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Advanced municipal sewage treatment method

A technology for urban sewage and advanced treatment, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, infiltration/dialysis water/sewage treatment, etc. Complex, increase the operating cost of the sewage treatment plant, etc.

Active Publication Date: 2013-12-11
BEIJING ORIGINWATER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the carbon source content of urban sewage in my country is generally low, the reaction mechanism of nitrogen and phosphorus removal is complex, and there are many influencing factors. There are various contradictions in different reaction processes in the same sewage treatment process, which leads to the removal effect of nitrogen and phosphorus in the existing technology. It is not ideal or cannot achieve efficient removal at the same time, and the removal rate of total nitrogen is particularly low, generally 65%~80%, which has become the main obstacle to limit the quality of effluent water and the reuse of effluent water
Dosing carbon source chemicals and chemical phosphorus removal agents can enhance the effect of nitrogen and phosphorus removal, but it will significantly increase the operating costs of sewage treatment plants

Method used

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  • Advanced municipal sewage treatment method

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Effect test

Embodiment 1

[0066] Example 1: Advanced treatment of urban sewage

[0067] The urban sewage advanced treatment method is specifically referred to in the appendix figure 1 .

[0068] The implementation steps of this embodiment are as follows:

[0069] The water quality concentration of a pretreated urban sewage is COD cr 212mg / L, ammonia nitrogen 32mg / L, total nitrogen 49mg / L and total phosphorus 2mg / L pretreated sewage, and the return activated sludge mixture from the oxidation ditch pool enters the anaerobic tank, and its reflux ratio is as described 40% of the pretreatment sewage meter. In the anaerobic tank, stir with a stirrer to suspend and mix the activated sludge to achieve dissolved oxygen <0.2mgL, HRT=1h, MLSS=2000mg / L;

[0070] Allow the anaerobic tank to flow out the activated sludge mixed solution into the oxidation ditch pond, and simultaneously allow the activated sludge mixed solution returned from the membrane tank to also enter the oxidation ditch pond, and its reflux ...

Embodiment 2

[0075] Example 2: Advanced treatment of urban sewage

[0076] The urban sewage advanced treatment method is specifically referred to in the appendix figure 1 .

[0077] The implementation steps of this embodiment are as follows:

[0078] The water quality concentration of a pretreated urban sewage is COD cr 812mg / L, ammonia nitrogen 108mg / L, total nitrogen 117mg / L and total phosphorus 19mg / L pretreated sewage, and the backflow activated sludge mixture from the oxidation ditch pond enters the anaerobic tank, and its reflux ratio is as described 150% of the pre-treated sewage meter. In the anaerobic tank, use a stirrer to stir to suspend and mix the activated sludge to achieve dissolved oxygen <0.2mg / L, HRT=3h, MLSS=5000mg / L;

[0079] Allow the anaerobic tank to flow out the activated sludge mixed solution into the oxidation ditch pond, and simultaneously allow the activated sludge mixed solution returned from the membrane tank to also enter the oxidation ditch pond, and its...

Embodiment 3

[0084] Example 3: Advanced treatment of urban sewage

[0085] The urban sewage advanced treatment method is specifically referred to in the appendix figure 1 .

[0086] The implementation steps of this embodiment are as follows:

[0087] The water quality concentration of a pretreated urban sewage is COD cr 870mg / L, ammonia nitrogen 74mg / L, total nitrogen 91mg / L and total phosphorus 11mg / L pretreated sewage, and the return activated sludge mixture from the oxidation ditch pool enters the anaerobic tank, and its reflux ratio is as described 100% of the pre-treated sewage meter. In the anaerobic tank, use a stirrer to stir to suspend and mix the activated sludge to achieve dissolved oxygen <0.2mg / L, HRT=2h, MLSS=4100mg / L;

[0088] Allow the anaerobic tank to flow out the activated sludge mixed solution into the oxidation ditch tank, and simultaneously allow the activated sludge mixed solution returned from the membrane tank to also enter the oxidation ditch tank, and its ref...

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Abstract

The invention relates to an advanced municipal sewage treatment process which comprises the flows of anaerobic pool, oxidation ditch pool, aerobic pool and MBR (membrane bioreactor) membrane pool. The process has two backflow paths: oxidation ditch pool-anaerobic pool and membrane pool-oxidation ditch pool. The pretreated municipal sewage flows through the anaerobic pool, the oxidation ditch pool, the aerobic pool and the membrane pool in sequence, and finally undergoes membrane filtration to obtain treated water. When the process is used for treating municipal sewage, extra addition of carbon source and phosphorous removal drug is not needed, the total nitrogen removal rate and the total phosphorous removal rate can be up to 95% at the same time, the total nitrogen concentration of effluent is less than 5mg / L, the total nitrogen concentration is less than 0.3mg / L, and the other indexes satisfy the national level-I A discharge standard. In the prior art, the total nitrogen removal rate is 62-80% in general, and the total phosphorous removal rate is 70-96.2% in general.

Description

【Technical field】 [0001] The invention relates to the technical field of wastewater treatment. More specifically, the present invention relates to a method for advanced treatment of urban sewage using membrane bioreactor (Membrane Bio-Reactor, MBR) technology. 【Background technique】 [0002] Existing urban sewage treatment technologies mainly include A 2 / O and its modified processes, such as activated sludge method, oxidation ditch method, SBR method, biofilm method, biofilter method and MBR method, etc. Among them, the MBR method is a new type of sewage treatment technology. It replaces the secondary settling tank in the traditional technology with a membrane with high separation accuracy. While obtaining high-quality treated water, it maintains a high concentration of activated sludge in the bioreactor and improves the system. Volumetric loading, thereby reducing the footprint of sewage treatment facilities, and reducing excess sludge production by maintaining low sludg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F1/44C02F3/30
Inventor 张悦俞开昌薛涛贾海涛文剑平吴强任金城
Owner BEIJING ORIGINWATER TECH CO LTD
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