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Sorption of basic dyes from aqueous solution by activated sludge.

Osman Gulnaz1, Aysenur Kaya, Fatih Matyar

  • 1Department of Biology, Faculty of Arts and Sciences, Cukurova University, 01330 Balcali, Adana, Turkey. ogulnaz@cu.edu.tr

Journal of Hazardous Materials
|May 4, 2004
PubMed
Summary

Dried activated sludge effectively removes Basic Red 18 and Basic Blue 9 dyes from wastewater. This study highlights activated sludge

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Area of Science:

  • Environmental Science
  • Water Treatment
  • Adsorption Technology

Background:

  • Wastewater treatment requires efficient methods for dye removal.
  • Activated sludge is a potential biosorbent for industrial dye effluents.
  • Basic Red 18 and Basic Blue 9 are common textile dyes.

Purpose of the Study:

  • To investigate the dye uptake capacity of dried activated sludge.
  • To evaluate the adsorption equilibrium and kinetics of Basic Red 18 and Basic Blue 9.
  • To assess the feasibility of activated sludge as a biosorbent for dye removal.

Main Methods:

  • Batch adsorption experiments were conducted using dried activated sludge.
  • Adsorption isotherms were analyzed using Langmuir and Freundlich models.

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  • Adsorption kinetics were studied using pseudo-first-order and pseudo-second-order models.

    • Main Results:

    • Activated sludge exhibited high monolayer adsorption capacities: 285.71 mg/g for Basic Red 18 and 256.41 mg/g for Basic Blue 9.
    • Adsorption equilibrium data fitted well with both Langmuir and Freundlich models.
    • Adsorption kinetics followed a pseudo-second-order model, indicating chemisorption.

    Conclusions:

    • Dried activated sludge is a highly effective and favorable biosorbent for removing Basic Red 18 and Basic Blue 9.
    • The adsorption process is well-described by both Langmuir and Freundlich isotherms and pseudo-second-order kinetics.
    • Activated sludge presents a promising, cost-effective solution for dye decolorization in wastewater treatment.