<p>This research focuses on addressing the environmental challenges posed by dairy wastewater problems using advanced oxidation processes (AOP). This study uses a composite of MIL-88&#xa0;A(Fe)/C with an electro-Fenton process to mitigate the organic pollutants in dairy wastewater. The MIL-88&#xa0;A(Fe)/C composite is synthesized by combining MIL88-A with carbon in a hydrothermal process, and its morphological characterization was investigated by spectroscopy and microscopy methods. The parameters of pH, time, composite concentration, and oxidizer concentration were optimized by the response surface method (RSM). In all experiments, the electrode distance was 3&#xa0;cm and the current density was 9&#xa0;A/m². A quadratic model was fitted to the data. Comparison of adjusted <i>R</i>² with predicted <i>R</i>² validated the model. Kinetic studies revealed it followed pseudo-second-order behavior. The optimum conditions for reducing COD in the electro-Fenton process were pH 7.0, contact time 102.6&#xa0;min, catalyst concentration MIL-88&#xa0;A(Fe)/C 0.5&#xa0;g/L, and oxidizing concentration of Na₂S₂O₈ 0.026&#xa0;M. Under these conditions, COD removal efficiency from the Isfahan Pegah Dairy factory’s wastewater was statistically equal to 86.6% and experimentally equal to 89%. The results of the electro-Fenton process using MIL-88&#xa0;A(Fe)/C composite, low-cost graphite, and titanium electrodes were competitive and promising compared to previous research on the Wastewater of Dairy Industries.</p>