Bio-treatment method for dephosphorization and denitrogenation of sewage

A biological treatment and sewage technology, which is applied in the field of biological treatment of phosphorus and nitrogen removal in sewage, can solve the problems of reduced efficiency of nitrogen and phosphorus removal, and achieve the effects of increased oxygenation efficiency, reduced residence time, and reduced amount of rapidly degraded organic matter

Inactive Publication Date: 2006-12-27
UNIV OF SCI & TECH OF CHINA
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AI Technical Summary

Problems solved by technology

Although the primary sedimentation tank is used to intercept part of the particulate organic matter that is easy to settle, there are still a large amount of colloid and small particle organic matter that are difficult to settle into the biological treatment system. Because the biological treatment methods used in the above-mentioned various processes usually include at least one aerobic treatment process , so that the sewage stays in the aerobic tank for a long time, a large amount of colloidal and granular organic matter is hydrolyzed, not only needs to provide more energy to generate the oxygen required to provide microorganisms to oxidize and degrade organic matter, but also a large amount of granular organic matter is hydrolyzed and oxidized Reduce the organic matter required for phosphorus and nitrogen removal in the system, and reduce the efficiency of nitrogen and phosphorus removal

Method used

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  • Bio-treatment method for dephosphorization and denitrogenation of sewage

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Embodiment 1

[0029] see figure 1 .

[0030] The system consists of adsorption tank, sedimentation tank, regeneration tank, selection tank, phosphorus removal tank, nitrification tank, denitrification tank and hydrolytic acidification tank. The sewage first enters the adsorption tank, mixes with the sludge returned from the regeneration tank, and is removed by adsorption and other processes. For particulate pollutants in the sewage, the aerator is used to aerate, so that the dissolved oxygen concentration in the adsorption tank is 0.2-0.5mg / l, and the sewage residence time is 45 minutes. The mixed liquid is discharged from the adsorption tank to the sedimentation tank. The residence time of the sedimentation tank is 2 hours to realize the separation of mud and water. The supernatant enters the biological aerated filter for nitrification, and then enters the denitrification biological aerated filter to realize denitrification. The residence time is respectively 1 hour and 1.5 hours. 70% of...

Embodiment 2

[0032] see figure 2 .

[0033] The system consists of adsorption tank, sedimentation tank, regeneration tank, selection tank, dephosphorization tank, nitrification tank and hydrolytic acidification tank. The sewage first enters the adsorption tank, mixes with the sludge returned from the selection tank, and removes the particulate matter in the sewage through adsorption and other processes. Pollutants are aerated with an aerator, so that the dissolved oxygen concentration in the adsorption tank is 0.2-0.5mg / l, and the residence time of sewage is 45 minutes. The mixed liquid is discharged from the adsorption tank to the sedimentation tank. The residence time of the sedimentation tank is 2 hours to realize the separation of mud and water. The supernatant enters the biological aerated filter for nitrification and the residence time is 1 hour. The effluent is directly discharged into the natural water body. The remaining sludge discharged from the sedimentation tank, accounting ...

Embodiment 3

[0035] see image 3 .

[0036] The system is composed of adsorption tank, sedimentation tank, regeneration tank, nitrification tank, denitrification tank and hydrolytic acidification tank. The sewage first enters the adsorption tank, mixes with the sludge returned from the regeneration tank, and removes particulate pollutants in the sewage through adsorption and other processes. Use the aerator to aerate, so that the concentration of dissolved oxygen in the adsorption tank is 0.2-0.5 mg / l, and the residence time of sewage is 45 minutes. The mixed liquid is discharged from the adsorption tank to the sedimentation tank. The residence time of the sedimentation tank is 2 hours to realize the separation of mud and water. The supernatant enters the biological aerated filter for nitrification, and then enters the denitrification biological aerated filter to realize denitrification. The residence time is respectively 1 hour and 1.5 hours. 70% of the sludge discharged from the sedime...

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Abstract

The invention discloses a sludge dephosphorizing and denitrifying biological disposing method, which comprises the following parts: adsorbing pool, sedimenting pool, regenerating pool, selecting pool, dephosphorizing pool, nitrated pool, denitrifying pool and hydrolytic acidifying pool, wherein the effluent enters in the adsorbing pool firstly to blend with reflux sludge in the selecting pool; the blending liquid is drained from adsorbing pool to sedimenting pool to separate mud from water; the supernatant enters into nitrated pool to denitrify in the denitrifying pool to drain; the sediment part of sludge is proceeded anaerobic hydrolysis in the hydrolytic acidifying pool; the supernatant is inputted into dephosphorizing pool to proceed chemical dephosphorizing; the other part of sediment pool refluxes sludge into selecting pool under anaerobic environment; the composite liquid from selecting pool is input in the regenerating pool; the other part supernatant from dephosphorizing pool is input in the denitrifying pool to accelerate denitrifying action.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a biological treatment method for phosphorus and nitrogen removal of sewage. Background technique [0002] Urban sewage and a lot of industrial wastewater contain high concentrations of nitrogen and phosphorus nutrients. Discharging them into natural water bodies will cause serious environmental pollution problems. Therefore, nitrogen and phosphorus removal from sewage is one of the keys to sewage treatment. [0003] Sewage biological treatment is one of the widely used technologies for nitrogen and phosphorus removal in sewage. The principle of phosphorus removal is to alternate the activated sludge in an anaerobic and aerobic environment, so that a type of bacteria with a strong absorption of phosphorus becomes the dominant species in the system, and phosphorus is absorbed by microorganisms and converted into a solid state, thereby achieving muddy water through sedimentation. Sepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/28C02F1/52C02F3/30
Inventor 黄卫东
Owner UNIV OF SCI & TECH OF CHINA
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