Unmanageable industrial wastewater will have an impact on the environment. One of the alternative wastewater treatment technologies is electrocoagulation. This study investigates the effects of voltage, time, and NaCl concentrations on wastewater through electrocoagulationspecifically, how they affect the total suspended solid (TSS), the total dissolved solid (TDS), and the chemical oxygen demand (COD) reduction of palm oil mill effluent (POME)-with response surface methodology. An iron electrode was used with a time variation of 15, 30, and 45 minutes; a voltage variation of 10, 15, and 20 volts; and NaCl concentrations of 0.0, 0.5, and 1.0 M. A Box-Behnken design in the response surface method formed the model and optimized the electrocoagulation. Optimization of COD, TSS, and TDS reductions with the response surface methodology was accomplished at 93.12%, 97.70%, and 41.06% respectively, in 37 minutes with 20 volts, and no NaCl concentration. The analysis of variance (ANOVA) showed that the quadratic model, with the R 2 coefficients of COD, TSS, and TDS at 0.99, 0.97, and 0.92, respectively, and the adjusted-R 2 values at 0.97, 0.94, and 0.83, respectively. Conformity testing for the optimum conditions proved the model's validity, yielding COD, TSS, and TDS reduction efficiency at 93.27%, 97.64%, and 40.78%, respectively. The results of this study were useful for predicting and controlling the COD, TSS, and TDS removal efficiencies in different conditions, and they will provide information on wastewater disposal's impact on the environment without going through the first processing stage. Therefore, electrocoagulation is a more economical POME processing technique.
