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<p>This work examines how the physical and chemical properties of waste cooking oil (WCO) evolve throughout a bentonite-based recycling treatment conducted under low-intensity conditions (10 wt% dosage, 4&#xa0;h contact time). The primary aim is to track the progression of critical quality indicators, including turbidity, viscosity, density, colour, and molecular composition, during treatment, with emphasis placed on oil transformation rather than characterization of the adsorbent material. WCOs samples were recycling by employing a known methodology involving Algerian bentonite. As result of the treatment, turbidity decreased from 69 to 13 NTU (81% reduction), and viscosity dropped from 120&#xa0;mPa·s to 90&#xa0;mPa·s (25% decrease), while density was significantly reduced, approaching values of fresh oil. FTIR spectroscopy revealed increased transmittance at key bands (e.g., 3010, 2854, and 722&#xa0;cm<sup>−1</sup>), indicating removal of conjugated and oxidized compounds, while the relative stability of the 1744&#xa0;cm<sup>−1</sup> band confirmed preservation of the triglyceride backbone. Rheological measurements showed a transition from non-Newtonian shear-thickening behaviour to Newtonian flow, reflecting a substantial decline in high-molecular-weight degradation products. Visual assessment confirmed a marked improvement in oil clarity, corresponding with the removal of suspended solids and thermally degraded compounds. These multi-parameter findings provide a comprehensive understanding of the degradation and recovery processes involved in WCO treatment, supporting the feasibility of low-cost oil recycling methods for sustainable reuse in non-food applications.</p>

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Monitoring of physicochemical changes during recycling of frying oil using natural bentonite

  • 期刊论文

  • 发表日期：

    2026年2月15日

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  • A. Serouri,
  • Z. Taleb,
  • A. Mannu,
  • G. L. Petretto,
  • C. N. Kedir,
  • C. H. Memou,
  • S. Garroni,
  • A. Mele,
  • O. Zinai,
  • S. Taleb

摘要

This work examines how the physical and chemical properties of waste cooking oil (WCO) evolve throughout a bentonite-based recycling treatment conducted under low-intensity conditions (10 wt% dosage, 4 h contact time). The primary aim is to track the progression of critical quality indicators, including turbidity, viscosity, density, colour, and molecular composition, during treatment, with emphasis placed on oil transformation rather than characterization of the adsorbent material. WCOs samples were recycling by employing a known methodology involving Algerian bentonite. As result of the treatment, turbidity decreased from 69 to 13 NTU (81% reduction), and viscosity dropped from 120 mPa·s to 90 mPa·s (25% decrease), while density was significantly reduced, approaching values of fresh oil. FTIR spectroscopy revealed increased transmittance at key bands (e.g., 3010, 2854, and 722 cm−1), indicating removal of conjugated and oxidized compounds, while the relative stability of the 1744 cm−1 band confirmed preservation of the triglyceride backbone. Rheological measurements showed a transition from non-Newtonian shear-thickening behaviour to Newtonian flow, reflecting a substantial decline in high-molecular-weight degradation products. Visual assessment confirmed a marked improvement in oil clarity, corresponding with the removal of suspended solids and thermally degraded compounds. These multi-parameter findings provide a comprehensive understanding of the degradation and recovery processes involved in WCO treatment, supporting the feasibility of low-cost oil recycling methods for sustainable reuse in non-food applications.