A/O tower integrated device for biological treatment of organic sewage containing COD and nitrogen and method by using the same

An integrated device for treatment of organic sewage, comprising:

• a water distributing zone, a filtrating zone, a three-phase contact aerobic zone, a nitrification liquid reflux discharging zone, a precipitated clear water discharging unit, and an anoxic zone;
• wherein the water distributing zone, the filtrating zone, the three-phase contact aerobic zone, the nitrification liquid reflux discharging zone and the anoxic zone are sequentially arranged in a cylinder body from top to bottom;
• a sewage inlet is arranged in the anoxic zone, and a water outlet of the anoxic zone is communicated with the water distributing zone;
• the three-phase contact aerobic zone is a non-ponding zone and an atmospheric pressure high oxygen biofilm filling zone;
• and the precipitated clear water discharging unit is arranged in the cylinder body, and a nitration liquid reflux discharging zone in the cylinder body comprises a nitration liquid collecting tank;
• wherein a bottom of the nitration liquid collecting tank is provided with an exhaust-nitrification liquid draft tube and a central guide cylinder;
• the central guide cylinder leads part of nitration liquid into the precipitated clear water discharging unit;
• and the exhaust-nitrification liquid draft tube discharges air in the anoxic zone to a vortex air supply zone, and guides another part of nitration liquid back to the anoxic zone.