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Typically, to treat landfill leachate, biological techniques alone are not sufficient. In this study, Fenton process was found to be effective as a pretreatment method. Analytic hierarchy process (AHP) was used to select the favorable catalyst between FeSO₄ and FeCl₂ when three criteria, namely, (i) COD removal, (ii) sludge to iron ratio, and (iii) risk were considered. Meanwhile, response surface methodology was applied to model and optimize three target responses, (i) COD removal, (ii) sludge to iron ratio, and (iii) organic removal to sludge ratio. The effective variables included pH, [H₂O₂]/[Fe²⁺], Fe²⁺ dosage and reaction time. In addition, to minimize the danger, generated sludge was reused in the Fenton process. According to AHP sensitivity analysis results, priority percentage for FeCl₂ and FeSO₄ were 64% and 36%, respectively. Additionally, according to the statistical analysis, all suggested models were …