Ref ID : 1153
Colin R. Curds and G.J. Fey; The effect of ciliated protozoa on the fate of Escherichia coli in the activated-sludge process. Water Research 3:853-867, 1969
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The removal of E. coli from sewage in two bench-scale activated-sludge plants was investigated in the absence of protozoa. Ciliated protozoa were then added to one of the plants and the results were compared. With protozoa absent the half-life of E. coli in the plant was 16 hr. This was reduced to 1.8 hr in the presence of protozoa. It is clear that protozoa play the dominant part in the removal of E. coli from sewage. A decrease in the total viable bacteria in the effluent was also observed when protozoa were added to the activated-sludge plant, confirming earlier demonstrations of the importance of protozoa in the clarification of sewage effluent.