Minimization of Multistage RBC Active Disc Area
Publication: Journal of Environmental Engineering
Volume 119, Issue 2
Abstract
An analytical approach to the minimization of total active disc area , required for organic carbon removal [i.e., biochemical oxygen demand (BOD)] by a multistage rotating biological contactor (RBC), is presented. RBC operation is simulated using semiempirical models based on a saturation‐type (Monod) removal rate, and on a first‐order kinetics removal rate. The parameters used in the predictive equations are considered to be different from one RBC stage to the next. The minimizations of , based in turn on each of the two semiempirical models, lead to a relationship between the optimal soluble substrate concentration of any stage and those of the immediately preceding and succeeding stages. When used in design, these relationships allow the minimum , as well as the optimal number of stages required for carbon removal, to be obtained. For the saturation model, two parametric ratios ( and ) are introduced, which define the change in the model parameters with stage. Application of the relationships to the determination of the optimal number of stages and the minimum is included.
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Copyright © 1993 American Society of Civil Engineers.
History
Received: Dec 12, 1991
Published online: Mar 1, 1993
Published in print: Mar 1993
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