Sonication for the study of floc strength and reflocculation of activated sludge

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Abstract
Sonication produces very high levels of activated sludge floc breakdown, resulting in correspondingly large increases in CST. It is proposed that sonication and CST be used to study floc strength in activated sludges. Using such a method very significant differences in floc strength have been demonstrated, which were not as apparent when floc breakage was achieved by shear‐stirring. The high levels of floc breakage which occur during sonication produce long periods of reflocculation measured in terms of CST reduction. It is therefore possible to use sonication and CST to study reflocculation of activated sludge.

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