Model prediction control method for enriching low-concentration phosphorus in sewage treatment

Abstract

The invention discloses a model prediction control method for enriching low-concentration phosphorus in sewage treatment in the technical field of water treatment. According to the method, a water inlet unit, a water treatment unit, a water outlet unit, a dosing pump, a mathematical model, a model calibration unit and an MPC controller are included; the model calibration unit comprises a first calibration module and a second calibration module; the water inlet unit is provided with a first sensor, and the first sensor transmits collected data to the MPC controller and the first model calibration module. The water outlet unit is provided with a second sensor, and the second sensor transmits collected data to the second model calibration module; the water treatment unit comprises a biochemical reactor and a secondary sedimentation tank which are communicated with each other, the biochemical reactor is respectively communicated with the water inlet unit and the dosing pump, the secondary sedimentation tank is communicated with the water outlet unit, the dosing pump is electrically connected with the MPC controller, and the MPC controller obtains the dosing amount of a medicament through a mathematical model. The method has the advantage that the enrichment and recovery efficiency of the low-concentration phosphorus in the sewage is improved.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a model predictive control method for enriching low-concentration phosphorus in sewage treatment. Background technique [0002] Sewage treatment reactors cannot choose the nature of their influent water, which determines that the quality and quantity of their influent water have been in a state of random fluctuations. The design of sewage treatment plants generally assumes that the sewage treatment process is in a steady state. However, fluctuations in the quality and quantity of influent water make it almost impossible for the sewage treatment process to be in a stable state. For the traditional removal of organic matter, conservative design is generally used to increase the volume of the sewage plant to keep the effluent below a certain standard. This also results in low efficiency of sewage treatment and waste of energy. [0003] Phosphorus in sewage is a pollutant a...

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Problems solved by technology

In addition, biological phosphorus removal requires a relatively low sludge residence time, while sewage biological denitrification requires a relatively high sludge residence time. Through conventional control methods, it is difficult to achieve both goals at the same time.

[0005] Therefore, the process of sewage biological treatment is a typical multi-input and multi-output problem. The traditional PID control mainly has a good control effect on single input and single output, but it is difficult to achieve a relatively good control effect on complex problems with multiple inputs and multiple outputs. Satisfactory control effect

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