基于PLC的污水处理系统毕业论文新.doc

目录 第一章 绪论 1 1.1国内污水处理行业的发展 1 1.2 生活污水的处理工艺 2 1.3 SBR污水处理工艺 3 1.4 本课题研究的主要内容 4 第二章 控制方案 6 2.1 系统的总体设计 6 2.2 工艺及控制要求分析 8 2.2.1 格栅池 8 2.2.2 调节池 9 2.2.3 SBR反应池池 9 2.2.4 除盐池 9 2.3 PLC的I/O分配 10 2.4 I/O设备确定及PLC的选型 11 2.4.1 I/O设备确定 11 2.4.2 PLC的选型 11 2.5软件的介绍 12 第三章 PLC程序设计 14 3.1系统外部接线图如图3.1所示 14 3.2程序流程图如图3.2所示 15 3.3梯形图如图3.3所示 16 3.4程序仿真图及系统说明 19 结束语 24 致谢 25 参考文献 26 摘要 随着我国国城市化进程的推动，中小城市(镇)数量的不断增多，由其带来的水污染问题日趋严重。序批式活性污泥法(简称SBR)符合中小城镇污水处理的基本要求，但必须实现自动控制，才能发挥其优势，使其具有更加广阔的应用前景PLC 污水处理 SBR工艺  The Sewage Treatment System Based on PLC Abstract Along with our countrys urbanization drive, small and medium-sized cities (town), the increasing number of water pollution problems brought by the increasingly serious. Sequencing batch type activated sludge (hereinafter referred to as the SBR) comply with small towns is the basic requirement of sewage disposal, but must achieve automatic control, to exert its advantages, make its have more broad application prospects. As automation technology, computer technology unceasing development, improve the level of automation, sewage treatment plants also increase. And with its mature technology of PLC controller, versatility, high reliability, good flexibility, expand convenient installation and performance to price higher series of advantages, in industrial control are getting more and more widely. This article mainly introduced the sewage treatment plant in automatic control system composition, function and how to make use of PLC automatic control, and introduces the system implementation problems encountered and their solutions. In sewage treatment using PLC control system after the transformation, improve the reliability of the automatic control, not only reduce the labor intensity of the workers, but also improve the operation efficiency of wastewater treatment plant with operation efficiency, realized the scientific production management of the wastewater treatment plant. Key words Sewage treatment PLC SBR process 第一章 绪论 1.1国内污水