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Related Experiment Videos

Removal of algae using froth flotation.

W Phoochinda1, D A White

  • 1Department of Chemical Engineering, Faculty of Engineering, Imperial College of Science, Technology and Medicine, London SW7 2BY, United Kingdom.

Environmental Technology
|March 19, 2003
PubMed
Summary
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Froth flotation effectively removes algae using specific surfactants like cetyltrimethylammonium bromide. Optimizing pH and temperature enhances algal removal efficiency, while a two-stage process minimizes water content.

Area of Science:

  • Environmental Science
  • Chemical Engineering
  • Biotechnology

Background:

  • Algal blooms pose environmental challenges, necessitating efficient removal methods.
  • Froth flotation is a promising technique for separating algae from water bodies.

Purpose of the Study:

  • To investigate the efficacy of froth flotation for removing Scenedesmus quadricaudo.
  • To determine the impact of collector type, aeration, pH, and temperature on algal removal efficiency.

Main Methods:

  • Dispersed air flotation was employed to remove Scenedesmus quadricaudo.
  • The study varied collector types (surfactants), aeration rates, pH, and temperature.
  • A two-stage flotation process was evaluated for water removal.

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Main Results:

  • Cetyltrimethylammonium bromide achieved 90% algal removal, while sodium dodecylsulfate yielded only 16%.
  • Decreasing pH increased removal efficiency to 80%.
  • Optimal algal removal occurred at temperatures of 20°C and above; low temperatures reduced efficiency.

Conclusions:

  • Froth flotation, particularly with cetyltrimethylammonium bromide, is effective for algal removal.
  • pH and temperature are critical parameters influencing flotation efficiency.
  • A two-stage process can reduce the amount of water removed with the algae.