Abstract
Earlier computational studies of optimal periodic operation of wastewater treatment plants are extended to include comparisons with classical control performance and to consider a structured sludge kinetics model. For two quite different examples, periodic control reduces effluent BOD and/or its variability relative to conventional control. Furthermore, the optimal periodic control for structured sludge kinetics can be substantially different from the Monod/decay sludge kinetics result, illustrating the importance of accurate identification of sludge kinetics for optimizing activated sludge process performance.
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