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Sewage treatment system and sewage treatment method

A technology of sewage treatment system and sewage treatment method, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. , to avoid damage

Inactive Publication Date: 2015-05-06
光大水务(济南)有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these situations are not normal problems in sewage treatment plants, once they occur, it is difficult to actively deal with them with the existing design concepts and process functions of sewage treatment plants. Even if countermeasures are taken, the cost of manpower and material resources will be high. The best countermeasure is often to reduce water inflow and rely entirely on the impact resistance of the activated sludge system itself
When the impact is light, the balance of microorganisms in the activated sludge system may be broken, and the functional bacteria with poorer bearing capacity will be more impacted, which will eventually affect the nitrification, denitrification, biological phosphorus removal and other reaction processes, resulting in the effluent exceeding the standard
When the impact is severe, the activated sludge system is paralyzed, and the recovery period is very long, making the sewage plant unable to operate normally

Method used

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  • Sewage treatment system and sewage treatment method

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Effect test

Embodiment 1

[0068] Under the condition of normal influent water quality, it operates in the improved AAO mode, that is, all the sludge in the secondary sedimentation tank is returned to the anaerobic tank, so that part of the sewage enters the multifunctional tank and part of the sewage enters the anaerobic tank for treatment, and then sequentially Enter the anoxic tank and aerobic tank for treatment, and make part of the effluent from the anaerobic tank return to the anaerobic tank and anoxic tank for anaerobic and denitrification treatment, and the other part of the effluent enters the secondary sedimentation tank to separate the active pollutants. After the mud is used as effluent, the concentration of mixed liquid suspended solids (MLSS) is 3000-5000mg / L, and the concentration of organic solids in the mixed liquid activated sludge (mixed liquid volatile suspended solids, MLVSS) is 1800~2800mg / L, SV30 is 20-40%, dissolved oxygen is 1.5mg / L-4.0mg / L, external reflux ratio is 50%-120%, int...

Embodiment 2

[0070] Under the condition of abnormal influent water quality, part of the returned sludge from the secondary sedimentation tank is returned to the multi-functional tank, and all the sewage influent is introduced into the multi-functional tank for treatment, and then the effluent treated by the multi-functional tank is sequentially entered into the multi-functional tank. Anaerobic pond, anoxic pond and aerobic pond are used for treatment, and the biodegradation of organic matter, nitrogen and phosphorus removal, and other reactions are carried out with the improved AAO process. Wherein the operating parameters of the multifunctional pool are: the residence time in the mixing zone is 30min, and the residence time in the sedimentation zone is 1 hour; the return sludge accounts for 15%-20% of the total return sludge amount; the sludge concentration is between 3000mg / L- 4000mg / L.

[0071] 1) When the influent concentration SS is 512mg / L, the adsorption and removal rate of SS in th...

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Abstract

The invention provides a sewage treatment system comprising a multifunctional tank, an anaerobic tank and a secondary sedimentation tank, wherein the multifunctional tank is connected with the anaerobic tank; and sludge in the secondary sedimentation tank can reflow to the anaerobic tank and can reflow to the multifunctional tank tunably. In addition, the invention also provides a sewage treatment method. The sewage treatment method comprises the following steps: returning a part of reflowing sludge of the secondary sedimentation tank to the multifunctional tank and introducing all of sewage intake water to the multifunctional tank to treat; and returning surplus reflowing sludge of the secondary sedimentation tank to the anaerobic tank and introducing outlet water of the multifunctional tank to the anaerobic tank to treat. By utilizing the sewage treatment system and the sewage treatment method, abnormal water inlet condition can be initiatively managed, operational risks are evaded, and stable operation of a sewage treatment plant is ensured.

Description

technical field [0001] The invention relates to the field of urban sewage treatment, in particular to a sewage treatment system and a sewage treatment method. Background technique [0002] When building a new sewage treatment plant or upgrading an old sewage plant, the selection and design of sewage treatment processes are mostly based on normal water inflow conditions, without considering the impact of abnormal water inflow. However, there are many emergencies in the actual operation of many sewage treatment plants, such as high-concentration influent shock, poisoning of heavy metals and toxic and harmful substances, high suspended solids (Suspended Solids, SS) inorganic particles and oily substances impact etc. Although these situations are not normal problems in sewage treatment plants, once they occur, it is difficult to actively deal with them with the existing design concepts and process functions of sewage treatment plants. Even if countermeasures are taken, the cost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 孙林波赵立春田顺孙凯陈文娟
Owner 光大水务(济南)有限公司
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