Development of Activated Sludge Process Control System By Using Advantages of Mathematical Models

近年来，对活性污泥法的需求包括从废水中脱氮除磷、高性能和紧凑型、节能运行等。这些高度先进的系统需要组织良好的过程控制和监控，这反过来又增加了对活性污泥法的结构化模拟模型的需求。本研究旨在开发一种基于结构化数学模型的活性污泥控制系统。重点研究了过程控制策略，开发了实用的过程模拟程序，开发了连接过程控制硬件和活性污泥法数学模型的人机界面。在此基础上，构建了基于黑板概念的过程控制系统，将在线数据、化学实验室分析结果、Fassy-Expert模型和数学仿真模型集成在一起，对过程进行监控。在高负荷脱氮过程中对该系统的有效性进行了测试。此外，通过引入活性污泥絮凝体结构，开发了一个新的模拟程序。经过改进，硝化-反硝化过程得到了更好的模拟结果。

Recent demands for activated sludge processes inclide introduction of nitrogen and/or phosphorus removal from wastewaters, high performance and compact size, energy saving operation, etc. These highly advanced systems require well organized process control and monitoring, which in turn raise the need for a structured simulation model of activated sludge process. The present study aimed at developing an activated sludge control system based on structured mathematical models. Especially, (1) investigation of process control strategy resulting in development of a practical program for process simulation, and(2) development of man-machine interface which connect process control hardwares and the mathmatical model of activated sludge process, were atempted. As the result, a procerss control system based on the blackboard concept was constructed, in which on-line data, analytical results from chmical laboratory, fassy-expert model and mathematical simulation model are integrated to monitor and control the process. The effectiveness of the system was tested against a high loading nitrogen removal process. In addition, a new simulation program was developed by introducing activated sludge floc structure. By this modification, a better simulation results were obtained for nitrification-denitrification processes.