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Low-oxygen aeration control device and method for subsection water inflow A/O biological denitrification technique

A technology of biological denitrification and low oxygen aeration, which is applied to the low oxygen aeration control device of the staged influent A/O biological denitrification process and its field, can solve the problems of sensitive load changes, large energy consumption for aeration, waste of energy and the like , to achieve the effect of avoiding insufficient aeration and avoiding over-aeration

Active Publication Date: 2007-08-08
BEIJING UNIV OF TECH
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Problems solved by technology

After adopting this control method, it can solve the problem of ① the traditional way of aeration consumes a lot of energy and wastes energy
② Effectively solve the problem that the low DO system is sensitive to load changes

Method used

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  • Low-oxygen aeration control device and method for subsection water inflow A/O biological denitrification technique
  • Low-oxygen aeration control device and method for subsection water inflow A/O biological denitrification technique

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Embodiment Construction

[0035] In combination with the embodiments, the method for controlling low oxygen aeration of the present invention is:

[0036] Take the actual domestic sewage discharged from the family area of ​​a university as the experimental object (COD=140~290mg / L, TN=35~80mg / L). The adopted multi-stage influent A / O biological denitrification reactor dissolves 300L and is divided into 3 stages, each with a volume of 100L. The system is equipped with 3 air compressors, the maximum air output is 2m3 / h, and the minimum air output is 0. The reactor first carries out sludge culture and domestication. After the domestication, the sludge concentration of each stage is: the first stage is 5~5.5g / L, the second stage is 4~4.5mg / L, and the third stage is 2.8~3.2mg / L. L. The daily treatment water volume of the reactor is 900L, the first stage water intake is 11.2L / h, the second stage water intake is 15L / h, and the third stage water intake is 11.2L / h. The reaction temperature is 20°C.

[0037] At the be...

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Abstract

The invention discloses a low-oxygen aerating control device and method of segment inlet A / O biological denitrifying technique, which contains three control circuits, wherein the first and second circuits adopt DO cascade PI control system; the third circuit uses higher-precision ammonia nitrogen feedforward-feedback control system, which gathers DO density, ammonia nitrogen density of aerobic area and ammonia nitrogen density of last anoxybiotic area to reflect the change of inlet load.

Description

Technical field [0001] The present invention relates to a process and device for biological denitrification treatment of nitrogen-containing wastewater by continuous flow segmentation. The technical field belongs to: the theory, method and technology of automatic control of activated sludge sewage treatment system. It is suitable for the deep denitrification of large, medium and small town domestic sewage and nitrogen-containing industrial wastewater. Background technique [0002] The staged water biological denitrification process is a new process developed based on the traditional pre-denitrification process (A / O). This process usually does not need to set up nitrification liquid internal recirculation facilities. Compared with ordinary denitrification and phosphorus removal processes, this process usually has more sludge reserves and longer SRT, and has the advantages of smaller pool capacity, high denitrification efficiency, and convenient operation and management. However, d...

Claims

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Application Information

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IPC IPC(8): C02F3/30
Inventor 彭永臻王伟王淑莹
Owner BEIJING UNIV OF TECH
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