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Updated: Jun 11, 2026

Procedure to Evaluate the Efficiency of Flocculants for the Removal of Dispersed Particles from Plant Extracts

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Published on: April 9, 2016

Flocculation model and collision potential for reactors with flows characterized by high Peclet numbers.

Monroe L Weber-Shirk¹, Leonard W Lion

¹Cornell University, School of Civil and Environmental Engineering, Ithaca, NY 14853-3501, USA. mw24@cornell.edu

|July 8, 2010

Summary

A new model predicts flocculation time in sustainable water treatment, using energy dissipation rate and hydraulic residence time for better performance prediction than traditional methods.

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Area of Science:

Environmental Engineering
Water Treatment Technologies
Fluid Dynamics

Background:

Sustainable water treatment emphasizes energy efficiency and cost-effectiveness.
Gravity-driven hydraulic flocculators without mechanical agitation are crucial for these systems.
Understanding flocculation dynamics under high Peclet number flow regimes is essential.

Purpose of the Study:

To develop a mechanistically-based model for flocculation characterization.
To predict the required reaction time for forming settleable flocs.
To evaluate flocculator performance using novel parameters.

Main Methods:

Incorporated fractal floc description and floc separation distance estimations.
Modeled relative velocities of floc particles based on flow regimes.
Utilized influent turbidity, alum dose, and energy dissipation rate as inputs.

Main Results:

Viscosity is significant in early flocculation stages; turbulent eddies are significant in final stages.
A novel 'collision potential' (ɛ(1/3)θ) better predicts flocculator performance.
This parameter surpasses the conventional velocity gradient (Gθ) predictor.

Conclusions:

The developed model accurately characterizes flocculation in high Peclet number flows.
The collision potential offers a superior metric for flocculator performance assessment.
This approach enhances the design and efficiency of sustainable water treatment systems.