Experiences on Instrumentation and Control of Activated Sludge Plants—A Microprocessor Application

Abstract The paper presents experiences and results from a research and development project, where feasibility and advantages of instrumentation and automatic control of activated sludge wastewater treatment processes were investigated. Specifically, process analysis and control methods, experiences on measurement techniques and instrumentation and the developed digital, microprocessor based monitoring and control system are discussed. Results pertaining especially to dissolved oxygen control are given.