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Aeration control system and aeration control method

A control system and aeration technology, applied in general control systems, control/regulation systems, electrical program control, etc., can solve problems that have little effect, have not been fully popularized, and require hours or even days

Active Publication Date: 2016-11-09
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

[0073] 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;

[0074] Calculate the required oxygen supply according to the expected dissolved oxygen concentration, actual dissolved oxygen concentration and oxygen consumption rate (OUR) value;

[0075] Evaluate the performance of the aeration system according to the actual aeration volume, OTE and other correction parameters;

[0076] First write the control program into the PLC control unit 10, when the aeration control system starts to operate, the dissolved oxygen (DO) measuring instrument 5 measures the DO concentration in the sewage in real time, and sends it to the PLC control unit 10 through the data signal transmission line 9, and the PLC control unit 10 Simultaneously integrate the data fed back by the OUR measuring instrument 2 and the OTE measuring instrument 3 to c...

Embodiment 2

[0081] The volume of the aeration tank is 0.25m 3 , Since the measurement period of the OUR measuring instrument is 15 minutes, the control period is set to 15min, SOTE=20%, SOTR=0.03kg / h, k=0.75, θ=0.888, C * ∞20 is the saturated dissolved oxygen value at 20°C;

[0082] The initial setting value of dissolved oxygen is 2. The aeration control can be started after the OUR meter, OTE meter, DO meter and aeration system are all connected to the PLC. The OUR meter measures a value every 15 minutes, while the OTE And the DO measuring instrument is real-time measurement, each change of the three values ​​of OUR, OTE, DO will be transmitted to the PLC control cabinet through the signal transmission line, and the actual required air volume will be calculated, and the command will be transmitted to the flow control valve by changing its opening. The speed reaches the command value, and the actual air volume value is displayed on the signal screen through the signal line.

[0083] Si...

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Abstract

The invention discloses an aeration control system. The system comprises a data acquiring unit, a PLC unit and an aeration unit, wherein the data acquiring unit comprises an OUR determinator, an OTE determinator and a DO determinator; and the aeration unit comprises an air blower, a micropore aeration head and a flowmeter. The invention further provides a method for controlling aeration by using the aeration control system, system automatic control software calculates the amount of aeration required to be supplied according to an OUR value, an OTE value and a DO value which are acquired automatically in an online manner, then signals are output to change air blowing flow, DO is guaranteed to be maintained at a set value stably, deviation does not exceed 0.5 mg / L, supply and demand dynamic balance of oxygen is realized, the problem of poor water quality caused by insufficient oxygen supply can be solved, energy waste due to excessive aeration can also be reduced, and meanwhile, a function of evaluating the performance of the aeration system is fulfilled.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to an aeration control system and an aeration control method. Background technique [0002] Compared with developed countries, the energy efficiency of my country's urban sewage treatment is low, and the problem of high energy consumption is prominent; in 2012, the total power consumption of my country's sewage treatment industry was as high as 12.5 billion kWh, and the unit power consumption was 0.29 kWh / m 3 , the average power consumption of the sewage treatment industry in the United States is 0.32kWh / m 3 , but the average influent pollutant concentration of sewage treatment plants in my country is about 2 / 3 of that in the United States, and the overall effluent water quality standard is far lower than that in the United States, and more than 80% of the sludge has not been treated except for dehydration. With the implementation of standard upgrading and transformation in various ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12G05B19/05
CPCC02F3/1205C02F3/1236C02F2209/005C02F2209/22G05B19/054Y02W10/10
Inventor 罗涛
Owner 尚川(北京)水务有限公司