Unsteady-state sectional influent water depth nitrogen and phosphorus removal process control system and control method

Abstract

The invention relates to an unsteady-state sectional influent water depth nitrogen and phosphorus removal process control system and a control method. An upper PC (Personnel computer) is connected with a PLC (programmable logic controller) through the Ethernet; the PLC is connected with a motor / variable-frequency control cabinet for controlling influent water load dynamic change and constant dissolved oxygen; the control cabinet is connected with an actuating mechanism and a monitoring device; an influent water phase angle change process, a periodic change process and a sine curve wave crest and wave trough change process are contained in the influent water load dynamic change; a dissolved oxygen determinator, a dissolved oxygen sensor, a gas flow meter and an electric valve are contained in the constant dissolved oxygen control; and a monitoring control system comprises a site instrument, a water inflow adjusting pump, an anaerobic / anoxic reactor and a blower. The motor / the variable-frequency control cabinet is connected with a detection device and a power device by a control bus through the PLC controller and the computer; and the improvement of sectional influent water process performance is realized through controlling the influent water load dynamic change and the constant dissolved oxygen under the unsteady-state influent water conditions.

Description

technical field [0001] The invention belongs to the technical field of biochemical sewage biological treatment, and relates to a process control system and control method for deep denitrification and dephosphorization of unsteady staged water inflow, especially to optimize and improve the process design and operation control strategy of staged water inflow, so as to improve the treatment effect and stability of the process , improve the control performance of the device, and at the same time realize the energy-saving and consumption-reducing method of adjusting the operating parameters in real time according to the change of influent water, which is suitable for the upgrading and transformation of the established sub-influential process or the new process. Background technique [0002] With the attention of the government's environmental protection department, although the domestic sewage treatment rate continues to increase, the eutrophication problem caused by nitrogen and ...

AI Technical Summary

Problems solved by technology

First of all, the valves of existing sewage treatment plants are generally non-linear, and the simple PID control cannot strictly achieve the expected dissolved oxygen control range, and the serious time delay problem leads to a huge disturbance of the dissolved oxygen concentration in the aeration tank

In addition, manual on-site control requires operating personnel to have long-term on-site commissioning experience. Human factors are too large, and a large degree of redundancy is generally adopted to ensure the dissolved oxygen value required to control the normal growth and reproduction of microorganisms, resulting in aeration. waste of consumption

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