The Design And The Research Based On The Automatic Control System Of The Chemical Dosing Control System In Sewage Disposal System

This thesis has discussed the craft process and the automatic control system principle of the wastewater treatment, analyzed the control method of dosing, Put forward the thought of the intelligence control and given a design project of controller. This based on the strict request of the accuracy for the acidity in oxidation ditch and combined the development of the dosing and the system principle analysis of domestic and international.This paper has introduced the craft process and the network structure of the wastewater treatment system; introduced the system named the dosing control system; and introduced an improved means of the dosing control system. Concretely as follows: firstly, the transfer function of the acidity in oxidation ditch was acquired by using MATLAB, in which a model can be easily established by experimental data ; secondly, fuzzy controller structure was established, which based on the design of fuzzy controller ; thirdly, the intelligence control was imitated and analyzed with the MATLAB software, more ideal controller parameter was gained, which made the control request of the system and match to the valid control of the chemical dosing for the system;The result expressed, the control strategy brought forward in the text came to the request of the higher craft level, and owned good the orientation characteristic, the anti- interference characteristic and the control accuracy.