<![CDATA[Water pollution contributes to water crises at the global level by reducing the quantity and quality of freshwater resources available to humans and ecosystems. Agricultural wastewater can contain chemicals such as pesticides, herbicides, fertilizers, and organic matter. If discharged without treatment, it can contaminate water sources such as rivers, lakes, and groundwater. This study aims to optimize operating parameters in the form of voltage, electrocoagulation time, and calcium concentration to maximize the removal rate of nitrogen compounds in agricultural wastewater. This study used response surface methodology (RSM) to optimize the operational conditions of electrocoagulation and achieve a high level of allowance without the need for additional coagulants from outside. The results showed that the lowest nitrate concentration was 2.960 mg/L (an 88.37% reduction from the initial concentration) under the conditions of 45 V voltage, 15 minutes of electrocoagulation time, and a calcium concentration of 7 mg/L.. The lowest ammonia concentration was 0.016 mg/L (99.37%) at variations in voltage, electrocoagulation time, and calcium concentration of 30 V, 1.5 minutes, and 4.5 mg/L, respectively. The addition of calcium can react with ions produced from the anode to form coagulants, such as calcium hydroxide, which helps remove nitrogen compounds. The optimal operating conditions for EC to set aside nitrate and ammonia concentrations of 3.709 mg/L and 1.338 mg/L, respectively, are 45 V, 15 minutes, and calcium concentrations are 5.09 mg/L. Agricultural wastewater treatment using EC succeeded in removing iron up to 96.73% of the initial concentration. The magnesium concentration is very low at 0.001 mg/L]]>
