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<p>The coagulant-flocculant capacity of <i>Opuntia ficus-indica</i> for wastewater treatment has been widely documented, yet its industrial application remains limited due to insufficient research on pre-industrialization factors. This study investigates the critical aspect of raw material storage by examining cladodes stored under three conditions: open-air (12.7&#xa0;°C average, 28–99% RH), incubator (25&#xa0;°C), and refrigerator (5&#xa0;°C) over 1 month. Results showed significant mass loss variations: open-air samples with double-cut surfaces (S1’ S2’) exhibited the highest mass reduction (87.96%), while single-cut samples (S1 S2) demonstrated optimal preservation (16.34% loss). Controlled environments showed intermediate losses (72.62% at 25&#xa0;°C; 53.73% at 5&#xa0;°C). Compositional analysis revealed polysaccharide degradation in temperature-controlled samples, whereas open-air-stored material maintained structural integrity. Performance testing recorded settling velocities of 3.7&#xa0;cm/min (open-air), 1.6&#xa0;cm/min (incubator), and 2.5&#xa0;cm/min (refrigerator) samples. Mechanistic studies identified that the coagulant-flocculant activity derives from polysaccharide-polyphenol complexes operating through dual mechanisms: (1) charge neutralization of colloidal clay particles and (2) polymer bridging between flocculated particles. These findings provide essential guidelines for optimizing storage conditions to preserve OFI bioactive compounds, facilitating its potential for sustainable wastewater treatment applications.</p> Graphical Abstract <p></p>

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Impact of storage conditions of Opuntia ficus-indica pieces on plant quality, powder composition, and extracted bioflocculant efficiency

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • Khadija Meftah,
  • Said Meftah,
  • Ibtissam Ballou,
  • Taoufiq Bouzid,
  • Salah Touil,
  • Aziza Abid

摘要

The coagulant-flocculant capacity of Opuntia ficus-indica for wastewater treatment has been widely documented, yet its industrial application remains limited due to insufficient research on pre-industrialization factors. This study investigates the critical aspect of raw material storage by examining cladodes stored under three conditions: open-air (12.7 °C average, 28–99% RH), incubator (25 °C), and refrigerator (5 °C) over 1 month. Results showed significant mass loss variations: open-air samples with double-cut surfaces (S1’ S2’) exhibited the highest mass reduction (87.96%), while single-cut samples (S1 S2) demonstrated optimal preservation (16.34% loss). Controlled environments showed intermediate losses (72.62% at 25 °C; 53.73% at 5 °C). Compositional analysis revealed polysaccharide degradation in temperature-controlled samples, whereas open-air-stored material maintained structural integrity. Performance testing recorded settling velocities of 3.7 cm/min (open-air), 1.6 cm/min (incubator), and 2.5 cm/min (refrigerator) samples. Mechanistic studies identified that the coagulant-flocculant activity derives from polysaccharide-polyphenol complexes operating through dual mechanisms: (1) charge neutralization of colloidal clay particles and (2) polymer bridging between flocculated particles. These findings provide essential guidelines for optimizing storage conditions to preserve OFI bioactive compounds, facilitating its potential for sustainable wastewater treatment applications.

Graphical Abstract