Design Criteria for Aerobic Aerated Lagoons

by Dhandapani Thirumurthi, Assoc. Prof. of Civ. Engrg.; Nova Scotia Technical Coll., Halifax, Nova Scotia, Canada,

Serial Information: Journal of the Environmental Engineering Division, 1979, Vol. 105, Issue 1, Pg. 135-148

Document Type: Journal Paper


Laboratory-model studies of nine completely mixed (aerobic) aerated lagoons handling domestic wastewater indicate that the traditionally accepted (linear) first-order BOD removal concept is applicable, provided that the following modification is introduced. The first-order BOD removal coefficient, K, should be corrected to take into account the fact that as detention time increases (or organic load decreases), the value of K decreases, exhibiting a retardant effect. However, there is an alternative design approach characterized by nth order (nonlinear) BOD removal kinetics, where n=1.1. The nonlinear BOD removal coefficient does not display the retardant effect. Engineers may employ any one of the two design methods and, thereby, rationally design completely mixed (aerobic) aerated lagoons.

Subject Headings: Aeration | Lagoons | Laboratory tests | Municipal wastewater | Linear functions | Organic loads | Load factors | Kinetics

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