A simple model to study the flocculation of suspensions over time

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Abstract

The model based on logistic growth theory, that was introduced in Chassagne, Claire, and Zeinab Safar. “Modelling flocculation: Towards an integration in large-scale sediment transport models.” Marine Geology 430 (2020): 106361, can be used to model the time evolution of either the particle (floc) size or the concentration of particles of a given size. In the present article, we show how this model can easily be linked to the many studies performed over the years about the flocculation kinetics at the onset of flocculation experiments. Flocculation experiments done on kaolinite suspensions destabilized by addition of salt are used as examples. Both perikinetic and orthokinetic flocculation are considered. By fitting the experimental data over the whole experiment period, it is shown that the floc size L(t) time evolution follows the relation dL/dt = L/tb − L2/(Leqtb) where tb is a characteristic time and Leq a characteristic size, which are obtained from the fits.

Original languageEnglish
Pages (from-to)302-311
Number of pages10
JournalChemical Engineering Research and Design
Volume172
DOIs
Publication statusPublished - 2021

Keywords

  • Clay
  • Colloid
  • Flocculation
  • Logistic growth
  • Population balance

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