Aeration control system and aeration control method

A technology of control system and control method, applied in the direction of water aeration, water treatment parameter control, chemical instruments and methods, etc., can solve the problems that have not been fully popularized, need hours or even days, and are expensive

Active Publication Date: 2017-02-22
尚川(北京)水务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The basic principle of aeration control using water quality indicators as feed-forward is to calculate the amount of oxygen that needs to be provided through the concentration of pollutants. However, most of the sewage water quality indicators rely on experimental measurements, and the measurement time takes hours or even days. This has an impact on real-time control. not big
Online water quality testing instruments also have a delay of several hours, are expensive, and have not yet been fully popularized

Method used

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  • Aeration control system and aeration control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] Set the desired dissolved oxygen concentration. The set dissolved oxygen value is to make the actual aeration amount as close or consistent as possible to the expected value by changing the aeration amount;

[0103] Adjust the air volume of the blower according to the change of oxygen transfer efficiency (OTE) and the change of DO actual value;

[0104] The fan is adjusted according to the aeration rate described.

[0105] First, the control program algorithm is written into the control unit 103 through software. When the aeration control system starts to operate, the DO detector 1022 measures the DO concentration in the sewage in real time, and sends it to the control unit 103 through the Profibus communication line. The control unit 103 will dissolve according to the actual situation. The difference between oxygen and the set dissolved oxygen selects the control mode, integrates the real-time feedback data of the OTE meter 1021 and the DO meter 1022, calculates the re...

Embodiment 2

[0109] Taking Sequencing Batch Reactor Activated Sludge Process (SBR) as an example, the effective volume of the aeration tank is 82.5m 3 , the effective water depth is 3.3m, the set value of C=2.0mg / L, the t control period is 10 minutes, [O 2 air] is the density of oxygen in the air is 0.28kg / m 3 ;

[0110] Taking Siemens 300 series programmable logic controller (Programmable Logic Controller, PLC) as an example, it is composed of special software modules and function modules.

[0111] In particular, in order to improve the reliability and flexibility of system transmission, the system uses a Profibus communication line with a faster transmission rate to connect the system in series;

[0112] In particular, the hood is made of lightweight rubber material combined with steel material;

[0113] In particular, the aerator adopts a microporous aerator with a pore size of 50-100 μm.

[0114] The initial setting value of dissolved oxygen is 2mg / L. After connecting the OTE meter...

Embodiment 3

[0119] At 5 minutes after aeration, when OTE=0.15, if the set value of DO=2.0mg / L, the actual value of DO=1.0mg / L, K La =0.371min -1 , α=0.48, C saturation value=8.41mg / L, β=0.89, t control period=10min, T=24℃, oxygen density in air is 0.28kg / m 3 , then Q=161.35m 3 / h;

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Abstract

The invention discloses an aeration control system and an aeration control method. The aeration control system comprises an aeration tank, a data acquisition unit, a control unit and an aeration unit. The data acquisition unit comprises an oxygen transfer efficiency measuring instrument and a dissolved oxygen measuring instrument; the oxygen transfer efficiency measuring instrument comprises a gas collecting cover and a tail gas delivering tube; real-time oxygen transfer efficiency values can be transmitted to the control unit by the oxygen transfer efficiency measuring instrument via a signal wire; one end of the tail gas delivering tube is connected with the top of the gas collecting cover, and the other end of the tail gas delivering tube is connected with the oxygen transfer efficiency measuring instrument; the dissolved oxygen measuring instrument is connected with the control unit; the oxygen transfer efficiency measured by the oxygen transfer efficiency measuring instrument and the dissolved oxygen concentration measured by the dissolved oxygen measuring instrument can be transmitted to the control unit; a blower can be adjusted by the control unit according to the transmitted oxygen transfer efficiency and the transmitted dissolved oxygen concentration. The aeration control system and the aeration control method have the advantage that the internal aeration rate of the aeration tank can be precisely controlled by the aid of the aeration control system and the aeration control method.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to an aeration control system and method. Background technique [0002] The aeration system is a very important part of the sewage treatment industry. It consumes a lot of energy, accounting for more than half of the total power consumption of the sewage plant operation. It also shows that there is a lot of room for energy saving in this part. In my country, due to design or process reasons, a considerable part of the aeration system of sewage treatment plants has the problem of excessive energy consumption, mainly manifested in the inaccurate control of the air supply volume, and is basically in a state of excessive aeration, resulting in the failure of the aeration system Increased energy consumption. [0003] my country's aeration control started late, and many sewage plants still use a combination of manual operation and automatic monitoring. At present, domestic aeration contro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F7/00G06F19/00
CPCC02F7/00C02F2209/22G16Z99/00Y02W10/10
Inventor 罗涛
Owner 尚川(北京)水务有限公司
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