Optimization of the electro coagulation process for the removal of cadmium from aqueous solution using RSM

A certain of industrialized wastewater streams include heavy metal ions, should be efficiently removal before the reuse or discharge of treated waters could occur. In this work, the removal of cadmium from aqueous solution was carried out by electro coagulation using aluminum electrodes as anode and cathode. Electro coagulation cell of 1litter was used in this research. Several operating parameters on the removal efficiency of cadmium were investigated, such as initial pH, voltage, initial cadmium ion concentration, NaCl concentration, spacing between electrodes, and type of electrode . The Cd(II) concentration (50 ,100,150,200 ppm),( stirring speed 120 rpm) at room temperature . A pH was use to be a constant best value when studied the impact of voltage values were chosen as 6,10, and 14 increasing voltage increased Cd(II) removals significantly Removal of 30.1%, 94.1%, 97.4%. The optimum removal efficiency of 97.4 % was achieved at a voltage of 14 V and pH 5 using (Al/Al.) electrodes, within 60 min of operating time. The concentration of NaCl was 0.6 g/l with a 0. 5 cm spacing between the electrodes. Keywords— Cadmium, voltage, electro coagulation, RSM.