The electrochemical removal of metal ions from dilute aqueous solutions was investigated in this study by use of a spouted bed electrode. To design and construct the cell, the effective hydrodynamic characteristics of the cell including inlet nozzle diameter, and central duct height, weight and position were optimized by response surface methodology. The performance of the relevant cell was investigated for cadmium ion removal from 1 L of a solution with the initial concentration of 180 ppm cadmium ion in 0.5 M sodium sulfate with the initial pH of 4.4 by applying the electrical current density of 9.5 A/m 2 . The effects of operational parameters consisting cadmium ion initial concentration, electrolyte concentration, applied electrical current density and catholyte initial pH were also investigated by monitoring of cadmium ion concentration, instantaneous current efficiency, and the pHs of the catholyte and anolyte solutions with time. It was observed that the effect of catholyte initial pH and electrolyte concentration on the process is negligible. Applied electrical current must be optimized according to initial concentration of cadmium ion. A theoretical model was developed for the electrochemical removal of metal ion over the three-dimensional electrode surfaces which was validated by the experimental data. The most unique characteristic of this model is consideration of the simultaneous effects of mass transfer, charge transfer and electrochemical reaction on the process. It was then generalized and validated for multi-stage electrolysis, for the first time. The effect of enlargement of the cathode surface area on improvement of cadmium ion removal process in the spouted bed cell was studied. Enlargement of cathode surface area from 1000 to 1500 cm 2 resulted in a decrease of nearly 30% in both of the process time and the specific energy consumption. The multi-stage electrolysis process was also investigated to increase the cadmium ion final removal efficiency and to decrease the specific energy consumption. Application of a three-stage electrolysis process for a solution containing 270 ppm of cadmium ion, resulted in the removal of 99.9% cadmium ion in 135 minutes with the specific energy consumption of 2.29 kWh/kg, 23% less than the value of a single-stage process. For a solution with 180 ppm of cadmium ion, 99.9% of cadmium ion was removed with the specific energy consumption of 2.82 i.e., 30% less than that of a single-stage process. Finally the electrochemical removal of nickel and silver ions in the spouted bed reactor were investigated to study the validation of the developed model for these metal ions. The adjusted theoretical model was also confirmed for electrochemical removal of nickel and silver ions. It was necessary to increase the applied electrical current density from 5.8 to 14.4 A/m 2 by increasing nickel ion initial concentration from 56 to 179 ppm. Upon application of the process for silver ion recovery from a solution containing 150 ppm silver ion, it was observed that 99.9% of silver ion was recovered in 65 minutes with the specific energy consumption of 1.79 kWh/kg and the average current efficiency of 26.4% by applying the electrical current density of 9.5 A/m 2 . In order to decrease the specific energy consumption in this process, the oxygen evolution reaction in the anodic compartment was replaced by the anodic reaction of copper dissolution, for the first time. This resulted in a decrease of nearly 26% in the cell voltage and specific energy consumption of the process. It was observed that the efficient electrochemical removal of metal ions from dilute aqueous solutions is achieved using the constructed spouted bed cell. The performance of the cell can also be improved using the innovative methodologies containing multi-stage electrolysis and replacement of the anodic reaction by a more appreciate reaction. Key Words Electrochemical removal, Dilute aqueous solutions, Spouted bed electrode, Cadmium ion, Muti-stage electrolysis