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Sewage water denitrification handling method

A treatment method and sewage technology, which is applied in the field of biological denitrification treatment of sewage, can solve the problems of difficult nitrification reaction, increased energy consumption, and increased floor area, so as to achieve high biochemical reaction rate, avoid activity inhibition, and occupy an area The effect of less area

Inactive Publication Date: 2008-01-16
HUAZHONG UNIV OF SCI & TECH
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  • Description
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Problems solved by technology

However, this method is not effective for the treatment of chemical oxygen demand (COD), ammonia nitrogen (NH 3 - Sewage with high content of N) has poor denitrification effect
[0003] The first reason is that the content of organic matter in the raw water is too high. Although some dissolved organic matter can be adsorbed and degraded in the pre-denitrification section, the concentration of organic matter is still high, so that in the aerobic stage, the heterogeneous species with a faster proliferation rate The trophic bacteria reproduce rapidly, while the autotrophic nitrifying bacteria do not get the advantage, and the nitrification reaction is difficult to proceed smoothly
In order to solve this problem, the usual practice is to increase the hydraulic retention time of the aerobic section to reduce the organic matter content in the sewage and meet the conditions of nitrification reaction, which will inevitably increase energy consumption and increase the area occupied
The second is that the activated sludge in the A / O method is continuously in the dynamic process from aerobic to anoxic and from anoxic to aerobic, the activity will be inhibited to a certain extent, so that the biochemical reaction efficiency is low

Method used

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  • Sewage water denitrification handling method

Examples

Experimental program
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Effect test

Embodiment 1

[0047] The water quality of a public toilet septic tank is as follows:

[0048] project

[0049] Carry out as shown in accompanying drawing 1, be 2 hours in denitrification tank hydraulic retention time, be 6 hours in carbon oxidation tank hydraulic retention time, be 3 hours in nitrification tank hydraulic retention time, the first settling tank flows back into the carbon oxidation tank The reflux ratio is 75%, the reflux ratio of the second sedimentation tank back into the denitrification tank is 150%, the residence time of the first sedimentation tank is 2 hours, and the residence time of the second sedimentation tank is 3 hours. The carbon oxidation tank is suspended activated sludge, the sludge concentration is 4g / L, the sludge age is 4 days, and the water temperature is 18°C. This method can make COD, BOD 5 , NH 3 -N removal rate is above 95%. The treated water can be used as non-contact reuse water after disinfection, or discharged after further treatment. ...

Embodiment 2

[0051] The water quality of a septic tank sewage is as follows:

[0052] project

[0053] Carry out as shown in accompanying drawing 1, be 3 hours in denitrification tank hydraulic retention time, be 10 hours in carbon oxidation tank hydraulic retention time, be 6 hours in nitrification tank hydraulic retention time, the first settling tank flows back into carbon oxidation tank The reflux ratio is 100%, the reflux ratio of the second sedimentation tank back into the denitrification tank is 300%, the residence time of the first sedimentation tank is 3 hours, and the residence time of the second sedimentation tank is 4 hours. Put suspended activated sludge in the carbon oxidation tank, the sludge concentration is 4g / L, the sludge age is 3 days, and the water temperature is 20°C; the sludge concentration in the nitrification tank is 5g / L, the sludge age is 30 days, and the water temperature is 20°C ℃. This method can make COD, BOD 5 , NH 3 -N removal rates are above...

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Abstract

The present invention discloses one kind of sewage denitriding process, and the sewage denitriding process includes the steps of denitrifying, depositing, oxycarbonizing, re-depositing and nitrifying. The present invention separates the aerobic section into the oxycarbonizing step and the nitrifying step, and this creates suitable habitat for both heterotrophic bacteria and autotrophic nitrifying bacteria and biochemical reaction in high speed. There is no mixing of sludge of different steps, and this can ensure the high activity of active sludge. The process of the present invention is suitable for treating high COD and high ammonia nitrogen sewage, especially sewage from public latrine. Compared with A / O process, the process of the present invention has the advantages of low power consumption, small covered area and high denitriding efficiency.

Description

technical field [0001] The invention belongs to a new method for biological denitrification treatment of sewage, in particular to a treatment method for denitrification A / O / N (Anoxic-Oxic-Nitrifying) of sewage, which is especially suitable for the treatment of public toilet sewage. Background technique [0002] At present, the more popular biological denitrification method in sewage treatment is the A / O (Anoxic-Oxic) method pioneered in the early 1980s; its main feature is that the denitrification section is placed at the head of the treatment process, so it is also called the former Set up denitrification biological nitrogen removal treatment method. However, this method is not effective for the treatment of chemical oxygen demand (COD), ammonia nitrogen (NH 3 -N) content of wastewater with high content, the denitrification effect is not good. [0003] The first reason is that the content of organic matter in the raw water is too high. Although some dissolved organic matt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30
Inventor 刘年丰侯红勋杨群张杰龚时琼
Owner HUAZHONG UNIV OF SCI & TECH
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