In spite of the widespread availability of step feed configurations in activated sludge systems, little use has been made of their control potential. The main aim of this study is to provide a better understanding of applying step feed control considering the role of biomass activity in the settler. The control strategy was evaluated by simulating the dynamics of an activated sludge system. The model contains both biomass activity in the settler and step feed capabilities. The model and the strategy then have been evaluated against pilot scale and full scale experimental data.

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