This study aimed to apply Fenton’s reagent to the effluent of edible oil and ghee mills for the evaluation of the removal of heavy metals. Primarily, Fenton regent (iron sulfate and hydrogen peroxide) is used for the oxidation of organics present in wastewater. In this manuscript, it is evaluated for the removal of heavy metals to see whether there is an increase or decrease in heavy metal contents. For this purpose, wastewater samples were collected from the main outlet drain of the industry. The sample was analyzed for physical, chemical, and heavy metals before and after treatment. Fenton reagent was applied, in which different doses of FeSO₄/H₂O₂ (Fenton) were prepared, i.e., 0.5:1 to 2:4 mol FeSO₄ and H₂O₂, respectively, and were applied to 100 mL of wastewater samples. The percentage removal of turbidity and COD was 94.7% and 97.8%, respectively. The percentage removal of Ni and Pb was 99% and 25%, respectively. A significant difference was found between and among the groups according to the post-hoc LSD comparison. It is therefore concluded that Fenton can be used effectively for the treatment of effluents by edible oil and ghee mills. The recommended dose was identified as 2:4 mol of FeSO₄/H₂O₂.

Keywords: Fenton Reagent, COD, Heavy Metals, Reflux Condensation, wastewater treatment