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Adsorption of Phosphate from Aqueous Solution Using Activated Red Mud

Pradhan1, Das, Das

  • 1Regional Research Laboratory, Council of Scientific & Industrial Research, Bhubaneswar, 751 013, India

Journal of Colloid and Interface Science
|December 16, 1998
PubMed
Summary

Activated red mud effectively removes phosphate from water, achieving 80-90% efficiency at room temperature. This method shows promise for treating industrial wastewater, particularly from fertilizer plants.

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Area of Science:

  • Environmental Chemistry
  • Water Treatment Technologies
  • Adsorption Science

Background:

  • Phosphate pollution is a significant environmental concern, contributing to eutrophication in water bodies.
  • Industrial effluents, especially from phosphatic fertilizer plants, are major sources of phosphate discharge.
  • Effective and economical methods for phosphate removal are crucial for environmental protection.

Purpose of the Study:

  • To investigate the adsorption of phosphate (PO3-4) from aqueous solutions using activated red mud (ARM).
  • To evaluate the influence of various parameters on phosphate adsorption efficiency.
  • To assess the applicability of ARM for industrial wastewater treatment.

Main Methods:

  • Adsorption experiments were conducted using activated red mud as the adsorbent.

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  • The study systematically varied parameters such as time, pH, temperature, and concentrations of adsorbent and adsorbate.
  • Phosphate adsorption was analyzed using Langmuir and Freundlich adsorption isotherm models.

    • Main Results:

    • Phosphate adsorption on ARM was observed to be dependent on time, pH, temperature, and concentrations.
    • The adsorption process followed both Langmuir and Freundlich adsorption isotherms.
    • High process efficiency, ranging from 80% to 90%, was achieved at room temperature.

    Conclusions:

    • Activated red mud is an effective adsorbent for removing phosphate from aqueous solutions.
    • The adsorption characteristics align with established isotherm models, indicating predictable performance.
    • The high efficiency and cost-effectiveness suggest ARM is a viable solution for treating phosphate-rich industrial effluents.