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Method for aerobic synchronous nitration and denitrification of coking wastewater

A technology for simultaneous nitrification and coking wastewater, applied in the field of wastewater treatment to reduce surface load, reduce power consumption and improve treatment capacity

Inactive Publication Date: 2011-01-19
ANYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The feasibility of this method is only theoretically discussed, and it has not been applied to large-scale industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: When the sludge volume in the aerobic tank was 22%, the cultivation of nitrifying bacteria was started, and by controlling the pH of the aerobic tank to 7.2, the temperature at 30°C, and the dissolved oxygen at 3.6 mg / l, sodium dihydrogen phosphate was added to ensure that the two The phosphorus content in the effluent of the sedimentation tank is greater than 0.5mg / l, and the water inflow of the control system is 30m 3 / h, at this time, the COD of the secondary sedimentation effluent is about 150mg / l, and it has been running for about half a month to monitor the NH of the secondary sedimentation tank effluent 3 -N 3 / h; After the water volume increases, add activated carbon powder to the aerobic tank, and monitor the COD of the secondary sedimentation tank at the same time. When the COD is less than 250mg / l, no sludge is discharged, and when it is greater than 250mg / l, a small amount of sludge is discharged to maintain the secondary sedimentation tank. Th...

Embodiment 2

[0022] Embodiment 2: when the sludge volume in the aerobic pond was 25%, keep pH7.5, temperature 30 DEG C, dissolved oxygen 4.2mg / l in the pond, all the other control conditions are the same as example 1, after running for a period of time, the nitrifying bacteria are cultivated successfully, After the successful cultivation of nitrifying bacteria, add activated carbon powder to the aerobic tank to ensure that the effluent COD3 / h, at the same time reduce the air volume of the aerobic pool, and control the dissolved oxygen in the aerobic pool to 2.0mg / l. At this time, the total nitrogen in the monitoring water inflow and outflow indicators is 131.6mg / l, the total nitrogen in the effluent is 47.8mg / l, and the total nitrogen removal rate 78.9%, proving that the aerobic pool synchronous nitrification and denitrification system was successfully cultivated.

Embodiment 3

[0023] Embodiment 3: In the nitrifying bacteria culture process, control pH8.4, temperature 32 ℃, dissolved oxygen 5.0mg / l, all the other conditions are the same as implementation 1, after the nitrifying bacteria culture is successful, through the same control conditions as implementation 1 make good After the sludge volume in the oxygen tank increases to 76%, gradually increase the water volume to 74m 3 / h, control the dissolved oxygen in the aerobic pool to 2.5mg / l, and run it for a short period of time. By monitoring the total nitrogen concentration in the influent and effluent water of the aerobic pool, it is found that when the total nitrogen in the influent is 183.4mg / l, the effluent is 70.1mg / l , the total nitrogen removal rate was 61.9%, which proved that the simultaneous nitrification and denitrification system in the aerobic pool was successfully cultivated.

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Abstract

The invention discloses a method for treating coked wastewater through aerobic and synchronous nitrification and denitrification. Firstly, through culture of nitrobacteria, water comes out from an aerobic pool; NH3-N is less than 1 mg / l; secondly, the volume of sludge is improved so as to increase the volume of sludge of the aerobic pool to 50 to 80 percent; and finally the concentration of dissolved oxygen is reduced; and the concentration of the dissolved oxygen of the aerobic pool is reduced from 3 to 6 mg / l to 1 to 3 mg / l. Mass experiment results show that by a method of reducing the concentration of the dissolved oxygen and improving the volume of the sludge of the aerobic pool, the sludge surface has nitrification reaction in an aerobic state; as the inside of the sludge has thickerfloccule, the dissolved oxygen can not penetrate to the inside of the sludge, and the sludge is in an anaerobic state to form denitrification reaction; the removing rate of ammonia nitrogen reaches over 95 percent; the removing rate of total nitrogen reaches 70 percent around; and the method reduces investment, reduces energy consumption and keeps the stable quality of outlet water.

Description

Technical field: [0001] The invention relates to the field of wastewater treatment, in particular to the industrialized treatment of coking wastewater. Background technique: [0002] Coking wastewater is a typical high-ammonia-nitrogen industrial wastewater containing refractory organic pollutants. In addition to high ammonia-nitrogen content, it also contains a variety of aromatic hydrocarbons and heterocyclic organic compounds. The composition is very complex and difficult to treat. Most coking plants in China adopt A / O and A / A / O two processes for biological denitrification of coking wastewater, of which the A section mostly adopts the biofilm method, and the O section adopts the activated sludge method. Since the aerobic and autotrophic characteristics of nitrifying bacteria are significantly different from the anoxic and heterotrophic characteristics of denitrifying bacteria, nitrification and denitrification are different in O section (aerobic pool) and A section (anox...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30
Inventor 张纪民高俊宋英臣赵士东冯海军崔保华王东锋赵朝立
Owner ANYANG IRON & STEEL
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