Aeration rate control method and system

Abstract

The invention provides an aeration rate control method and system. The method comprises the following steps: setting an expected dissolved oxygen concentration, calculating first oxygen transfer ratio on the basis of parameters of the aeration device according to the difference between the actual dissolved oxygen concentration and expected dissolved oxygen concentration, determining the aeration rate increment/decrement capable of enabling the actual dissolved oxygen concentration to reach the expected dissolved oxygen concentration according to the difference between the expected dissolved oxygen concentration and actual dissolved oxygen concentration, the oxygen consumption absorption rate and the first oxygen transfer ratio, determining the aeration rate control parameters according to the aeration rate increment/decrement, and adjusting the aeration rate according to the aeration rate control parameters. Therefore, according to the aeration rate control method and system, the difference between the expected dissolved oxygen concentration and actual dissolved oxygen concentration, the oxygen consumption absorption rate and the first oxygen transfer ratio are utilized to determine the aeration rate increment/decrement capable of enabling the actual dissolved oxygen concentration to reach the expected dissolved oxygen concentration, thereby implementing the real-time accurate adjustment on the aeration rate. Thus, the sewage treatment effect is more stable and effective.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an aeration control method and system. technical background [0002] In the current field of sewage treatment, the biological method is the most widely used, that is, by artificially maintaining an aerobic, anoxic or anaerobic environment, the microorganisms in the biological pool can continue to undergo specific biochemical reactions according to the needs to reduce the concentration of target pollutants. Such as reducing the concentration of BOD5, COD, TP, TN and other pollutants in the water, so as to achieve discharge standards. The aeration rate is the primary factor affecting the effect of biological treatment. The control level of aeration rate determines the treatment effect of sewage to a large extent, and it is also the most important energy consumption unit, generally accounting for 45% of the energy consumption of the plant—— 70%. In practical application, ...

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Problems solved by technology

This control idea has two defects: first, the accuracy of the calculation results depends on whether the collected signals are sufficient and accurate, whether the identification of water quality proportional parameters is accurate, whether the identification of biochemical kinetic parameters is accurate, and whether the efficiency setting of oxygenation equipment is accurate and many other factors. Second, the accuracy of the execution of the calculation results is affected by the execution control logic level, and the time-lag effect of the DO signal cannot be properly resolved. Therefore, it is difficult to guarantee the stability and control of DO.

[0007] In summary, the aeration rate control methods in the prior art are difficult to achieve stable control of DO (dissolved oxygen concentration) in the water body, and the sewage treatment effect is difficult to meet expectations

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