The Research Of Aeration Control System In Wastewater Treatment

The economic development of China is faster and faster, leading to more and moreserious environment problem, and the problem of water pollution is getting more and morenational attention. Although wastewater treatment in China after years of development, hashad a very big enhancement, but the wastewater processing load can’t still keep up with theincreasing quantity of wastewater effluent. And compared with the advanced countries, thereis also a big gap in the automation degree. Wastewater treatment belongs to high energyconsumption industry and the cost of wastewater treatment is big. The main energyconsumption of wastewater plant is for aeration system, accounting for about50%~70%ofthe entire plant power consumption. Therefore, as the key to saving energy and reducingconsumption in wastewater, the research of aeration control system has very importantsignificance.According to actual wastewater treatment aeration control problems such as nonlinearity,time lag and uncertainty, this article puts forward a kind of intelligent control strategy ofdissolved oxygen. First of all, according to various water quality parameters andenvironmental factors, this paper constructs a rule-based multilevel fuzzy controller to makeintelligent dynamic setting for the values of dissolved oxygen. Second, the fan controlsystems controlled by fuzzy PID control and conventional PID control make a cascade controlsystem, guarantying the dissolved oxygen value in the setting one. The simulation resultsprove that the fuzzy PID control system response fast, the stable time is short and it shows thegood control performance. The control system can adjust the setting value of dissolvedoxygen and the control parameters of the system automatically according to the variation ofworking conditions and environment, and it has good control performance to differentworking environment. The hardware implementation system of control system takes32-bitmicrocontrollers STM32F107based on ARM Cortex-M3kernel as control core, and thesystem has high level integration, high performance, low power consumption and real-timeapplication at an organic whole, fully meeting the operation requirements of system controlalgorithm. The main research work done in this paper is divided into the following severalaspects: (1) This paper introduced the wastewater treatment research status at home and abroad indetail, and understood the research background and significance of this topic.(2) Through summary analysis, multistage fuzzy control system is established.This paper established a cascade control composed of fussy PID and the conventional PIcontrol, used fussy editor and simulink toolbox of MATLAB to simulate, and the resultsshowed that the fussy PID controller had good control performance.(3) This paper chose32bit micro-controller STM32F107as the control core, and madehardware implementation of the above-mentioned control algorithm.(4) In the Keil MDK environment, this paper used the C language to make modularprogramming design for the system software control.