Patent ID: 11905194
Assignee: ZHEJIANG HAIHE ENVIRONMENTAL TECHNOLOGY CO., LTD.
Field: Environmental technology (Chemistry)
Classification: CPC C  Y | IPC C

Claim 0:
1. A denitrification treatment system for wastewater by anaerobic-anoxic-oxic (A2O) based on high-oxygen three-phase contact, comprising an annular anaerobic treatment device, a uniform water distribution device, a high-oxygen three-phase contact biological oxidative degradation device, a nitrification liquid collecting and shunting device, an annular nitrification liquid anoxic nitrification device and a sludge sedimentation reflux clean water discharge device sequentially connected along a wastewater treatment flow direction between a water inlet and a water outlet, wherein the annular anaerobic treatment device surrounds a periphery of the annular nitrification liquid anoxic nitrification device, the annular nitrification liquid anoxic nitrification device surrounds a periphery of the sludge sedimentation reflux clean water discharge device, and an upper part of the sludge sedimentation reflux clean water discharge device is sequentially provided from bottom to top with the nitrification liquid collecting and shunting device, the high-oxygen three-phase contact biological oxidative degradation device and the uniform water distribution device; the high-oxygen three-phase contact biological oxidative degradation device is used for converting ammonia nitrogen in the wastewater into nitrate nitrogen after a nitrification reaction in an oxic process, and the annular nitrification liquid anoxic nitrification device is used for carrying out an anoxic denitrification reaction on the nitrate nitrogen under a condition of having a carbon source to generate nitrogen dioxide and nitrogen to realize denitrification,
wherein the annular anaerobic treatment device comprises an annular anaerobic reaction zone, an upper part of a side of the annular anaerobic reaction zone is provided with the water inlet, a lower part of the side is provided with an anaerobic zone water exit, an upper surface of a cover plate of the annular anaerobic reaction zone is provided with an odor exhaust pipe and an overhaul cover port, a first submersible mixer is arranged inside the annular anaerobic reaction zone, and the anaerobic zone water exit is connected to a first end of an anaerobic zone lifting pump,
wherein the uniform water distribution device comprises a first water storage tray, an inlet arranged at an outer side of the first water storage tray is connected to a second end of the anaerobic zone lifting pump, a plurality of perforations are arranged in the first water storage tray, overflow umbrella shower heads are installed in all the perforations, peripheries of the overflow umbrella shower heads are annular overflow rings, heights of top ends of the overflow rings are lower than a peripheral fence, upper openings of the overflow rings are provided with a plurality of serrated overflow openings, and bottoms of the overflow rings are fixed with umbrella-shaped water diversion cones through fixing strips.