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The removal of chromium ions was given attention because it was a dangerous pollutant to the environment. The chromium ions wastewater was studied by electrocoagulation method. In this research details with the influence of some variables on the removal of chromium ions using electrochemical technique. The test system was electrochemical reactor to know value of the chromium ions concentrations in wastewater to calculate its removal efficiency. The performance of the batch reactor for the chromium ion removal was determined by changing the values of voltage, temperature and chromium ion concentrations, where the behavior of the aluminum electrodes after the removal process. An aluminum electrodes are used in the electrocoagulation method for removal of chromium ions and an electrochemical system was designed to test three major factors that affect the removal process; applied voltage 10, 20 and 30v, temperatures 20, 30, 40 and 50°C, current density 0.5, 1.5, 3 and 5 mA/cm2 and pH is 1, 4, 7, 10 and 12. In this study, the removal efficiency increases with the increasing of the applied voltage and current density (i) also the results showed that the efficacy of removal increased with increasing temperature but increased with increasing pH it at low pH values 1 to 7 and then decreased with increasing pH at high pH values 7 to 12. The results also show that the energy consumed increases with the increase in the reaction time, the maximum removal efficiency is 94.5 at T = 50°C, v = 40 volts, pH = 7 and i = 5 mA/cm2. [ABSTRACT FROM AUTHOR]