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Related Experiment Videos

Blanket dynamics in upflow suspended bed.

S T Su1, R M Wu, D J Lee

  • 1Chemical Engineering Department, National Taiwan University, Taipei, 10617, Taiwan.

Water Research
|November 25, 2003
PubMed
Summary
This summary is machine-generated.

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This study models solids fraction dynamics in suspended beds, predicting uniform distributions at varying concentrations. Experiments confirmed these predictions, identifying optimal conditions for low turbidity.

Area of Science:

  • Environmental Engineering
  • Fluid Dynamics
  • Water Treatment

Background:

  • Understanding solids fraction dynamics is crucial for optimizing suspended bed reactors.
  • Hydrodynamic dispersion and convection significantly influence particle distribution.
  • Poly-aluminum chloride (PACl) is a common coagulant in water treatment.

Purpose of the Study:

  • To develop a one-dimensional model for spatio-temporal solids fraction variation.
  • To investigate the impact of hydrodynamic dispersion and convection on solids distribution.
  • To experimentally validate model predictions and identify optimal operating conditions for suspended beds.

Main Methods:

  • Developed a wave equation model incorporating hydrodynamic dispersion and convection.

Related Experiment Videos

  • Conducted lab-scale experiments using synthetic raw water treated with PACl.
  • Constructed solids flux plots for various coagulant doses (underdosed, optimal, overdosed).

    • Main Results:

    • Model predicted shock-wave like solutions for solids fraction evolution.
    • Observed initial uniform distribution followed by compaction to a higher uniform distribution.
    • Experimental results confirmed theoretical predictions regarding solids fraction behavior.
    • Coagulant dose variations affected blanket height, response time, and solids flux curve.

    Conclusions:

    • The developed model accurately predicts solids fraction behavior in suspended beds.
    • Optimal coagulant dosage is critical for achieving low effluent turbidity.
    • The study identified optimal operational conditions for upflow suspended beds.