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This study aimed to repurpose two solid industrial wastes as adsorbents, replacing raw materials and promoting an effective circular economy. The investigated wastes included blast furnace slag and coke fines sourced from an integrated steel plant. Their adsorption performance was assessed for the removal of fluoride and COD from the effluent of an industrial wastewater treatment facility. The initial COD concentration was 216.49 mg/L, while the fluoride concentration was 36.92 mg/L. Blast furnace slag underwent activation using a commercial aluminum product containing 10% Al₂O₃, with solution concentrations ranging from 0.1 M to 0.5 M. Thermal activation was carried out at temperatures between 550 °C and 800 °C. The highest adsorption efficiency was achieved with activation at 800 °C and a 0.5 M aluminum solution, resulting in a reduction of COD to 123.02 mg/L (43% removal efficiency) and fluoride concentration to 3.4 mg/L (90.70% removal efficiency). Similarly, coke fines were chemically activated using the same commercial aluminum product at concentrations between 0.1 M and 0.5 M. The optimal results were obtained with a 0.2 M aluminum solution, reducing COD to 97.22 mg/L (55% removal efficiency) and fluoride concentration in the final effluent to 2.56 mg/L (93.1% removal efficiency).

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Use of Residual Materials in Adsorption and Tertiary Treatment Processes for Industrial Wastewater

  • 会议论文

  • 发表日期：

    2026年

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  • Carlos M. Llamedo,
  • Lara D. Sánchez,
  • Deva R. Jove,
  • Laura Megido,
  • Yolanda Fernández-Nava,
  • A. Fatemeh,
  • Jesús A. Rodríguez-Iglesias

摘要

This study aimed to repurpose two solid industrial wastes as adsorbents, replacing raw materials and promoting an effective circular economy. The investigated wastes included blast furnace slag and coke fines sourced from an integrated steel plant. Their adsorption performance was assessed for the removal of fluoride and COD from the effluent of an industrial wastewater treatment facility. The initial COD concentration was 216.49 mg/L, while the fluoride concentration was 36.92 mg/L. Blast furnace slag underwent activation using a commercial aluminum product containing 10% Al₂O₃, with solution concentrations ranging from 0.1 M to 0.5 M. Thermal activation was carried out at temperatures between 550 °C and 800 °C. The highest adsorption efficiency was achieved with activation at 800 °C and a 0.5 M aluminum solution, resulting in a reduction of COD to 123.02 mg/L (43% removal efficiency) and fluoride concentration to 3.4 mg/L (90.70% removal efficiency). Similarly, coke fines were chemically activated using the same commercial aluminum product at concentrations between 0.1 M and 0.5 M. The optimal results were obtained with a 0.2 M aluminum solution, reducing COD to 97.22 mg/L (55% removal efficiency) and fluoride concentration in the final effluent to 2.56 mg/L (93.1% removal efficiency).