Systematic Design Face To PH Value Of Centralized Wastewater Treatment On The Fuzzy Adaptive PID Control For Variable-Frequency Drive

With the development of industry and the increasing of urban population,the wastewater treatment is being given more and more attention.It's very important to control the pH value,in order to reach to the requirement for wastewater disposal according to the State Environmental Protection Adminstration.The level of automation of automation of the pH value control system in China relatively falls behind,research and development of automatic system with good control effects and easy realization has much practical meaning.Because of the characteristics of the acid-base neutralization process in wastewater treatment,such as the inherent strong nonlinearity,delay and uncertainty,pH value is considered as one of the most difficult controlled objects.Conbined the intelligence of fuzzy control with the reliability of PID control,the design introduces a fuzzy adaptive PID controller based on the analysis of Ph control theory.Simulation results show that the fuzzy adaptive PID control system for pH value in wastewater treatment has good control effects.which is an ideal intelligent control method.In this thesis,basing on the requests of the control system for pH value is designed,in which the PLC as its key part of processor is used.It accomplishes dats acquisition of pH value,the fuzzy adaptive PID control algorithm,on-line control and serial communication with the monitor computer.At the same time,the monitor computer can display the field data and manage the storage of historical records and the monitor of the whole system.