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Related Experiment Video

Updated: May 25, 2026

Quantification of Heavy Metals and Other Inorganic Contaminants on the Productivity of Microalgae
10:20

Quantification of Heavy Metals and Other Inorganic Contaminants on the Productivity of Microalgae

Published on: July 10, 2015

Microflotation performance for algal separation.

James Hanotu1, H C Hemaka Bandulasena, William B Zimmerman

  • 1Department of Chemical and Biological Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD, United Kingdom.

Biotechnology and Bioengineering
|February 1, 2012
PubMed
Summary
This summary is machine-generated.

Fluidic oscillation efficiently generates microbubbles for algae separation, achieving 99.2% removal. This microflotation method offers a low-energy alternative to conventional dissolved air flotation (DAF).

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Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Separation Processes

Background:

  • Conventional dissolved air flotation (DAF) faces challenges with high energy consumption and turbulent flow.
  • Efficient microbubble generation is crucial for effective algae separation in water treatment.

Purpose of the Study:

  • To investigate the performance of microflotation using fluidic oscillation for microbubble generation in algae separation.
  • To compare the efficacy of different metallic coagulants and their optimal conditions (concentration, pH) for algae removal.

Main Methods:

  • Utilized a fluidic oscillator to generate microbubbles (average size 86 µm) via oscillatory air flow.
  • Investigated algae separation by varying metallic coagulant types (ferric chloride, ferric sulfate, aluminum sulfate), concentration (up to 150 mg/L), and pH (acidic conditions, pH 5).
  • Characterized bubble sizes generated under both oscillatory and continuous air flow for comparison.

Main Results:

  • Fluidic oscillation produced significantly smaller bubbles (86 µm) compared to continuous air flow (1,059 µm).
  • Optimal algae separation performance (99.2%) was achieved using ferric chloride at 150 mg/L and pH 5.
  • Ferric sulfate (98.1%) and aluminum sulfate (95.2%) also showed high removal efficiencies.
  • Microflotation demonstrated comparable performance to DAF but with laminar flow and significantly lower energy density.

Conclusions:

  • Fluidic oscillation is a highly effective method for generating microbubbles for efficient algae separation.
  • Microflotation using fluidic oscillation offers a promising, low-energy alternative to conventional DAF for water treatment.
  • Ferric chloride is the most effective coagulant among those tested for this microflotation process.