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Method and device for controlling synchronous nitration and denitrification in surface aeration oxidation ditch process

A technology of synchronous nitrification and control devices, applied in the field of biological denitrification, can solve the problems of low environment, difficult to control, excessive energy consumption, and low efficiency of total nitrogen removal, so as to save energy consumption, increase operating time, and solve the problem of sewage denitrification The effect of unstable nitrogen efficiency and low compliance rate

Inactive Publication Date: 2012-06-20
中节能国祯环保科技股份有限公司 +1
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Problems solved by technology

[0038] The purpose of the present invention is to provide a surface aeration oxidation ditch process synchronous nitrification and denitrification control method and device to solve the problem of low total nitrogen removal efficiency and excessive energy consumption in the biological denitrification process caused by excessive aeration in the surface aeration oxidation ditch process problems, and overcome the problem of low DO in the simultaneous nitrification and denitrification environment, which is difficult to control, so as to achieve efficient and stable control of the simultaneous nitrification and denitrification biological denitrification process

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  • Method and device for controlling synchronous nitration and denitrification in surface aeration oxidation ditch process
  • Method and device for controlling synchronous nitration and denitrification in surface aeration oxidation ditch process

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Embodiment 1

[0057] Taking the effluent from the aeration grit chamber of a sewage treatment plant in Hefei as the raw water, the influent COD, ammonia nitrogen, total nitrogen and total phosphorus values ​​(COD=180.2~320.3mg / L, NH 4 + =20.5~32.7mg / L, TN=26.7~45.2mg / L, TP=1.4~4.9mg / L). The hydraulic retention time (HRT) of anaerobic tank, anoxic tank and oxidation ditch is 0.5h, 1.5h and 12h respectively, and the reflux ratio of excess sludge (the ratio of excess sludge flow to influent flow) is 60% to 100%. , The reflux ratio of the nitrifying liquid (the ratio of the flow rate of the nitrifying liquid to the flow rate of the influent water) is 40-80%. Using ammonia nitrogen and DO as the control parameters of simultaneous nitrification and denitrification (SND) biological denitrification (SND) in the oxidation ditch process, a control experiment was carried out on the process SND. Adjust the opening of the surface aerator according to the readings of the DO online monitor and the ammon...

Embodiment 2

[0059] Taking the effluent from the aeration grit chamber of a sewage treatment plant in Beijing as the raw water, the influent COD, ammonia nitrogen, total nitrogen and total phosphorus values ​​(COD=270~430mg / L, NH 4 + =36.5~53.2mg / L, TN=51.4~63.5mg / L, TP=5.4~8.0mg / L). The hydraulic retention time (HRT) of the anaerobic tank, the anoxic tank and the oxidation ditch are 70 minutes respectively, the volume reflux ratio of the remaining sludge at 120 minutes and 20 hours is 100-120%, and the reflux ratio of the nitrifying liquid is 80-100%. Using ammonia nitrogen and DO as the control parameters of simultaneous nitrification and denitrification (SND) biological denitrification (SND) in the oxidation ditch process, the control test of the process SND was carried out, and the opening of the surface aerator was adjusted according to the readings of the DO online monitor and the ammonia nitrogen online monitor. , if DO>1.5mg / L and effluent ammonia nitrogen4mg / L; if ammonia nitroge...

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Abstract

The invention discloses a method and a device for controlling synchronous nitration and denitrification in a surface aeration oxidation ditch process, and relates to the technical field of biological denitrification of domestic sewage. The conventional surface aeration oxidation ditch process has the problems that removal rate of total nitrogen is low, energy consumption is high, and environment of synchronous nitration and denitrification is hardly controlled. Dissolved oxygen (DO) and ammonia nitrogen at the water outlet of an oxidation ditch aeration basin are monitored by DO and ammonia nitrogen on-line monitors, the turn-on and turn-off of a reverse umbrella surface aerator and a water impeller are controlled by indication of an on-line instrument, organic matter in the aeration basin is oxidized by fully using nitrate nitrogen, excessive aeration is avoided simultaneously, and double aims of energy saving and high-efficiency denitrification are fulfilled.

Description

technical field [0001] The invention discloses a surface aeration oxidation ditch process synchronous nitrification and denitrification control technology and device, and relates to the technical field of denitrification of domestic sewage, in particular a kind of biological denitrification. Background technique [0002] Oxidation ditch technology [0003] Oxidation ditch, also known as continuous loop reactor, is a process of activated sludge process. Oxidation ditch was originally applied in the Netherlands, and now it has become an important sewage treatment technology in Europe, Oceania, South Africa and North America. In recent years, the speed of adopting oxidation ditch treatment plants has made rapid progress. At present, the number of sewage treatment plants in my country's oxidation ditch process is growing more rapidly, and it is widely used in Hunan, Jiangxi, Henan, Anhui, Chongqing and other provinces and cities. [0004] Oxidation ditch has a special hydraul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F3/14
CPCY02W10/10
Inventor 侯红勋王淦陈立爱
Owner 中节能国祯环保科技股份有限公司
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