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A2O-D2 synergistic nitrogen and phosphorus removal technology and device

A2O-D2, nitrogen and phosphorus removal technology, applied in aerobic and anaerobic process treatment, degassed water/sewage treatment, dehydration/drying/concentrated sludge treatment, etc., can solve anaerobic phosphorus release in anaerobic pool Efficiency reduction and other issues, to achieve good project utilization value, reduce the impact of hydraulic load, improve the effect of nitrogen removal efficiency

Pending Publication Date: 2018-10-19
BEIJING GENERAL MUNICIPAL ENG DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the project, the sludge from the secondary sedimentation tank is directly returned to the anaerobic tank. Due to the dissolved oxygen and nitrate nitrogen in the returned sludge, the anaerobic phosphorus release efficiency of the anaerobic tank is reduced. There is no good solution in the project.

Method used

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  • A2O-D2 synergistic nitrogen and phosphorus removal technology and device
  • A2O-D2 synergistic nitrogen and phosphorus removal technology and device
  • A2O-D2 synergistic nitrogen and phosphorus removal technology and device

Examples

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Comparison scheme
Effect test

Embodiment 1

[0075] In this example, a sewage treatment test is carried out on a city in the central and eastern part of my country, with a treatment capacity of 20m 3 / d. In the urban sewage, the average COD of the influent Cr The total nitrogen is 280mg / L, the total nitrogen is 39mg / L, the ammonia nitrogen is 27.5mg / L, and the total phosphorus is 7.6mg / L.

[0076] A 2 O-D 2 The process of synergistic nitrogen and phosphorus removal includes the following steps:

[0077] (1)A 2 O treatment: According to the traditional method, the urban sewage is sequentially introduced into the anaerobic pool, the anoxic pool, and the aerobic pool, and then the aerobic effluent is obtained after the anaerobic, anoxic, and aerobic treatments. The aeration in the traditional aerobic treatment The treatment has the function of mixing and oxygen supply, which increases the dissolved oxygen in the aerobic effluent to ensure that the concentration of dissolved oxygen in the aerobic effluent is 2-3 mg / L; 3...

Embodiment 2

[0084] In this example, a sewage treatment test is carried out on a city in southern my country, with a treatment capacity of 50m 3 / d. In the urban sewage, the average COD of the influent Cr The total nitrogen is 120mg / L, the total nitrogen is 26.7mg / L, the ammonia nitrogen is 23.3mg / L, and the total phosphorus is 2.4mg / L.

[0085] A 2 O-D 2 The process of synergistic nitrogen and phosphorus removal includes the following steps:

[0086] (1)A 2 O treatment: According to the traditional method, the urban sewage is sequentially introduced into the anaerobic pool, the anoxic pool, and the aerobic pool, and then the aerobic effluent is obtained after the anaerobic, anoxic, and aerobic treatments. The aeration in the traditional aerobic treatment The treatment has the function of mixing and oxygen supply, which increases the dissolved oxygen in the aerobic effluent to ensure that the concentration of dissolved oxygen in the aerobic effluent is 2-2.5 mg / L; 3 / 4 of the aerobic e...

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Abstract

The invention discloses an A2O-D2 synergistic nitrogen and phosphorus removal technology and device. The device comprises an anaerobic pool, an anoxic pool, and an aerobic pool which are successivelyconnected. The technology comprises the following steps: after performing anaerobic, anoxic and aerobic treatments on municipal sewage, obtaining aerobiotic effluent; enabling a deoxidation pool to beembedded in the aerobic pool, and dividing the water outlet end of the aerobic pool to two parts, wherein one part is refluxed to the anoxic pool after entering the deoxidation pool for deoxidation,and the other part is directly flowed to a secondary sedimentation pool, and a volume ratio of the two parts is (2-4):1; and enabling the tail end of the secondary sedimentation pool to be connected to a sludge thickening pool, enabling concentrated sludge to be refluxed to the anoxic pool, and enabling supernatant liquid to be refluxed to the deoxidation pool. The technology is capable of, on thebasis of a current A2O technology, further improving the nitrogen and phosphorus removal effect of the secondary treatment, reducing the sewage treatment investment and the operating cost, providingan A2O-D2 synergistic nitrogen and phosphorus removal technology flow and technological design key points and design parameters thereof, and providing a design of a sewage treatment plant and a solution scheme of upgrading and reconstruction.

Description

technical field [0001] The present invention relates to a 2 O-D 2 A process and device for coordinated denitrification and phosphorus removal belong to the technical field of sewage treatment process. Background technique [0002] Nutrient elements such as nitrogen and phosphorus enter lakes or rivers in large quantities, which is an important reason for eutrophication of water bodies. With the full implementation of the river chief system and the emphasis on the ecological environment in my country, in order to improve the quality of urban water environment, control the eutrophication of water bodies, and protect receiving water bodies, it is necessary to further reduce the nitrogen, nitrogen, and Reduce the content of pollutants such as phosphorus and improve the quality of effluent water. [0003] At present, the removal of nitrogen and phosphorus in municipal sewage treatment plants is mainly biological denitrification and biological phosphorus removal. The basic prin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/30C02F11/12C02F101/16
CPCC02F1/20C02F3/30C02F3/308C02F11/12C02F2301/08C02F2301/043C02F2103/007C02F2001/007C02F2101/16
Inventor 高守有刘雷斌
Owner BEIJING GENERAL MUNICIPAL ENG DESIGN & RES INST
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