Abstract
Abstract A computerized algorithm is developed for design and analysis of the steady-state step-feed activated sludge system with secondary sedimentation. It takes into account both the biodegradation occurring in the aeration tank and the solids-liquid separation process. The biodegradation model considers an aeration tank with any number (n) of stages. The algorithm also deals with the effluent clarification and sludge thickening processes that may occur in the sedimentation tank, and accounts for the interactions occurring between the aeration tank and the final settling tank. The resulting system of nonlinear equations is solved by an iterative procedure. A computer program (STEPF) is used to obtain design results, and general conclusions are drawn.
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