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Related Experiment Videos

Modelling the activated sludge flocculation process combining laser light diffraction particle sizing and population

I Nopens1, C A Biggs, B De Clercq

  • 1Biomath, Ghent University, Belgium.

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|May 7, 2002
PubMed
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Laser light diffraction successfully measured floc size distributions. A population balance model described floc dynamics, but showed limitations in accurately predicting floc size distribution over time.

Area of Science:

  • Water treatment
  • Colloid and surface chemistry
  • Chemical engineering

Background:

  • Flocculation is crucial in water treatment for particle aggregation.
  • Understanding floc size distribution (FSD) dynamics is essential for process optimization.
  • Laser light diffraction offers a method for real-time FSD data collection.

Purpose of the Study:

  • To investigate the impact of shear rate and calcium concentration on FSD.
  • To apply and evaluate a discretized population balance model (PBM) for flocculation dynamics.
  • To assess the PBM's ability to describe experimental FSD data.

Main Methods:

  • On-line experimental data collection using laser light diffraction.
  • Varying shear rates (G) and calcium additions during experiments.

Related Experiment Videos

  • Application of a discretized population balance model (PBM) incorporating aggregation and breakage terms.

    • Main Results:

    • Steady-state mass mean diameter decreased with increasing shear rate (G).
    • Mass mean diameter increased with calcium additions above 8 mg/l.
    • The PBM required estimation of only two parameters: aggregation and breakage rates.

    Conclusions:

    • Laser light diffraction is effective for on-line FSD monitoring.
    • The discretized PBM provides a framework but lacks flexibility and temporal accuracy.
    • Further model refinement is needed for precise FSD prediction in dynamic systems.