Transformation method, component and system for realizing composite denitrification of urban sewage treatment plant

Abstract

The invention discloses a transformation method, a transformation assembly and a transformation system for realizing composite denitrification of an urban sewage treatment plant, which are used for an AAO process urban sewage treatment plant formed by connecting an anaerobic tank, a first anoxic tank, a second anoxic tank, a first aerobic tank, a second aerobic tank, a third aerobic tank, a fourth aerobic tank, a rear anoxic tank, a rear aerobic tank and a secondary sedimentation tank. The method comprises the following steps: polyethylene suspended fillers are respectively arranged in the anaerobic tank and the first anoxic tank; a blocking net is arranged at the overflowing opening between the anaerobic tank and the first anoxic tank, and an aeration purging pipe is arranged at the blocking net; an anoxic tank aeration disc is laid in the first anoxic tank; an external carbon source feeding pipe connected with the first anoxic tank is connected to the second anoxic tank; and a nitrification liquid return pipe connected from the tail end of the fourth aerobic tank to the front end of the first anoxic tank is changed to be connected to the front end of the second anoxic tank. An urban sewage treatment plant adopting the AAO process can be transformed into a composite denitrification system with anaerobic ammonia oxidation autotrophic nitrogen removal and traditional denitrification coexisting in situ, so that the sewage treatment cost is reduced, and the green and efficient treatment of urban sewage is realized.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a transformation method, component and system for realizing compound denitrification of urban sewage treatment plants. Background technique [0002] At present, most urban sewage treatment plants use the traditional anaerobic / anoxic / aerobic (A / A / O) or its variant process to achieve the removal of nitrogen and phosphorus pollutants in raw water. Due to the low concentration of organic matter in urban sewage, carbon sources are often insufficient, so many urban sewage treatment plants rely on adding external carbon sources (sodium acetate, methanol, etc.) There are other problems in sewage treatment plants. [0003] In recent years, the anammox technology has attracted widespread attention due to its advantages in energy saving and consumption reduction, which can save a lot of aeration energy consumption, carbon source consumption, and reduce excess sludge production. However, th...

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Problems solved by technology

[0005] Based on the problems existing in the prior art, the purpose of the present invention is to provide a transformation method, components and system for realizing compound denitrification of urban sewage treatment plants, which can solve the problem of using traditional anaerobic, anoxic and aerobic methods or their deformation The urban sewage treatment plant with advanced technology cannot simply realize the anaerobic ammonium oxidation autotrophic denitrification process, and the existing carbon source is insufficient, the energy consumption is large, and the problem of being unable to meet the increasingly stringent emission standards

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