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Modelling Cr(VI) removal by a combined carbon-activated sludge system.

A Micaela Ferro Orozco1, Edgardo M Contreras, Noemí E Zaritzky

  • 1Centro de Investigación y Desarrollo en Criotecnología de Alimentos (CIDCA), CONICET, Fac. de Cs. Exactas, UNLP. 47 y 116 (B1900AJJ), La Plata, Argentina.

Journal of Hazardous Materials
|June 5, 2007
PubMed
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Adding powdered-activated carbon to activated sludge enhances hexavalent chromium removal from wastewater. This combined system, utilizing both biomass and powdered-activated carbon, offers a more effective treatment than either component alone.

Area of Science:

  • Environmental Science
  • Biotechnology
  • Chemical Engineering

Background:

  • Wastewater treatment often faces challenges with toxic substances like hexavalent chromium (Cr(VI)).
  • The combined carbon-activated sludge process is a potential solution to protect biomass from such toxins.
  • Limited data exists on powdered-activated carbon (PAC) effectiveness in activated sludge reactors for Cr(VI) removal.

Purpose of the Study:

  • To assess Cr(VI) removal efficiency by activated sludge, PAC, and their combination.
  • To develop mathematical models for predicting Cr(VI) removal kinetics.
  • To evaluate the synergistic effects of PAC and biomass in Cr(VI) remediation.

Main Methods:

  • Experimental testing of three Cr(VI) removal systems: activated sludge (S1), PAC (S2), and combined (S3).

Related Experiment Videos

  • Application of a Monod-based model for S1 kinetics.
  • Development of a first-order kinetic model for S2, considering both Cr(VI) and PAC concentrations.

    • Main Results:

    • The combined carbon-biomass system (S3) demonstrated significantly faster Cr(VI) removal than individual systems.
    • Activated sludge (S1) removal followed Monod kinetics.
    • PAC (S2) removal followed first-order kinetics.
    • The combined system's removal kinetics were accurately predicted by integrating the models for S1 and S2.

    Conclusions:

    • The combined activated carbon-biomass system is highly effective for hexavalent chromium removal.
    • Mathematical models accurately describe the kinetics of Cr(VI) removal in individual and combined systems.
    • This study provides valuable insights for optimizing wastewater treatment processes for toxic metal removal.