Design And Improvement For Upgrade Of Sewage Treatment Control System

In order to adapt to the development of the future direction of the country as well as policy and regulatory requirements,the sewage treatment plant in Erlianhaote,Inner Mongolia as a data source and place of implementation In this paper,upgrading its design work has been the construction of sewage treatment pond automatic control system,so that the water quality monitoring data satisfies a criterion B upgraded to a standard A.According to the project requirements,using the "two-stage biological aerated filter-coagulation-precipitation-filtration-disinfection" process,as well as different pools of the process of upgrading the node to complete the control system design.In order to achieve a relatively constant level of liquid,the liquid level control with PID algorithm to complete.Design of dissolved oxygen cascade PID algorithm implemented by adjusting the frequency converter output controlling the amount of air blower to achieve.For dosage control algorithm with integral separation PID.By controlling the liquid level,the amount of dissolved oxygen,the dosage,improve the processing performance of the system,and the prediction results of wastewater treatment according to the design objectives.The paper chooses PLC as the main control system,and consists of a PLC master station and four PLC sub-stations.While complete control and monitoring of the water quality out of BOD,COD,SS,total phosphorus,ammonia and other relevant parameters.Siemens S7-300PLC system control algorithms programming,monitoring the completion of the process,such as level field data,flow control,acquisition,control logic execution section is completed.Designed to use touch screen input data,combined with Wonderware’s InTouch configuration software to monitor the operation of the scene in real time.This design is completed by the actual operation of the system,it proves the system is working properly,is expected to complete the transformation goals,while providing a reference standard of the same type of small and medium sized sewage treatment plant renovation project have mentioned standard.