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Chlorine is often added to activated sludge to cure filamentous activated sludge bulking. Filamentous bacteria must be killed while flocforming bacteria survive during chlorination of activated sludge to cure bulking. The hypothesis that the flocforming bacteria are shielded from the chlorine by their protected position inside the activated sludge floc is tested. The rapid reaction of free chlorine and activated sludge floe material can limit the penetration of free chlorine to the surface of the activated sludge floc, thus providing some protection for the bacteria inside the floc. Monochloramine reacts slowly and will penetrate the activated sludge floc completely.
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Neethling et al. (1987) studied this question.
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