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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 staged water intake, applied to the low-oxygen aeration control device and its field of the staged water intake A/O biological denitrification process, can solve the problems of high energy consumption for aeration, sensitivity to load changes, and waste of energy, etc., to achieve Avoid over-aeration, avoid the effect of under-aeration

Active Publication Date: 2010-08-11
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
  • Low-oxygen aeration control device and method for subsection water inflow A/O biological denitrification technique

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Embodiment Construction

[0035] In conjunction with embodiment, the method for hypoxic aeration control of the present invention is:

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

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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 invention relates to a process and device for continuous-flow segmental inflow biological denitrification treatment of nitrogen-containing wastewater, and belongs to the technical field of the theory, method and technology of automatic control of activated sludge sewage treatment system. It is suitable for deep denitrification of domestic sewage and nitrogen-containing industrial wastewater in large, medium and small cities. Background technique [0002] The stage-influent 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 reflux facilities in the nitrifying liquid. Compared with ordinary nitrogen and phosphorus removal processes, this process usually has more sludge reserves and longer SRT, and has the advantages of smaller required tank volume, high nitrogen removal efficiency, and convenient operation and management. However, due...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30
Inventor 彭永臻王伟王淑莹
Owner BEIJING UNIV OF TECH
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