Abstract
A dynamic control model of a two-stage biological wastewater treatment reactor is developed. The sludge recycle rate is manipulated according to deviations in the exit substrate concentration (feedback control) or to changes in the entering substrate concentration and flow rate (feedforward control). Four kinetic organism growth models are investigated for their influence on the process control: a linear model and a Monod model, both with and without time delay functions. Computer simulations of the system response to sine variations in inlet flow and concentration for various control modes indicate that feedback on-off control is satisfactory for the linear growth model, whereas feedforward control is more effective for the non-linear Monod kinetics.
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