COD (chemical oxygen demand) control method for SBR (sequencing batch reactor) biochemical reaction tank

Abstract

The invention discloses a COD (chemical oxygen demand) control method for an SBR (sequencing batch reactor) biochemical reaction tank, and is characterized in that: a mathematical model, shown in thespecification, of the SBR biochemical reaction tank is measured by a phase step experiment; an object recognition system monitors whether Ko, To, and Tauo fluctuate within plus or minus 30% of an original value, so as to judge whether the current SBR biochemical reaction tank is in a normal working condition; if the object recognition system monitors that the obtained Ko, To and Tauo fluctuate within plus or minus 30% of the original value, a PID controller controls a variable frequency fan to work, otherwise, a robust PID controller controls the variable frequency fan to work. The COD controlmethod for the SBR biochemical reaction tank solves the technical problem of improving the accuracy of COD control of the SBR biochemical reaction tank, and has the advantages of high precision of COD control, good control stability and the like compared with the prior art.

Description

technical field [0001] The invention relates to a COD control method, in particular to a COD control method of an SBR biochemical reaction tank. Background technique [0002] SBR is the abbreviation of Sequenced Batch Activated Sludge Process, which is an activated sludge sewage treatment technology operated by intermittent aeration. The core of SBR technology is the SBR reaction tank, which integrates homogenization, primary sedimentation, biodegradation, secondary sedimentation and other functions into one tank, without sludge return system. It is especially suitable for occasions with intermittent discharge and large flow changes. [0003] COD (Chemical Oxygen Demand) is a chemical method to measure the amount of reducing substances that need to be oxidized in a water sample. The oxygen equivalent of substances (generally organic matter) that can be oxidized by strong oxidants in wastewater, wastewater treatment plant effluent and polluted water. In the study of river ...

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Problems solved by technology

[0006] The core content of the COD control method of the traditional SBR biochemical reaction tank is to use the PID controller to control the frequency conversion fan to provide aeration to the SBR biochemical reaction tank. Considering the worst working condition of the PID controller, that is, the temperature of the SBR biochemical reaction tank and When the external environment such as humidity fluctuates violently, the control effect of the above-mentioned PID controller is relatively poor, which affects the control accuracy of the COD control method of the SBR biochemical reaction tank

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