Aletai First Sewage Automation Project in Xinjiang
System Overview
Sewage treatment In order to make the discharged sewage reach a certain water body or reuse water quality requirements. It is generally divided into domestic sewage treatment and production sewage treatment.
The automatic control system of Aletai No. 1 Wastewater Treatment Plant in Xinjiang is based on the advanced ideas of modern intelligent factories and adopts a control method of decentralized control and centralized monitoring and management. Tianyou Hengda industrial automation control system applied to sewage treatment plants, can fully meet the requirements of the sewage treatment process, providing a highly reliable, low-cost, more optimized control program.
The automation system consists of a central 1 central control room and 4 on-site PLC control stations. The on-site PLC control station consists of a programmable logic controller (PLC) system and instrumentation. It controls each process of the wastewater treatment plant in a decentralized manner. The central control room (CCR) then implements centralized management of the entire plant. The data communication between the central control room and the PLC control station uses high-speed, real-time industrial Ethernet. The network structure is ring-shaped, the communication speed is 100Mbps, and the transmission medium is optical fiber. The central control station is located in the central control room of the comprehensive building; there are 4 on-site control stations, which are respectively located in the inflow pump room (1#PLC control station), transformer substation (2#PLC control station), blower room (3# PLC control station ), sludge thickening dehydration room (4 # PLC control station).
Case presentation
With the rapid development of China's economy, environmental protection has become a prominent issue. Sewage treatment is an important part of environmental protection. At the same time, with the rapid development of computer technology and China's sewage treatment project, the use of advanced control system sewage treatment project for centralized monitoring has become a trend. The system design is generally composed of a host computer+PLC+remote I/O substation, which solves the problems of low automation, low reliability, and large time lag in the previous wastewater treatment systems. It is a set of advanced, reliable, Simple control system.
Sewage treatment is generally divided into production sewage treatment and domestic sewage treatment. Sewage treatment process includes physical treatment, biochemical treatment, sludge treatment and other sections. At present, common wastewater treatment processes include oxidation ditch, SBR, CASS biological aerated filter (BAF), biofilm, A2/ O method, CAST method, AB method, biological contact oxidation method (BOC), etc.
Electrical control systems often use distributed control systems based on PLCs and computers. Mainly consists of a central control center, multiple PLC workstations, on-site smart meters, sensors, and communications networks.
The central control center consists of computers, monitoring software, printers, and network equipment. It is responsible for setting the entire wastewater treatment process parameters, data reports, trend charts, alarm displays, report printing, and remote operations.
The PLC workstation is responsible for the direct control of various devices according to the specified procedures and data acquisition, and sends the underlying data to the central computer for disposal through the network. At the same time, it receives control commands from the central computer and adjusts the working status of the equipment to meet the requirements of the sewage production process.
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