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Fundamentals of Particle Flocculation and Removal From Water

Published online by Cambridge University Press:  15 February 2011

Patrick T. Spicer  and
Sotiris E. Pratsinis
Patrick T. Spicer
Affiliation:
Department of Chemical Engineering, University of Cincinnati, Cincinnati, OH 45221-0171
Sotiris E. Pratsinis
Affiliation:
Department of Chemical Engineering, University of Cincinnati, Cincinnati, OH 45221-0171
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Abstract

The flocculation of polystyrene particles with aluminum sulfate or alum (Al2 (SO4)3) by turbulent shear was studied as a function of the applied shear rates (63–129 s−1) and flocculant concentrations (11 and 32 mg/L) in a stirred tank. Increasing the shear rate increased the floc growth rate but decreased the maximum attainable floc size. Increasing the concentration of alum increased the floc growth rate and the maximum floc size. A steady state between floc growth and breakage was attained after which the floc size distribution no longer changed. The normalized steady state size distributions allowed evaluation of the relative contributions of shear rate and flocculant concentration to the performance of the process.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 344: Symposium I – Materials and Processes for Environmental Protection , 1994 , 217
Copyright
Copyright © Materials Research Society 1994

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