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http://dx.doi.org/10.3741/JKWRA.2015.48.3.233

Evaluation of the Two Class Population Balance Equation for Predicting the Bimodal Flocculation of Cohesive Sediments in Turbulent Flow  

Lee, Byung Joon (School of Construction and Environmental Engineering, Kyungpook National University)
Toorman, E.A. (Hydraulics Lab.)
Publication Information
Journal of Korea Water Resources Association / v.48, no.3, 2015 , pp. 233-243 More about this Journal
Abstract
The bimodal flocculation of cohesive sediments in water environments describes the aggregation and breakage process developing a bimodal floc size distribution with dense flocculi and floppy flocs. A two class population balance equation (TCPBE) was tested for simulating the bimodal flocculation by a model-data fitting analysis with two sets of experimental data (low and high turbulent flows) from 1-D flocculation-settling column tests. In contrast to the Single-Class PBE (SCPBE), the TCPBE could simulate interactions between flocculi and flocs and the flocculation mechanism by differential settling in a low turbulent flow. Also, the TCPBE could perform the same quality of simulation as the elaborate Multi-Class PBE (MCPBE), with a small number of floc size classes and differential equations. Thus, the TCPBE was proven to be the simplest model that is capable of simulating the bimodal flocculation of cohesive sediments in water environments and water, wastewater treatment systems.
Keywords
cohesive sediment; flocculi; floc; bimodal; population balance equation;
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