Two-stage biological selection denitrifying phosphorus and nitrogen removal sewage treatment device and method thereof

Abstract

The present invention provides a two-stage biological selection denitrifying phosphorus and nitrogen removal sewage treatment device and a method thereof, relates to a device and a method for sewage treatment, and aims to solve the problem that inner contradiction existing in anaerobic, anoxic, aerobic and other phosphorus and nitrogen removal processes of a sewage treatment plant cannot meet the requirements of 'Discharge standard of pollutants for municipal wastewater treatment plant' (GB 18918-2002) in China. The device adopts a technical scheme that: a second anaerobic biological selector is communicated with a sedimentation tank; and a first anaerobic biological selector is communicated with an anoxic pond. The technical scheme of the method comprises the following steps: 1, pumping raw water into the first anaerobic biological selector; 2, allowing effluent treated by the step 1 to enter the second anaerobic biological selector; 3, allowing the effluent treated by the step 2 to flow to the anoxic pond; 4, allowing the effluent treated by the step 3 to enter a first aerobic pond; 5, allowing the effluent treated by the step 4 to enter a second aerobic pond; and 6, allowing the effluent treated by the step 5 to enter the sedimentation tank, and directly discharging supernatant. The device and the method are used for municipal sewage treatment.

Description

technical field

[0001] The invention relates to a sewage treatment device and method, belonging to the field of sewage treatment. Background technique

[0002] At present, most sewage treatment plants in my country use anaerobic, anoxic and aerobic biological treatment processes for nitrogen and phosphorus removal, but due to the defects of the process itself, it is mainly manifested in: nitrifying bacteria, denitrifying bacteria and phosphorus accumulating bacteria The contradictions of different sludge ages; the contradictions of the competition between nitrifying bacteria and phosphorus accumulating bacteria on the substrate (carbon source); the contradictions of the inhibition of anaerobic phosphorus release by the nitrate nitrogen carried by the sludge backflow; the contradictions of relatively large sludge production. The combination of the above contradictions makes it difficult for the nitrogen and phosphorus in the effluent of sewage plants to simultaneously meet the...

Examples

specific Embodiment approach 1

[0011] Embodiment 1: In this embodiment, the device includes a water tank 1, a first pump 2, a reaction tank, a rotameter 8, an air compressor 9, a sedimentation tank 10, an aeration pipe 11, two aeration heads 12, three A stirring paddle 13, a nitrifying liquid return pipe 14, a nitrifying liquid return pump 18, a first vent valve 19, a third vent valve 21, a fourth vent valve 22 and an outlet pipe 26, and the water tank 1 is connected to the reaction tank by the outlet pipe 26 connected, the outlet pipe 26 is provided with a first pump 2, the water tank 1 is provided with a first vent valve 19, and an anaerobic biological selector, an anoxic pool 5, and a first aerobic bioselector are sequentially separated in the reaction pool. Pond 6 and the second aerobic pool 7, described anoxic pool 5 is provided with a stirring paddle 13, the bottom of described anoxic pool 5 is communicated with the second aerobic pool 7 through nitrification liquid return pipe 14, and described nitrif...

specific Embodiment approach 2

[0012] Specific embodiment two: the angle between the center line of the plane where the blade of the stirring paddle 13 of the present embodiment is located and the vertical plane is 50°-70°, this structure can be used in the first anaerobic selector 3, the second anaerobic organism A better mixing effect is achieved in the selector 4 and the anoxic pool 5. Other compositions are the same as in Embodiment 1.

specific Embodiment approach 3

[0013] Specific embodiment three: the treatment method of secondary biological selection sewage in this embodiment is completed by the following steps: Step 1: raw water is pumped into the first anaerobic selector 3 via water tank 1, and part of the mixed solution in the anoxic pool 5 is returned to The first anaerobic selector 3 reduces the concentration of nitrate nitrogen in the raw water to below 0.1mg / L and maintains the concentration of dissolved oxygen in the first anaerobic bioselector 3 to be less than 0.2mg / L, and the reflux flow rate of the mixed solution It is 150-200% of the original water volume, and the hydraulic retention time is 1.8-2.0h;

[0014] The raw water is pumped into the first anaerobic selector 3 through the water tank 1 and fully mixed with the reflux mixture from the top of the anoxic tank 5, and the biodegradable macromolecular organic matter in the raw water is converted into volatilization under the action of facultative anaerobic fermentation ba...

technical field

[0001] The invention relates to a sewage treatment device and method, belonging to the field of sewage treatment. Background technique

[0002] At present, most sewage treatment plants in my country use anaerobic, anoxic and aerobic biological treatment processes for nitrogen and phosphorus removal, but due to the defects of the process itself, it is mainly manifested in: nitrifying bacteria, denitrifying bacteria and phosphorus accumulating bacteria The contradictions of different sludge ages; the contradictions of the competition between nitrifying bacteria and phosphorus accumulating bacteria on the substrate (carbon source); the contradictions of the inhibition of anaerobic phosphorus release by the nitrate nitrogen carried by the sludge backflow; the contradictions of relatively large sludge production. The combination of the above contradictions makes it difficult for the nitrogen and phosphorus in the effluent of sewage plants to simultaneously meet the...

Examples

specific Embodiment approach 1

[0011] Embodiment 1: In this embodiment, the device includes a water tank 1, a first pump 2, a reaction tank, a rotameter 8, an air compressor 9, a sedimentation tank 10, an aeration pipe 11, two aeration heads 12, three A stirring paddle 13, a nitrifying liquid return pipe 14, a nitrifying liquid return pump 18, a first vent valve 19, a third vent valve 21, a fourth vent valve 22 and an outlet pipe 26, and the water tank 1 is connected to the reaction tank by the outlet pipe 26 connected, the outlet pipe 26 is provided with a first pump 2, the water tank 1 is provided with a first vent valve 19, and an anaerobic biological selector, an anoxic pool 5, and a first aerobic bioselector are sequentially separated in the reaction pool. Pond 6 and the second aerobic pool 7, described anoxic pool 5 is provided with a stirring paddle 13, the bottom of described anoxic pool 5 is communicated with the second aerobic pool 7 through nitrification liquid return pipe 14, and described nitrif...

specific Embodiment approach 2

[0012] Specific embodiment two: the angle between the center line of the plane where the blade of the stirring paddle 13 of the present embodiment is located and the vertical plane is 50°-70°, this structure can be used in the first anaerobic selector 3, the second anaerobic organism A better mixing effect is achieved in the selector 4 and the anoxic pool 5. Other compositions are the same as in Embodiment 1.

specific Embodiment approach 3

[0013] Specific embodiment three: the treatment method of secondary biological selection sewage in this embodiment is completed by the following steps: Step 1: raw water is pumped into the first anaerobic selector 3 via water tank 1, and part of the mixed solution in the anoxic pool 5 is returned to The first anaerobic selector 3 reduces the concentration of nitrate nitrogen in the raw water to below 0.1mg / L and maintains the concentration of dissolved oxygen in the first anaerobic bioselector 3 to be less than 0.2mg / L, and the reflux flow rate of the mixed solution It is 150-200% of the original water volume, and the hydraulic retention time is 1.8-2.0h;

[0014] The raw water is pumped into the first anaerobic selector 3 through the water tank 1 and fully mixed with the reflux mixture from the top of the anoxic tank 5, and the biodegradable macromolecular organic matter in the raw water is converted into volatilization under the action of facultative anaerobic fermentation ba...

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