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Metal biosorption-flotation. Application to cadmium removal

K A Matis1, A I Zouboulis, A A Grigoriadou

  • 1Laboratory of General and Inorganic Chemical Toxicology, Department of Chemistry, Aristotle University, Thessaloniki, Greece.

Applied Microbiology and Biotechnology
|May 1, 1996
PubMed
Summary

This study explores biosorption and flotation to remove toxic metals like cadmium from water. The combined process achieved over 95% metal removal and biomass recovery in continuous-flow tests.

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Area of Science:

  • Environmental Science
  • Chemical Engineering
  • Biotechnology

Background:

  • Toxic metal contamination in aqueous solutions poses significant environmental and health risks.
  • Conventional methods for metal removal can be costly and inefficient for dilute solutions.
  • Biosorption offers a potentially sustainable approach using biological materials.

Purpose of the Study:

  • To investigate a combined biosorption and flotation process for toxic metal removal.
  • To evaluate the efficiency of removing cadmium from dilute aqueous solutions.
  • To assess the reusability of the biosorbent and the impact of filter aids.

Main Methods:

  • Utilized suspended non-living biomass for biosorption of toxic metals.
  • Employed flotation for efficient separation of metal-loaded biomass.

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  • Conducted laboratory-scale batch and continuous-flow experiments.
  • Investigated process parameters including biosorbent re-use and zeta-potential.

    • Main Results:

    • Achieved over 95% removal of toxic metals (cadmium).
    • Demonstrated over 95% recovery of suspended biomass using flotation.
    • Established an effective flotation residence time of 4 minutes.
    • Confirmed that filter aids present in biomass waste did not interfere with the process.

    Conclusions:

    • The combined biosorption-flotation process is highly effective for removing toxic metals from dilute aqueous solutions.
    • The process demonstrates excellent efficiency in both metal removal and biomass recovery.
    • The method shows potential for sustainable and cost-effective wastewater treatment applications.