MBR (membrane biological reactor) aerobic tank aeration control method and control system

Abstract

The invention discloses an MBR (membrane biological reactor) aerobic tank aeration control method and control system, wherein the method comprises the following steps of collecting an ammonia-nitrogen concentration signal of a membrane tank; obtaining a first residue difference value between the ammonia-nitrogen concentration signal and the preset ammonia-nitrogen concentration value; obtaining the preset dissolved oxygen concentration value of an aerobic tank through a first-order PI (proportional-integral) algorithm; collecting the dissolved oxygen concentration signal of the aerobic tank; obtaining a second residue difference value between the dissolved oxygen concentration signal and the preset dissolved oxygen concentration value; obtaining an aerobic tank aeration quantity value through a second-order PI algorithm; controlling a plurality of blast blowers according to the aerobic tank aeration quantity value and the blower performance curve. The control method provided by the embodiment of the invention has the advantages that the biochemical action of the membrane tank is further considered; the control precision is improved; the automatic control on the MBR biochemical treatment aeration process is better realized; the water outlet water quality is stabilized; the sewage treatment energy consumption is reduced; simplicity is realized; the realization is easy.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an aeration control method and control system for an MBR aerobic tank. Background technique [0002] The current MBR (Membrane Bioreactor, membrane bioreactor) engineering operation still has some shortcomings such as high energy consumption, and the high energy consumption of MBR is mainly due to the aeration in the membrane pool and the aerobic pool. During the operation of the existing MBR project, the aeration volume of the aerobic tank is mainly set to a constant value based on the experience of the operator, and it is manually adjusted under necessary conditions, so there may be aeration when the influent load is too low The problem of excess flow or insufficient aeration when the influent load is high. Therefore, realizing automatic control of the aeration process of MBR biochemical treatment is of great significance for stabilizing effluent water quality and red...

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Problems solved by technology

[0005] (1) The development of related technologies is based on the sewage treatment process using the traditional activated sludge process. Compared with the traditional activated sludge process, MBR has increased the membrane tank with a high concentration of dissolved oxygen, and there are still obvious The aerobic degradation process of pollutants, and the sludge backflow will also affect the operation status of the front-end aerobic tank, so the control of the aeration rate of the aerobic tank cannot ignore the biochemical reaction of the membrane tank

[0006] (2) When using single-stage feedback control, the control point of dissolved oxygen is generally set by manual experience, which is prone to errors

In the control system with feed-forward compensation, due to the harsh working environment of the online instrument at the water inlet, inaccurate monitoring data, and model errors, the output dissolved oxygen control point has errors or oscillations, thus affecting the aeration rate of the aerobic tank. poor control

[0007] (3) When the expert system or internal model control strategy is adopted, the control effect is greatly affected by the accuracy of the model and parameter calibration, and it is difficult to apply it in large-scale practical projects

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