Knowledge representation in an activated sludge plant diagnosis system

This paper focuses on the knowledge representation framework utilized by an integrated wastewater treatment expert system for diagnosing operational p roblems of an activated sludge plant. The system deals with events that may occur in all the units of an activated sludge plant and exploits oil-line measurements, observations formed from data provided by laboratory analyses and empirical observations in an integrated manner. The system provides as sistance to human experts ro control the activated sludge process. It has b een tested and evaluated in the pilot activated sludge plant of the Water a nd Air Quality Laboratory in the University of the Aegean.