Transactions of the Society of Instrument and Control Engineers
Online ISSN : 1883-8189
Print ISSN : 0453-4654
ISSN-L : 0453-4654
Gain-Maximizing Dissolved Oxygen Control Using Discrete-Time Adaptive Broken Line Fitting in the Activated Sludge Process
Ryohei TANUMAKosei SASAKIIwao MATSUNAGA
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1990 Volume 26 Issue 5 Pages 528-535

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Abstract
This paper describes the study of a dissolved oxygen (DO) concentration control in an activated sludge process. The DO concentration at a specific point is controlled around the time-varying set point, which is so manipulated that the gain of the DO concentration with respect to the aeration air flow rate becomes maximum. A new discrete-time algorithm is developed for this control. This algorithm is based on high-pass filters characterized by the parallel configuration of a time lag and a moving average, a difference-form broken line fitting for the gain maximization, and an adaptive PI control, with which the DO concentration is controlled around the time-varying set point. Experiments in a pilot-scale plant show that this control algorithm performs satisfactorily to be applied in actual plants.
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