Abstract

Pirt and Bazin1 discussed possible adverse effects of bacterial predation by protozoa on the removal of substrate by activated sludge. Their analysis considered not activated sludge but a single-stage chemostat without recycle as used experimentally by Curds2, and mathematically by Curds3 and Canale4, for the study of predator/prey interactions. Pirt and Bazin1 concluded that efficient waste removal could best be achieved with two chemostats in series, eliminating protozoa from the first stage by operating it at a dilution rate in excess of their maximum specific growth rate.

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