Abstract
Abstract An activated sludge plant has been investigated which has two aeration basins in series, and where both influent and recycle stream can be distributed arbitrarily between the two basins. A 7th order dynamic model of the plant was developed, calibrated, and validated. The optimal control was calculated by means of an iterative technique, which is based on the assumption that the input is periodic with a period of one day. Computational results obtained so far indicate that a substantial improvement of the performance can be obtained by appropriately controlling the total recycle flow rate and the distribution of the influent and recycle flow.
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