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<p>Water reuse represents a critical strategy for alleviating pressure on freshwater resources and reducing reliance on energy-intensive desalination, yet urban wastewater frequently contains pharmaceutical residues, such as 5-aminosalicylic acid (5-ASA), which are resistant to conventional treatment methods. This study evaluates an integrated approach combining coagulation–flocculation, adsorption, and chlorination for the effective removal of 5-ASA from aqueous solutions. Aluminum sulfate was employed as a coagulant, while activated carbons derived from agricultural residues specifically bean peel (ACBP) and pea peel (ACPP) were used as cost-effective adsorbents. The study systematically examined the influence of key operational parameters, including coagulant dose, adsorbent mass, pH, chlorine dose, and contact time, on the removal efficiency of 5-ASA, both individually and in combination. Results demonstrated that the sequential integration of coagulation, adsorption, and chlorination significantly enhances pollutant removal, exceeding the efficiencies achieved by single-step treatments. Mechanistic analysis revealed that coagulation facilitated destabilization and aggregation of organic matter, adsorption provided high-capacity retention via electrostatic and surface interactions, and chlorination selectively degraded residual stable molecules. The findings underscore the potential of this integrated treatment as a sustainable, economical, and scalable strategy for the elimination of persistent organic contaminants from water. Furthermore, the use of agro-waste-derived activated carbons contributes to resource valorization, supporting circular economy principles and offering promising applications for advanced wastewater treatment and water reuse.</p>

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Optimizing 5-aminosalicylic acid removal from water through combined coagulation–flocculation, adsorption, and chlorination: comparative insights and synergy

  • 期刊论文

  • 发表日期：

    2026年5月9日

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  • A. Aitbara,
  • A. Mehellou,
  • A. Ouchene,
  • A. Herbadji,
  • I. Y. Bouderbala

摘要

Water reuse represents a critical strategy for alleviating pressure on freshwater resources and reducing reliance on energy-intensive desalination, yet urban wastewater frequently contains pharmaceutical residues, such as 5-aminosalicylic acid (5-ASA), which are resistant to conventional treatment methods. This study evaluates an integrated approach combining coagulation–flocculation, adsorption, and chlorination for the effective removal of 5-ASA from aqueous solutions. Aluminum sulfate was employed as a coagulant, while activated carbons derived from agricultural residues specifically bean peel (ACBP) and pea peel (ACPP) were used as cost-effective adsorbents. The study systematically examined the influence of key operational parameters, including coagulant dose, adsorbent mass, pH, chlorine dose, and contact time, on the removal efficiency of 5-ASA, both individually and in combination. Results demonstrated that the sequential integration of coagulation, adsorption, and chlorination significantly enhances pollutant removal, exceeding the efficiencies achieved by single-step treatments. Mechanistic analysis revealed that coagulation facilitated destabilization and aggregation of organic matter, adsorption provided high-capacity retention via electrostatic and surface interactions, and chlorination selectively degraded residual stable molecules. The findings underscore the potential of this integrated treatment as a sustainable, economical, and scalable strategy for the elimination of persistent organic contaminants from water. Furthermore, the use of agro-waste-derived activated carbons contributes to resource valorization, supporting circular economy principles and offering promising applications for advanced wastewater treatment and water reuse.