Abstarct: Sulfate is one of the main anions present in natural waters and wastewater. Sulfate enters into the environment through natural, industrial, and mining processes including weathering of minerals, boxy nation of sulfates in rocks, paper and pulp industries, and coal mining. The present study was conducted in order to investigate the removal of sulfate from aqueous media by electrocoagulation in which the effects of voltage, pH, flowrate, electrical current, and concentration were studied. The electrical energy consumption, percentage of sulfate removal, and economical aspects of two configurations namely uniform and non-uniform voltages were investigated. The experiments were conducted in a polyethylene reactor of 20*10* 6 (in cm) with walls of 1.6*6*5 cm. The electrodes were made of aluminum plate (Grade 1050) with dimension of 1*25*100 mm. The samples of different concentration of sulfate were pumped to the reactor by a peristaltic pump with flowrates of 10, 20, 30, and 40 mL/min. By applying the electrical current of different voltage to the electrodes, samples when collected from the effluent. According to the results the acidic environment is suitable for removal of sulfate by electrocoagulation. The result indicated that extending of retention time (by reduction of flow rate) and decreasing the initial concentration of sulfate, improves the sulfate removal rate. The highest sulfate removal for uniform voltages, 87%, achieved at 30 V of voltage and 10 ml/min of flow rate (retention time= 135 minutes), and pH = 5.5, when the initial concentration of sulfate was 500 mg/L. The study of the effect of applying electrodes with non-uniform voltage arrangements of 10, 20, 30 and 20, 10, 30 showed that the removal rates of sulfate are equal to 70% and 62% and electrical energy consumptions of 45.5 and 45 kWh respectively. The results of the economic evaluation of energy consumption in the electrocoagulation process for the removal of sulfate clarifies that although the coagulation process with non-uniform voltage arrangement and higher voltages is more effective, however, the energy consumed per unit of sulfate removed in the case uniform voltage of 10v is the lowest.