Abstract
A complete population balance equation governing the floc size distribution interpreting both breakage and aggregation mechanisms was obtained in this work. The present work deals with floc formation and breakage in the presence of polymer coagulants. In order to obtain all the parameters involved in the proposed governing equation, a nonlinear least-squares curve fitting procedure was applied. The aggregation collision efficiency was found to be 0.33 for our clay-polymer flocculation system under optimum dosage. The floc splitting frequency was found to be proportional to the product of turbulent shear rate and parent floc volume. The rate of decrease of parent floc volume due to erosion was verified to be proportional to the product of turbulent shear rate and the mean particle volume of erosion fines. The “maximum stable floc size” in a given turbulence field was found to exist in our system.
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