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Flotation techniques for oily water treatment.

M V Melo1, G L Sant'anna, G Massarani

  • 1Program de Engenharia Química/COPPE/UFRJ--Universidade Federal do Rio de Janeiro C.P. 68502, 21945-970, Rio de Janeiro--RJ, Brazil.

Environmental Technology
|August 15, 2003
PubMed
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This study introduces advanced flotation and centrifugal separation techniques for treating oil-contaminated water. Both methods effectively removed over 85% of chemical oxygen demand and oil, even with dispersed oil droplets.

Area of Science:

  • Environmental Engineering
  • Chemical Engineering

Background:

  • Industrial wastewater often contains dispersed oil, posing environmental challenges.
  • Effective oil-water separation is crucial for regulatory compliance and water reuse.

Purpose of the Study:

  • To develop and evaluate novel techniques for treating oil-contaminated water.
  • To achieve high oil removal efficiencies, particularly for finely dispersed oil droplets.

Main Methods:

  • Investigated induced air flotation systems (batch and continuous).
  • Developed a compact centrifugal flotation system combining hydrocyclone separation and flotation.
  • Utilized a gas-liquid ejector for bubble generation and a hydrocyclone for froth separation.

Main Results:

Related Experiment Videos

  • Both systems reduced chemical oxygen demand by over 85%.
  • Achieved significant oil concentration reduction in emulsions with 10-20 mm droplets.
  • Polyacrylamide was effective as a destabilizing agent.

Conclusions:

  • Induced air flotation and centrifugal flotation are effective for treating oil-contaminated water.
  • The centrifugal flotation system offers a compact and efficient solution.
  • These methods show promise for managing challenging oil-in-water emulsions.