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详细阐述了城市污水处理工艺过程,同时结合具体工程实践研究设计了一套基于PLC控制的污水处理厂控制系统,提出了控制系统总体方案以及详细的软硬件实现过程.“,”This paper describes the city sewage treatment process, combines with the specific engineering practice, studies and designs a set of control system based on PLC in the sewage treatment plants and puts forward the control plan of the system and the details hardware and software implementation process.