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Bio-treatment method for dephosphorization and denitrogenation of sewage

A biological treatment and denitrification technology, applied in the field of biological treatment of sewage phosphorus and nitrogen removal, can solve problems such as the reduction of denitrification and phosphorus removal efficiency, and achieve the effects of improving oxygenation efficiency, short residence time, and reducing oxygen consumption.

Inactive Publication Date: 2009-06-03
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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Effect test

Embodiment 1

[0029] See figure 1 .

[0030] The system consists of adsorption tank, sedimentation tank, regeneration tank, selection tank, dephosphorization tank, nitrification tank, denitrification tank and hydrolysis acidification tank. Sewage enters the adsorption tank first, mixes with the sludge returned from the regeneration tank, and is removed by adsorption and other processes The particulate pollutants in the sewage are aerated with an aerator to make the dissolved oxygen concentration of the adsorption tank 0.2-0.5mg / l, and the sewage retention time is 45 minutes. The mixed liquid is discharged from the adsorption tank to the sedimentation tank. The retention 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 achieve denitrification. The residence time is respectively 1 hour and 1.5 hours. 70% of the sludge discha...

Embodiment 2

[0032] See figure 2 .

[0033] The system consists of adsorption tank, sedimentation tank, regeneration tank, selection tank, dephosphorization tank, nitrification tank and hydrolysis acidification tank. Sewage enters the adsorption tank first, mixes with the sludge returned from the selection tank, and removes particles in the sewage through adsorption and other processes For pollutants, use an aerator to aerate, so that the dissolved oxygen concentration in the adsorption tank is 0.2-0.5mg / l, and the sewage retention time is 45 minutes. The mixed liquid is discharged from the adsorption tank to the sedimentation tank. The retention 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. The retention time is 1 hour, and the effluent is directly discharged into the natural water body. The remaining sludge, which accounts for 70% of the total sludge discharged from the sedimentat...

Embodiment 3

[0035] See image 3 .

[0036] The system is composed of adsorption tank, sedimentation tank, regeneration tank, nitrification tank, denitrification tank and hydrolysis acidification tank. Sewage enters the adsorption tank first, mixes with the sludge returned from the regeneration tank, and removes particulate pollutants in the sewage through adsorption and other processes. Adopt an aerator to aerate, so that the dissolved oxygen concentration of the adsorption tank is 0.2-0.5mg / l, and the sewage retention time is 45 minutes. The mixed liquid is discharged from the adsorption tank to the sedimentation tank. The retention 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 achieve denitrification. The residence time is respectively 1 hour and 1.5 hours. 70% of the sludge discharged from the sedimentation tank ent...

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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 sewage treatment method for phosphorus and nitrogen removal. Background technique [0002] Urban sewage and many industrial wastewaters 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 activated sludge in an anaerobic and aerobic environment, so that a type of bacteria with strong phosphorus absorption becomes the dominant species in the system. Phosphorus is absorbed by microorganisms and converted into a solid state, thereby achieving muddy water through sedimentation Separate, remove excess activated sludge, ...

Claims

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Application Information

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