An improved a2/o enhanced nitrogen and phosphorus removal treatment device and process for urban sewage

Abstract

The invention discloses a municipal sewage improved A2 / O enhanced denitrification and dephosphorization treatment device and process. The device comprises an anaerobic tank, a first anoxic tank, a second anoxic tank, an aerobic tank and a radial-flow type sedimentation tank which are connected with one another in sequence, wherein the anaerobic tank adopts hydraulic stirring, and is also connected with an anoxic mixed liquor reflux pump and the second anoxic tank by virtue of pipelines; an aerator is arranged at the bottom of each of the first anoxic tank and the second anoxic tank; the aerators are also distributed at the bottom of the aerobic tank; the anaerobic tank, the first anoxic tank, the second anoxic tank and the aerobic tank are arranged in a same shell, and are divided by separating plates; the radial-flow type sedimentation tank is connected with a sludge return pump and the anaerobic tank by virtue of the pipelines, and is connected with a water outlet pump and the aerobic tank by virtue of the pipelines. The process disclosed by the invention not only improves the denitrification efficiency, but also greatly reduces interferences of nitrate on the anaerobic tank, thus improving the dephosphorization efficiency. The treatment device disclosed by the invention is simple in structural style, flexible and changeable in running manner, less in floor area, and excellent in denitrification and dephosphorization effect.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to an urban sewage improvement A 2 / O enhanced denitrification and dephosphorization devices and processes. Background technique [0002] From the statistical data of water pollution in my country, it can be seen that the main pollution factors of urban water are chemical oxygen demand, total phosphorus and total nitrogen. The existing urban sewage treatment plants in my country have long been mainly aimed at the removal of carbon source pollutants. Although the BOD removal rate can reach more than 90%, the nitrogen removal rate is generally only 20% to 50%, and the phosphorus removal rate is 20% to 20%. 30%, ignoring the removal of nitrogen and phosphorus, the main nutrients that lead to eutrophication of water bodies. [0003] The main hazard of nitrogen and phosphorus pollution in water bodies is the eutrophication of water bodies. The eutrophication of the water body ...

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Problems solved by technology

[0007] The present invention aims at the deficiencies of the existing denitrification and phosphorus removal processes, such as few, generally complex process flow, many structures, and cumbersome operation control, etc., and devotes itself to the development and application of the new process of denitrification and phosphorus removal technology, giving full play to the advantages of the technology, and developing A kind of urban sewage improvement A with simple structure, flexible and changeable operation mode, small footprint, and excellent nitrogen and phosphorus removal effect was developed. 2 / O enhanced nitrogen and phosphorus removal device and process

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