This work is focused on controlling the Dissolved Oxygen in a SBR pilot plant fed with real wastewater. Two different implementations of Dissolved Oxygen control are presented. On the one hand, an ON/OFF control produces oscillations around the set point, this cycling behavior affects other process variables and makes the supervisory tasks more difficult. On the other hand fuzzy control allows a better Dissolved Oxygen behavior, which means a global process behavior. The results of using both methods are shown and compared.
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