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<p>The purpose of this study is to assess the efficacy of an integrated system for treating tannery effluents from Fez City. The system includes aeration as a pretreatment, followed by a binary oxidation process using hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) and persulfate (K<sub>2</sub>S<sub>2</sub>O<sub>8</sub>) (PS) as oxidants, with UV-A irradiation, and ultrasound (US) as activators (US-UV-PS-H<sub>2</sub>O<sub>2</sub>). Aeration effectiveness as a preliminary treatment was evaluated, resulting in a 71% and 78% reduction in chemical organic demand (COD) and color, respectively. The US-UV-PS-H<sub>2</sub>O<sub>2</sub> process effectiveness was further evaluated in terms of COD and color removal. A factorial design with two levels was used to optimize the operating parameters (pH, H<sub>2</sub>O<sub>2</sub> concentration, and K<sub>2</sub>S<sub>2</sub>O<sub>8</sub> dose). The findings showed that, under optimal conditions (pH = 3; [H<sub>2</sub>O<sub>2</sub>] = 225&#xa0;mg/L and [K<sub>2</sub>S<sub>2</sub>O<sub>8</sub>] = 3670&#xa0;mg/L), the highest COD and color reduction rates in the tannery effluent were 85% and 93%, respectively. Additionally, phytotoxicity assessments, based on seed germination and root elongation tests, revealed promising results in toxicity reduction, with a germination rate of 75% for both <i>M. sativa</i> and <i>wheat seeds</i>. Overall, the sequential treatment involving aeration followed by US-UV-PS-H<sub>2</sub>O<sub>2</sub> process proves to be an effective and practical strategy for the sustainable management of tannery wastewater, with a total treatment cost of $8.07/m<sup>3</sup>.</p>

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Treatment of Real Tannery Industrial Wastewater via Sequential Biological and US/UV/activated Persulfate-Hydrogen Peroxide Processes

  • 期刊论文

  • 发表日期：

    2025年4月2日

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  • Oumaima Bahammou,
  • Imane Tazi,
  • Imane El Mrabet,
  • Mostafa Nawdali,
  • Karim Tanji,
  • Fouad Khalil,
  • Corinne Ferronato,
  • Mourad Benzina,
  • Hicham Zaitan

摘要

The purpose of this study is to assess the efficacy of an integrated system for treating tannery effluents from Fez City. The system includes aeration as a pretreatment, followed by a binary oxidation process using hydrogen peroxide (H2O2) and persulfate (K2S2O8) (PS) as oxidants, with UV-A irradiation, and ultrasound (US) as activators (US-UV-PS-H2O2). Aeration effectiveness as a preliminary treatment was evaluated, resulting in a 71% and 78% reduction in chemical organic demand (COD) and color, respectively. The US-UV-PS-H2O2 process effectiveness was further evaluated in terms of COD and color removal. A factorial design with two levels was used to optimize the operating parameters (pH, H2O2 concentration, and K2S2O8 dose). The findings showed that, under optimal conditions (pH = 3; [H2O2] = 225 mg/L and [K2S2O8] = 3670 mg/L), the highest COD and color reduction rates in the tannery effluent were 85% and 93%, respectively. Additionally, phytotoxicity assessments, based on seed germination and root elongation tests, revealed promising results in toxicity reduction, with a germination rate of 75% for both M. sativa and wheat seeds. Overall, the sequential treatment involving aeration followed by US-UV-PS-H2O2 process proves to be an effective and practical strategy for the sustainable management of tannery wastewater, with a total treatment cost of $8.07/m3.