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<p>Oily-wastewater discharged leading to environmental oil contamination with disastrous consequences to aquatic life. Persistent oil-in-wastewater presents significant treatment challenges that need to be addressed. While the issue of fresh oil has been extensively studied, little attention focused on waste oil. Hence, comprehensive electrocoagulation study focusing on parameter interactions and mechanism elucidation are provided in this study. Using response surface methodology with central composite design, interactions among initial pH, electrolyte dosage, applied voltage, and initial oil concentration were investigated in treating waste oil-in-water emulsion. Oil content was quantified using UV–Vis spectrophotometry, while electrochemical impedance spectroscopy and cyclic voltammetry analysed electrochemical behaviours. The Verhulst logistic model was adapted to determine the mechanism and kinetic parameters. An oil removal efficiency of 98.11% was attained under the optimal conditions of pH 6.4, supporting electrolyte of 1.228&#xa0;g/L, applied voltage of 3.251&#xa0;V and an initial concentration of oil 1.259&#xa0;g/L. Based on electrochemical impedance spectroscopy and cyclic voltammetry, the results revealed that oil removal process involves non-ideal capacitance and irreversible electron transfer process. Higher voltage and higher electrolyte improved the removal efficiency, while increased oil concentration hindered the performance. The initial pH range of 5–9 showed no significant effect on removal efficiency. In kinetic analysis, it was revealed that there are four removal phases: lag, exponential, deceleration, and saturation; thereby making the treatment process more comprehensive. Overall, this study provides insights into electrocoagulation mechanism of waste cooking oil removal which could lead to advanced sustainable wastewater treatment technologies.</p>

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Electrochemical and kinetic insights into waste cooking oil removal via electrocoagulation: parameter interactions and mechanism elucidation

  • 期刊论文

  • 发表日期：

    2025年3月17日

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  • J. A. L. Soo,
  • N. F. Shoparwe,
  • L. S. Tan,
  • P. L. Kiew,
  • A. K. Nurulbahiyah,
  • Y. F. Yeong

摘要

Oily-wastewater discharged leading to environmental oil contamination with disastrous consequences to aquatic life. Persistent oil-in-wastewater presents significant treatment challenges that need to be addressed. While the issue of fresh oil has been extensively studied, little attention focused on waste oil. Hence, comprehensive electrocoagulation study focusing on parameter interactions and mechanism elucidation are provided in this study. Using response surface methodology with central composite design, interactions among initial pH, electrolyte dosage, applied voltage, and initial oil concentration were investigated in treating waste oil-in-water emulsion. Oil content was quantified using UV–Vis spectrophotometry, while electrochemical impedance spectroscopy and cyclic voltammetry analysed electrochemical behaviours. The Verhulst logistic model was adapted to determine the mechanism and kinetic parameters. An oil removal efficiency of 98.11% was attained under the optimal conditions of pH 6.4, supporting electrolyte of 1.228 g/L, applied voltage of 3.251 V and an initial concentration of oil 1.259 g/L. Based on electrochemical impedance spectroscopy and cyclic voltammetry, the results revealed that oil removal process involves non-ideal capacitance and irreversible electron transfer process. Higher voltage and higher electrolyte improved the removal efficiency, while increased oil concentration hindered the performance. The initial pH range of 5–9 showed no significant effect on removal efficiency. In kinetic analysis, it was revealed that there are four removal phases: lag, exponential, deceleration, and saturation; thereby making the treatment process more comprehensive. Overall, this study provides insights into electrocoagulation mechanism of waste cooking oil removal which could lead to advanced sustainable wastewater treatment technologies.