Nitrification Kinetics and Its RBC Application

by Ching-San Huang, Environmental Engr., Air Force Regional Civ. Engr.; M-X, Norton Air Force Base, Calif.,

Serial Information: Journal of the Environmental Engineering Division, 1982, Vol. 108, Issue 3, Pg. 473-487

Document Type: Journal Paper


The surface reaction model for the mechanism of mass transfer-metabolism in the fixed-film nitrification process is investigated and discussed for the design of trickling filter systems and rotating biological contactor (RBC) systems. Two experimental studies are performed. The first study, using a stationary fixed-film reactor to simulate the trickling filter process, reveals that the surface reaction kinetics follow a pseudo-homogeneous model. The second study, using a bench-scale RBC unit, indicates that the pseudo-homogeneous model is also applicable to the rotating fixed-film process. The effective slime thickness of an RBC system can be estimated from this model by locating the optimum NH3-N removal rotating speed and finding the corresponding liquid film thickness at that rotating speed.

Subject Headings: Rotation | Kinetics | Biological processes | Filters | Stationary processes | Thickness | Mass transfer | Simulation models

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