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Short-cut denitrification synchronous denitrifying phosphorus removal process and apparatus

A denitrification dephosphorization and denitrification technology, applied in the field of environmental protection and sewage treatment, can solve the problems of poor denitrification and dephosphorization effects, and achieve the goals of prolonging hydraulic retention time, sufficient anaerobic phosphorus release, and realizing energy saving and consumption reduction Effect

Inactive Publication Date: 2009-01-28
TSINGHUA UNIV
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  • Claims
  • Application Information

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Problems solved by technology

In fact, in most cases, the biologically utilized COD in sewage is limited, and the relative shortage of this part of carbon source in sewage is the main reason for the poor nitrogen and phosphorus removal effect of the whole system.

Method used

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  • Short-cut denitrification synchronous denitrifying phosphorus removal process and apparatus

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Experimental program
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Effect test

Embodiment 1

[0028]Inoculate the activated sludge from the secondary sedimentation tank of Qinghe Municipal Wastewater Plant into the reactor, and the sludge concentration is about 4000mg / L. The COD concentration of raw sewage is 350-400mg / L, the ammonia nitrogen concentration is 50-60mg / L, and the total phosphorus concentration is 5-8mg / L.

[0029] 40% of the raw sewage enters the anaerobic reactor, and 60% directly enters the first aerobic reactor. The total hydraulic retention time of the system is 9h, the DO of the first aerobic reactor is controlled at 1.0mg / L, the pH is controlled at about 8.0, the DO of the second aerobic reactor is controlled at 0.5mg / L, and the DO in the rapid aeration tank is controlled at 2.0mg / L, the sedimentation time is 0.5h, and the sludge reflux ratio of the sedimentation tank is 100%. After one month of process operation, the system nitrosation rate reaches 70%, the effluent ammonia nitrogen is within 5mg / L, the effluent COD is within 20mg / L, and the eff...

Embodiment 2

[0031] Inoculate the activated sludge from the secondary sedimentation tank of Qinghe Municipal Wastewater Plant into the reactor, and the sludge concentration is about 4000mg / L. The COD concentration of raw sewage is 350-400mg / L, the ammonia nitrogen concentration is 50-60mg / L, and the total phosphorus concentration is 5-8mg / L.

[0032] 60% of the raw sewage enters the anaerobic reactor, and 40% directly enters the first aerobic reactor. The total hydraulic retention time of the system is 11 hours, the DO of the first aerobic reactor is controlled at 1.50 mg / L, the pH is controlled at about 8.0, the DO of the second aerobic reactor is controlled at 0.3 mg / L, and the DO in the rapid aeration tank is controlled at 5.0 mg / L, the sedimentation time is 0.50h, and the sludge reflux ratio of the sedimentation tank is 70%. After one month of process operation, the system nitrosation rate reaches 60%, the effluent ammonia nitrogen is within 5mg / L, the effluent COD is within 20mg / L, ...

Embodiment 3

[0034] Inoculate the activated sludge from the secondary sedimentation tank of Qinghe Municipal Wastewater Plant into the reactor, and the sludge concentration is about 4000mg / L. The COD concentration of raw sewage is 350-400mg / L, the ammonia nitrogen concentration is 50-60mg / L, and the total phosphorus concentration is 5-8mg / L.

[0035] 50% of the raw sewage enters the anaerobic reactor, and 50% directly enters the first aerobic reactor. The total hydraulic retention time of the system is 10h, the DO of the first aerobic reactor is controlled at 1.30mg / L, the pH is controlled at about 8.0, the DO of the second aerobic reactor is controlled at 0.3mg / L, and the DO in the rapid aeration tank is controlled at 4.0mg / L, the sedimentation time is 0.50h, and the sludge reflux ratio of the sedimentation tank is 80%. After one month of process operation, the system nitrosation rate reaches 50%, the effluent ammonia nitrogen is within 5mg / L, the effluent COD is within 20mg / L, and the ...

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Abstract

The invention relates to a short-range denitrification in-phase denitrification dephosphorization process and a device thereof and pertains to the technical field of sewage treatment. The flow of the process is anaerobic process, aerobic process, hypoxia, rapid aeration and sedimentation tank. Divided-flow water inlet is adopted, a part of raw water enters an anaerobic reactor and a part enters a first aerobic reactor. A part of water outlet of the anaerobic reactor enters the first aerobic reactor, and a part enters a first hypoxia reactor. A rapid aeration tank is arranged behind a hypoxia reactor, and the water outlet enters the sedimentation tank. By controlling the way of water inlet and the concentration of dissolved oxygen in the aerobic reactor, the process can finish short-rang nitration denitrification in the aerobic reactor under the condition of normal temperature, accumulation of nitrite can be realized, denitrification dephosphorization that nitrite is electron acceptor is finished in the hypoxia reactor. The process can realize short-range nitration and denitrification dephosphorization that nitrite is electron acceptor under the condition of normal temperature and maximally realize energy saving and consumption reduction of sewage treatment.

Description

technical field [0001] The invention belongs to the fields of environmental protection and sewage treatment. It specifically relates to a process and device for short-range nitrification and simultaneous denitrification phosphorus removal. Background technique [0002] The basic principle of short-cut nitrification and denitrification biological nitrogen removal is to control the nitrification process in the nitrite stage and prevent NO 2 - further nitrification and then direct denitrification. The advantages of short-range nitrification and denitrification are: the reaction process is shortened, the denitrification rate of nitrite nitrogen is higher than that of nitrate nitrogen, and the denitrification rate is accelerated; the hydraulic retention time is shortened, and the reaction vessel is correspondingly reduced; the oxygen demand is reduced. 25%, reduce energy consumption; save 40% denitrification carbon source; reduce excess sludge discharge, short-range nitrificat...

Claims

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Application Information

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IPC IPC(8): C02F3/30
Inventor 黄霞支霞辉薛涛
Owner TSINGHUA UNIV
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