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<p>The treatment of syrup, particularly from the candy-coating process, poses a challenge due to their high sugar content and pigmentation, which are resistant to traditional treatment methods. This study explores the application of Advanced Oxidation Processes (AOPs) for the effective degradation of pigments. We investigated the catalytic decomposition of hydrogen peroxide (H₂O₂) using lime and ferrous ammonium sulfate as promoters to enhance oxidation. A complete 2<sup>2</sup> factorial design was employed to optimize the conditions for color removal. Results indicate that the presence of hydroxyl radicals, generated via AOPs, significantly improves the removal of pigmentation and mineralization of organic content. Specifically, the optimal concentrations of lime (9.0–13.0&#xa0;g L⁻<sup>1</sup>) and hydrogen peroxide (1000–2300&#xa0;mg L⁻<sup>1</sup>) led to effective color removal and reduction in total organic carbon. Ferrous ammonium sulfate showed higher efficiency in organic load reduction, while lime excelled in pigmentation removal. The empirical model developed demonstrated a high explanatory power (approximately 98%), validating the effectiveness of the proposed methodology. This methodology is simple, efficient, and suitable for treating effluents with pigmentation, offering a practical solution for industrial applications.</p>

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Enhanced syrup treatment: optimization of Fenton and Fenton-like processes using lime and Fe(II) catalysts

  • 期刊论文

  • 发表日期：

    2025年1月7日

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  • D. Moretto,
  • C. E. Demaman Oro,
  • G. B. Grass,
  • L. D. Venquiaruto,
  • M. Di Luccio,
  • R. M. Dallago

摘要

The treatment of syrup, particularly from the candy-coating process, poses a challenge due to their high sugar content and pigmentation, which are resistant to traditional treatment methods. This study explores the application of Advanced Oxidation Processes (AOPs) for the effective degradation of pigments. We investigated the catalytic decomposition of hydrogen peroxide (H₂O₂) using lime and ferrous ammonium sulfate as promoters to enhance oxidation. A complete 22 factorial design was employed to optimize the conditions for color removal. Results indicate that the presence of hydroxyl radicals, generated via AOPs, significantly improves the removal of pigmentation and mineralization of organic content. Specifically, the optimal concentrations of lime (9.0–13.0 g L⁻1) and hydrogen peroxide (1000–2300 mg L⁻1) led to effective color removal and reduction in total organic carbon. Ferrous ammonium sulfate showed higher efficiency in organic load reduction, while lime excelled in pigmentation removal. The empirical model developed demonstrated a high explanatory power (approximately 98%), validating the effectiveness of the proposed methodology. This methodology is simple, efficient, and suitable for treating effluents with pigmentation, offering a practical solution for industrial applications.