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A two-class population balance equation yielding bimodal flocculation of marine or estuarine sediments
Lee, B.J.; Toorman, E.; Molz, F.J.; Wang, J. (2011). A two-class population balance equation yielding bimodal flocculation of marine or estuarine sediments. Wat. Res. 45(5): 2131-2145.
In: Water Research. Elsevier: Oxford; New York. ISSN 0043-1354, more
Peer reviewed article  

Available in  Authors 

    Flocculation; Sediments; Marine; Brackish water
Author keywords
    Sediment; Flocculation; Population balance equation; Bimodal; Microfloc; Macrofloc

Authors  Top 
  • Lee, B.J., more
  • Toorman, E., more
  • Molz, F.J.
  • Wang, J., more

    Bimodal flocculation of marine and estuarine sediments describes the aggregation and breakage process in which dense microflocs and floppy macroflocs change their relative mass fraction and develop a bimodal floc size distribution. To simulate bimodal flocculation of such sediments, a Two Class Population Balance Equation (TCPBE), which includes both size-fixed microflocs and size varying macroflocs, was developed. The new TCPBE was tested by a model-data fitting analysis with experimental data from 1-D column tests, in comparison with the simple Single-Class PBE (SCPBE) and the elaborate Multi-Class PBE (MCPBE). Results showed that the TCPBE was the simplest model that is capable of simulating the major aspects of the bimodal flocculation of marine and estuarine sediments. Therefore, the TCPBE can be implemented in a large-scale multi-dimensional flocculation model with least computational cost and used as a prototypic model for researchers to investigate complicated cohesive sediment transport in marine and estuarine environments. Incorporating additional biological and physicochemical aspects into the TCPBE flocculation process is straight forward also.

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