A kind of do intelligent control method of sewage plant

Abstract

The invention provides a DO intelligent control method of a sewage plant, which specifically includes the following steps: firstly, the OUR instrument is placed at the end of the anoxic pool and close to the entrance of the aerobic pool, and the OUR instrument detects the oxygen consumption respiration rate value of the sewage in real time ; Then the control system uses the formula to convert the OUR value into the air demand according to the OUR detection value and the DO setting value of the aerobic tank; finally the control system transmits the air demand signal to the blower control system and adjusts the blower output air volume; The system adjusts the opening of the corresponding valve according to the difference between the measured value of the DO meter in the aerobic pool and the set value of DO in the aerobic pool; Within the range, it can be considered that the DO adjustment is in place; if the difference is not within the error range, fine-tune the gas demand signal. The control method in this application overcomes external interference factors, contributes to the stable operation of the system, shortens the time lag of the system, and prolongs the service life of the system.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a DO intelligent control method of a sewage plant. Background technique [0002] Traditional sewage treatment plants that use bottom aeration generally adjust the aeration volume of the blower based on experience. This control method relies on manual experience and cannot perform real-time online control according to fluctuations in influent water quality and water volume, resulting in blower operation. High energy consumption and unstable effluent quality. In recent years, various precision aeration or control systems for precise aeration have been continuously pushed to the market. These aeration control systems are either based on the single-stage or multi-stage linkage PID control of the blower to the DO meter or the ammonia nitrogen online detector, or based on the activated sludge mathematical model ASM to simulate and calculate the aeration amount according to the quality ...

AI Technical Summary

Problems solved by technology

For the former, because the sewage biochemical treatment system is a system with a large time lag, it is difficult to adjust the PID in place in the shortest time, resulting in repeated periodic oscillations of the control system, making it difficult to achieve the control target and reduce the service life of the equipment; for the latter On the one hand, the ASM model mechanism itself is still under development, and the model itself has many parameters, while the sewage treatment system is a complex and changeable system, too many external interference factors are not conducive to the stable operation of the control system

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