Regulation method for online optimizing aeration rate based on data assimilation

Abstract

The invention discloses a regulation method for online optimizing the aeration rate based on data assimilation. The method comprises the following steps: S1, simulating a model: simulating the transfer rate of dissolved oxygen by using an aeration kinetic model in order to simulate a dissolved oxygen concentration; S2, online measuring: online measuring an actual dissolved oxygen concentration byusing a dissolved oxygen measuring sensor; S3, assimilating data: carrying out data assimilation on the simulated dissolved oxygen concentration and the actual dissolved oxygen concentration to obtainan optimized aeration parameter; S4, substituting the parameter: substituting the optimized aeration parameter into the kinetic model of an aeration device; S5, online regulating: using the optimizedkinetic model to carry out online aeration rate regulation. The method can link the change of the actual dissolved oxygen with the kinetic model of the aeration and a dissolved oxygen diffusion model, so the method improves the adjustment precision of the aeration and has a great application prospect.

Description

technical field [0001] The invention relates to the technical field of computer algorithm regulation and control of the environment, in particular to a control method for online optimization of aeration volume based on data assimilation. Background technique [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 ...

AI Technical Summary

Problems solved by technology

In practical application, if the aeration system is not properly operated, the aeration volume is too small, the nitrification reaction in the aerobic section is inhibited, and the ammonia nitrogen value of the effluent is likely to fail to meet the standard; when the aeration volume is too large, in addition to the additional operating costs, the high Intensive aeration and agitation will break up the sludge flocs, affect the sludge settlement in the secondary settling tank, and then affect the water outlet effect; Occurrence of nitrification reaction, resulting in substandard effluent TN and unnecessary waste of carbon source

[0003] In the process of sewage treatment, the control of aeration rate is affected by many factors. It is a fast time-scale variable, and its dynamic characteristics are nonlinear and time-varying. Therefore, simple control strategies or control methods that rely too much on instruments are difficult to meet the aeration Quantity Control Requirements

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