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Characterizing flocculation under heterogeneous turbulence.

D Cory Hopkins1, Joel J Ducoste

  • 1Department of Civil Engineering, North Carolina State University, 208 Mann Hall, Raleigh, NC 27695-7908, USA.

Journal of Colloid and Interface Science
|July 30, 2003
PubMed
Summary
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Turbulent heterogeneity in flocculation reactors impacts particle aggregation. Higher velocity gradients (G) reduce floc size, while increased particle concentration and sweep floc mechanisms enhance floc growth and size.

Area of Science:

  • Environmental Engineering
  • Fluid Dynamics
  • Colloid Science

Background:

  • Particle aggregation and breakup are crucial in water treatment processes.
  • Turbulence characteristics significantly influence flocculation dynamics.
  • Understanding flocculation reactor performance requires analyzing key operational parameters.

Purpose of the Study:

  • To investigate the effects of turbulent heterogeneity on particle aggregation and breakup.
  • To analyze the influence of velocity gradient (G), particle concentration, and coagulation mechanism on floc properties.
  • To examine spatial variations in floc characteristics within a reactor.

Main Methods:

  • Experiments conducted in a bench-scale reactor with an axial-flow impeller.
  • Utilized a photometric dispersion analyzer (PDA) for measurements.

Related Experiment Videos

  • Varied average characteristic velocity gradient (G), particle concentration, and coagulation mechanism (sweep floc vs. charge neutralization).

    • Main Results:

    • Increased G led to enhanced floc growth but decreased mean floc size and variance.
    • Higher primary particle concentration and sweep floc mechanism resulted in increased floc growth, mean size, and variance.
    • Spatial variations observed: larger floc size and growth rate in the bulk region, larger variance in the impeller discharge region at low G.

    Conclusions:

    • Turbulent heterogeneity plays a significant role in flocculation reactor performance.
    • Operational parameters like G, particle concentration, and coagulation mechanism must be optimized for desired floc properties.
    • Reactor design and operating conditions should account for spatial variations in turbulence to manage flocculation effectively.