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Related Experiment Videos

Modelling the global efficiency of dissolved air flotation.

D M Leppinen1, S B Dalziel, P F Linden

  • 1Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Silver Street, Cambridge CB3 9EW, UK.

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|June 8, 2001
PubMed
Summary

Larger bubbles and particles improve dissolved air flotation efficiency. Future ultra-high surface loading rates necessitate doubling bubble size for optimal performance in flotation tanks.

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Area of Science:

  • Environmental Engineering
  • Chemical Engineering
  • Water Treatment Technologies

Background:

  • Dissolved air flotation (DAF) is a critical process in water and wastewater treatment.
  • Optimizing DAF efficiency is essential for meeting stringent discharge standards and operational goals.
  • Understanding the interplay between bubble size, particle size, and DAF performance is key to process improvement.

Purpose of the Study:

  • To investigate the impact of bubble and particle size on dissolved air flotation efficiency.
  • To model the rise speed of bubble/particle agglomerates and the bubble attachment process.
  • To provide recommendations for optimizing DAF performance under high surface loading rates.

Main Methods:

  • Modeling the rise speed of bubble/particle agglomerates as a function of bubble and particle size.

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  • Utilizing the population balance approach, as adopted by Matsui, Fukushi, and Tambo, to model bubble attachment kinematics.
  • Analyzing the relationship between bubble size, particle size, and overall flotation efficiency.

    • Main Results:

    • Flotation efficiency is generally enhanced by increasing both particle size and bubble size.
    • A significant finding indicates that larger bubbles are crucial for effective flotation.
    • For future DAF tanks operating at ultra-high surface loading rates (≥25 m/hr), bubble size must be doubled.

    Conclusions:

    • Optimizing bubble and particle size is vital for maximizing dissolved air flotation efficiency.
    • The study provides a quantitative basis for adjusting bubble size to meet future treatment demands.
    • Implementing larger bubbles is a necessary adaptation for achieving high-efficiency DAF at advanced loading rates.