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Sewage secondary treatment system and treatment method

A technology of treatment system and treatment method, which is applied in the sewage secondary treatment system and treatment field similar to the inverted A2O process, can solve the problem of low reproducibility, achieve enhanced flexibility, improve impact resistance, and improve nitrogen removal efficiency Effect

Pending Publication Date: 2019-10-29
QINGDAO SPRING WATER TREATMENT +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing studies are mostly used on a small scale, and the water intake is mostly water distribution, so the engineering reproducibility is not high

Method used

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  • Sewage secondary treatment system and treatment method

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Experimental program
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Effect test

Embodiment 1

[0086] A sewage treatment plant in the north, the design water volume is 37500m 3 / d, influent COD, NH 3 , TN, TP are 430.4, 45.0, 45.8, 4.2mg / L respectively, and the sum of the total residence time is 16.2h; the sludge concentration in anoxic zone, transition zone and aerobic zone is 5700mg / L; the activated sludge system The sludge age is 17 days; DO2.0mg / L, and the effective specific surface area of ​​the suspension carrier used is not less than 800m 2 / m 3 . The denitrification denitrification phenomenon is obvious in the anoxic zone, and the phosphorus removal rate in this zone is 10%. The aerobic zone has synchronous nitrification and denitrification effect, and the total nitrogen removal rate in this zone is 7%. After secondary treatment, the effluent COD, NH 3 The average values ​​of , TN, and TP are 30.4, 0.8, 9.7, and 0.4 mg / L respectively, reaching the effluent standard of Grade A.

Embodiment 2

[0088] A sewage treatment plant in the north, the design water volume is 45000m 3 / d, influent COD, NH 3 , TN, TP are 286.4, 34.8, 40.0, 5.0mg / L respectively, and the sum of the total residence time is 19.0h; the sludge concentration in anoxic zone, transition zone and aerobic zone is 4300mg / L; the activated sludge system The sludge age is 13 days; DO2.0mg / L, the effective specific surface area of ​​the suspension carrier used is not less than 800m 2 / m 3 . The anoxic zone has obvious denitrification phosphorus removal effect, and the phosphorus removal rate in this area is 74%. The aerobic area has simultaneous nitrification and denitrification effect, and the total nitrogen removal rate in this area is 3.6%. Effluent COD, NH 3 The average values ​​of , TN, and TP were 25.6, 0.0, 8.1, and 0.01 mg / L, respectively, reaching the standard of Grade A.

[0089] The parts not listed above can be realized obviously under the guidance of the above-mentioned embodiments 1-2.

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Abstract

The invention discloses a sewage secondary treatment system and treatment method, and relates to the technical field of sewage treatment. The sewage secondary treatment system includes an anoxic area,a transition area, a primary aerobic area, a secondary aerobic area, a degassing area and a secondary sedimentation area which are successively connected; the anoxic area is connected with a water inlet pipe and the secondary sedimentation area is connected with a water outlet pipe; the transition area is successively divided into a transition area first corridor, a transition area second and a transition area third corridor from front to back; suspended carriers are added into the primary aerobic area and the secondary aerobic area; and a nitrifying liquid return pipe is connected between the degassing area and the anoxic area, the nitrifying liquid return pipe is taken as an internal return pipe, a sludge return pipe is connected between the secondary sedimentation area and the anoxic area, and the sludge return pipe is taken as an external return pipe. According to the sewage secondary treatment system and treatment method, an anaerobic area in an inverted A2 / O process is changed into the transition area, the transition area is divided into three corridors to promote water flow in the areas to advance by aeration, and the change of anoxic / aerobic conditions is achieved by controlling the aeration amount in the transition area.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an inverted A 2 Secondary sewage treatment system and treatment method of O process. Background technique [0002] With the emergence of eutrophication, the sewage treatment industry has gradually increased its requirements for the performance of nitrogen and phosphorus removal in sewage. A 2 O process (Anaerobic-Anoxic-Oxic, A 2 O), namely anaerobic-anoxic-aerobic process, is a common biological nitrogen and phosphorus removal process, which can be used in secondary sewage treatment process and reclaimed water reuse process. Traditional A 2 In the O process, the anaerobic section realizes the anaerobic biological phosphorus release process, the anoxic section realizes the denitrification process, and the aerobic section realizes the nitrification process and phosphorus uptake process. The activated sludge in the sedimentation tank enters the front end of the anaero...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/30C02F101/16C02F101/10
CPCC02F3/308C02F1/52C02F2203/006C02F2301/046C02F2301/08C02F2209/08C02F2209/14C02F2209/16C02F2209/22C02F2101/30C02F2101/16C02F2101/105Y02W10/10
Inventor 韩文杰周家中李志伟
Owner QINGDAO SPRING WATER TREATMENT