Abstract
The Witney Sewage Treatment Works of Thames Water has been established as the Evaluation and Demonstration Facility (EDF) for instrumentation, control and automation (ICA) in sewage treatment. The objectives of the process related EDF programme have included demonstration of the viability of computer-based process management systems, the investigation of the interactions of processes and the development of methods for their optimisation. Evaluation of process monitoring instrumentation has demonstrated that whilst severe shortcomings still exist in some areas reliable process automation can be achieved. Successful routine operation of the Witney plant has been maintained by the automatic control system and a detailed assessment of the main control functions has shown benefits which include cost savings, more accurate control and early warning of equipment failure. Progress has also been made in the modelling both of process performance and of operating costs. This work will lead to the development of software tools to aid process management and to enable process optimisation.
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