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<p>Despite the ecological and economic significance of marine resources in the Gulf of Gabes, Tunisia, untreated phosphogypsum has been systematically discharged straight into the open sea by the Groupe Chimique Tunisien plants since 1972. Consequently, the environmental degradation resulting by phosphogypsum effluents has become a pressing global issue. The quest for effective methods to mitigate environmentally harmful elements has long captured significant attention. This study explores a novel approach to eliminating phosphate and fluoride from phosphogypsum leachate. Clay, a readily available natural resource, functions as the most budget-friendly medium for this purpose, utilizing a CSTR. The clay used was sourced from Douiret, Tataouine (Tunisia) and was employed in raw and activated states. Dynamic tests carried out in the laboratory-scale reactors examined the impact of varying inflow rates (20, 40, and 80&#xa0;mL/min) and the efficacy of employing two CSTRs on the removal of pollutants (phosphate and fluoride). Findings suggest that the removal of phosphate and fluoride from phosphogypsum leachate is contingent upon the influent flow rate and, notably, the number of CSTRs utilized. Specifically, employing two reactors in series at a flow rate of around 20&#xa0;mL/min achieved an extraordinary phosphate elimination efficiency (82%) and fluoride (83%) using organoclay. In comparison with traditional method, this innovative CSTR system presents substantial benefits for wastewater purification. Ultimately, it is recommended to conduct comprehensive pilot studies on a larger scale to validate these encouraging experimental findings.</p>

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Dynamic adsorption for the efficient removal of phosphate and fluoride from phosphogypsum leachate

  • 期刊论文

  • 发表日期：

    2025年8月6日

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  • Kawthar Yahya,
  • Ammar Mlayah,
  • Hiba Tlili,
  • Boulanoir Lissir,
  • Ezzeddine Srassra,
  • Noureddine Hamdi

摘要

Despite the ecological and economic significance of marine resources in the Gulf of Gabes, Tunisia, untreated phosphogypsum has been systematically discharged straight into the open sea by the Groupe Chimique Tunisien plants since 1972. Consequently, the environmental degradation resulting by phosphogypsum effluents has become a pressing global issue. The quest for effective methods to mitigate environmentally harmful elements has long captured significant attention. This study explores a novel approach to eliminating phosphate and fluoride from phosphogypsum leachate. Clay, a readily available natural resource, functions as the most budget-friendly medium for this purpose, utilizing a CSTR. The clay used was sourced from Douiret, Tataouine (Tunisia) and was employed in raw and activated states. Dynamic tests carried out in the laboratory-scale reactors examined the impact of varying inflow rates (20, 40, and 80 mL/min) and the efficacy of employing two CSTRs on the removal of pollutants (phosphate and fluoride). Findings suggest that the removal of phosphate and fluoride from phosphogypsum leachate is contingent upon the influent flow rate and, notably, the number of CSTRs utilized. Specifically, employing two reactors in series at a flow rate of around 20 mL/min achieved an extraordinary phosphate elimination efficiency (82%) and fluoride (83%) using organoclay. In comparison with traditional method, this innovative CSTR system presents substantial benefits for wastewater purification. Ultimately, it is recommended to conduct comprehensive pilot studies on a larger scale to validate these encouraging experimental findings.