Improved A2O nitrogen and phosphorus removal reactor and sewage treatment method

Abstract

The invention belongs to the field of biological treatment of wastewater or sewage, and particularly relates to an improved A2O nitrogen and phosphorus removal reactor and a sewage treatment method. The improved A2O nitrogen and phosphorus removal reactor provided by the invention comprises a reaction tank and a secondary sedimentation tank, wherein the reaction tank is sequentially divided into a pre-anoxic zone, an anaerobic phosphorus release zone, a heterotrophic-sulfur autotrophic denitrification zone and a synchronous nitrification sulfur autotrophic denitrification zone by virtue of partition plates, and the pre-anoxic zone, the anaerobic phosphorus release zone, the heterotrophic-sulfur autotrophic denitrification zone and the synchronous nitrification sulfur autotrophic denitrification zone are communicated in a baffling manner. By means of coupling heterotrophism and sulfur autotrophic denitrification in the anoxic zone, and coupling nitrification and sulfur autotrophic denitrification in the aerobic zone, the removal efficiency of nitrogen and phosphorus pollutants is improved while the low-carbon-nitrogen-ratio sewage denitrification process flow is shortened, and relatively high applicability is achieved.

Description

Technical field [0001] The present invention belongs to the field of wastewater or sewage, and there is a modified A 2 O Nitrogen and phosphorus reactor and sewage treatment method. Background technique [0002] In recent years, the researchers have continuously developed a new nitrogen-removing phosphate new technique for low-carbon nitrogen-specific sewage in re-examining traditional biological denitrification, such as synchronized denitrification, short-range nitrification, and phosphorus. And anaerobic ammonia oxidation and dielectric, etc. However, these new nitrogen-free process is complex, and the operating conditions are required in the application, such as temperature, pH, alkalinity, dissolved oxygen, etc., strict operating conditions limit the application range of new nitrogen-free processes, removal performance stability It is not guaranteed, so it is urgent to develop a newly-removal of a denitrification and phosphorus application of low-carbon nitrogen ratio under w...

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Problems solved by technology

[0003] Aiming at the technical problems in the prior art that the sewage denitrification and phosphorus removal process is complicated, the reaction conditions need to be precisely controlled in the application, the applicability is poor and the sewage treatment effect is unstable, the present invention provides an improved A 2 O Nitrogen and phosphorus removal reactor, which will improve A 2 O process is organically combined with sulfur autotrophic denitrification process, synchronous nitrification sulfur autotrophic denitrification, traditional anaerobic / aerobic biological phosphorus removal, denitrification phosphorus removal and coagulation sedimentation phosphorus removal process, and is regulated by the operation strategy of staged water inflow Allocation of influent carbon sources to achieve synergistic and efficient removal of organic matter, nitrogen, and phosphorus pollutants

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