Intelligent Reform Of Activated Sludge Sewage Treatment Control System

With the national policy to revitalize the old northeast industrial, the economy ofShenyang will achieve the rapid development again, the city continues to expand the scale,population increasing, city sewage increasing. Put forward higher requirement for thecapacity of sewage treatment and effluent quality, compared with the rapid development ofwastewater treatment technology, the existing sewage treatment plant intelligent level isrelatively backward, so that we have to transform the existing sewage treatmenttechnology.According to Shenyang sewage treatment plant control system for intelligenttransformation, the sewage treatment plant uses activated sludge treatment process, thewater mainly come from the city sewage, it is so importance for people in this city. Theidea of intelligent transformation use PLC as the control center, the collected signaltransfer to the PLC, then according to the specific design requirements, to control therelated equipment, to save human resources, to meet the requirements of water quality.The intelligent transformation implementation plan of this system bases on theexisting sewage treatment plant activated sludge process, to select measuring instrumentand sensor for the three different stages of sewage treatment, and the control systemhardware selection and configuration of the determination of each subsystem and workmode; To use S7—200 series PLC of SIEMENS company as the main controller to processautomatic control, and use of the STEP—7 Micro/Win32 program software to programme;The development of simulation software for plant sewage treatment of industrialcontrolling computer using Lab VIEW graphical programming software, to develop thesimulation diagram of the general layout of the sewage treatment plant and each subsystem,to achieve the parameters of the acquisition and display; the controlled device connect toPLC interface through RS485 via, realize the communication with PLC through the USSconverter communication protocol, to realize the communication between PLC softwarethrough OPC, to achieve real-time monitoring of the physical parameters through the IPC.In this paper, the transformation of the content of sewage treatment plant inintelligence, security and economy to meet the high requirements for sewage treatment,reducing the tedious daily operation management, improving the degree of automation ofthe sewage treatment plant, it can meet the requirements of the level A emission standard,bring good economic and social benefits, and develop a set of sewage treatment plant todevelop software for the staff, this system has definite application value.