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Wastewater treatment process for advanced bio-denitrification

A biological denitrification and sewage treatment technology, applied in the field of water treatment technology, can solve problems such as difficulty in meeting discharge standards and poor denitrification effect, and achieve the effects of reducing engineering construction investment, reducing the amount of residual sludge, and shortening the residence time

Inactive Publication Date: 2017-01-25
上海仁野环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally, when the synchronous denitrification and phosphorus removal process is operated in a general sewage treatment plant, due to the influence of various external factors, especially the influence of low temperature in winter, the denitrification effect is poor, and it is difficult to meet the current increasing discharge standards.

Method used

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  • Wastewater treatment process for advanced bio-denitrification
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  • Wastewater treatment process for advanced bio-denitrification

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Embodiment Construction

[0039] Reference attached figure 2 , in the traditional biological nitrogen and phosphorus removal system (in A 2 / O process as an example), add a set of sludge membrane bioreactor (SMBR), through the SMBR to carry out delayed aeration on part of the return activated sludge in the secondary sedimentation tank, and add part of the supernatant of the sludge concentration tank with high ammonia nitrogen The nitrifying bacteria are used as nutrients to create an environment suitable for the growth of nitrifying bacteria, so that the nitrifying bacteria are dominant in the SMBR, and then the sludge rich in nitrifying bacteria is returned to the aerobic tank to enhance the nitrification effect, and the nitrifying liquid is returned to the anoxic zone or plant reuse within.

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Abstract

The invention discloses a wastewater treatment process for advanced bio-denitrification. According to the process, on the basis of a traditional biological nitrogen and phosphorus removal process, a sludge membrane bioreactor (SMBR) is additionally arranged, so that an advanced bio-denitrification process is formed. The process is characterized by carrying out SMBR extended aeration treatment on part of secondary sedimentation tank returned sludge, building an environment suitable for the growth of nitrobacteria in the SMBR, and returning sludge enriching the nitrobacteria into an aerobic pool, so that the nitration efficiency of a large amount of nitrobacteria with high activity is greatly improved, and the SMBR discharge water is returned into an anaerobic pool so as to be denitrified or recycled in plants. According to the advanced bio-denitrification process, the hydraulic retention time of the aerobic pool can be reduced, the denitrification efficiency of a sewage treatment plant can be improved, and the surplus sludge of a secondary sedimentation tank can be reduced and stabilized. The process provided by the invention not only can be applicable to new sewage treatment plants, but also can be applicable to upgrading and reconstruction of the existing sewage treatment plants.

Description

technical field [0001] The patent of the invention relates to a sewage treatment process for strengthening biological denitrification, and specifically belongs to a water treatment technology. Background technique [0002] With the development of industry and the continuous improvement of residents' living standards, the types of pollutants in urban sewage and industrial wastewater are increasing day by day. Among them, the two types of pollutants that have a great impact on the environment and are ubiquitous are nitrogen and phosphorus. Organic nitrogen and ammonia nitrogen in the water will consume dissolved oxygen in the water, making the water black and smelly; too much nitrogen and phosphorus in the water will cause eutrophication of the water body and deteriorate the water environment. Therefore, nitrogen and phosphorus in sewage must be removed. [0003] At present, according to the types of pollutants and discharge standards, sewage treatment plants mostly use bio...

Claims

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Application Information

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IPC IPC(8): C02F3/30
CPCC02F3/308
Inventor 徐俊伟倪卫兵魏金豹
Owner 上海仁野环保科技有限公司
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