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The design of oxidation ditch control system based on PLC and KingVIEW

With the exhaustion of water resources, the urban sewage circulation processing has become an indispensable way for the construction of an environmental-friendly, energy-saving and sustainable society. The key is directly determined by the superiority of treatment process and automatic level of control system. For instance, there is a sewage treatment plant in Yinchuan city, which has the sewage treatment capacity of 50, 000 t/d and uses the oxidation ditch process. In this paper, we design an automatic control and monitoring system for the sewage treatment plant. In the system, Siemens S7–300 PLC is a slave station. It can be used to control field devices and collect variable data from sensors, including DO, PH, liquid level, flow, and MLSS, etc. The upper computer uses KingVIEW software to exchange data with slave station, thereby realizing the centralized management.