Research Of Industrial Wastewater Treatment Process Controlling And Modeling

With the high speed development of our country's economy, the environmental protection is already an outstanding problem which needs more attention. Wastewater treatment is the most important link in the environmental protection. In the meantime with the quick development of the computer technique and the wastewater treatment in our Country, the demand upon the automation of wastewater treatment is rising all the while. Making use of the advanced control technique and equipments to supervise and control wastewater treatment is very necessary.In the meantime, because of the strong nonlinear of wastewater treatment, the many varieties of random parameters as input flux and the lack of biologic sensor, there isn't mature and cheap online measurement. The modeling research of wastewater treatment is very important now.This dissertation is about a wastewater treatment factory in Wuxi, designs a set of wastewater treatment control system based on industrial Ethernet and PROFIBUS. The control system has three parts:Electric part: design the electricity control circuit based on the process flow of wastewater treatment, includes on-off control, parameter display,fault handle and signal collection. PLC program: first assure the request of each control sub-system, and programme it, secondly debug the program of the whole system.Develop the Customer software with WinCC: develop the supervision interface of wastewater treatment, establish the database of equipment operation, equipment running state and water quality parameter and display the real-time curve of water quality. The alarm picture of monitor and control accomplished the function of real-time alarm,automatic generation and printing the reports of the whole factory. Every interface has developed designing picture and running picture.Through use the great configuration abilities of WinCC, supervise of wastewater treatment factory conveniently.Lastly, through use the soft sensor technique based on SVM, deal with the difficulty of the test of output water quality parameter. Apply soft sensor model to predict wastewater treatment process, establish the soft sensor model of output water quality parameters which are only tested manually before. This dissertation uses real wastewater treatment process data to simulate with Matlab software .The result shows the availability of this method.