The Hydrodynamic Evaluation of a Fixed Media Biological Process,
KANSAS UNIV LAWRENCE DEPT OF CIVIL ENGINEERING
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TWo basic classifications of flow models for biological processes are presently accepted, plug or piston flow and complete mixing. The trickling filter can be modelled as a plug flow system and the activated sludge process can be designed as a complete mixed system. If a trickling filter and a complete mixed activated sludge system are combined together in a tank, then an interesting question arises on how the mixing characteristics will be changed. A hydrodynamic evaluation was made to characterize the flow patterns and the mean detention time changes inherent to such a system. Tracer analyses were used during the course of the development of a fixed media process which utilized plastic tower packing, but unlike a trickling filter system, the packing was completely submerged. A surface aerator supplied oxygen to the system and provided mixing in the system by pumping action through a draft tube.