreactor, mixing with nitrified sludge, standing for 2-4 hours, performing solid-liquid separation, discharging, sending 1-3 unit volumes separated supernatant to anoxic tank 1st section, and discharging remaining treated effluent.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of wastewater deep denitrification and dephosphorization device.    Anaerobic tank (2)    Anoxic tank 1st section (3)    Anoxic tank 2nd section (4)    Anoxic tank 3rd section (5)    Aerobic device (6)    Membrane (7)    Aeration device (8)