本文讨论了田纳西州纳什维尔哈灵顿水处理厂扩建工程中新的分布式计算机控制系统组件。在描述了处理机组和现有控制系统后，作者讨论了如何分阶段完成新自动化系统的建设和安装，以使工厂能够不间断地运行。新的分布式控制系统通过计算机辅助操作确保了处理厂的可靠运行和出水质量。所涵盖的其他主题包括将过程控制数据用于化学品使用趋势、实验室数据的输入、为运行报告收集过程控制数据，以及汇编过程控制数据以用于未来的运行/处理趋势。 表格描述了软件特性、各种问题的报警显示、图形显示屏以及软件生成的报告。

This paper discusses the new distributed computer control system component of the Harrington Water Treatment Facility in Nashville, Tennessee facility expansion. After describing the treatment train and the existing control system, the authors discuss how construction and installation of the new automation system was completed in phases to allow the plant to operate without interruption. The new distributed control system ensures reliable treatment plant operation and effluent quality through computer-aided operation. Other topics covered include the use of process control data for chemical usage trends, the input of laboratory data and the gathering of process control data for operational reports, and the compilation of process control data for use in future operation/treatment trends. Tables describe software characteristics, the alarm display for various problems, graphic display screens, and reports that are generated by the software.