The iodide electrolyte solution used in the laboratory experiment was an aqueous solution prepared with a 2.5 g/L I2 (Merck) and 10 g/L KI (Merck) concentration. While, the WPCB iodide leachate was an aqueous solution prepared by sequentially leaching pulverised WPCBs (2/2mm cm particle size) in 0.2 M nitric acid/ HNO3 lixiviant (for 45 min at 500 g/L S/L, 18 rpm agitation rate, and 90 o C temp), 3.5 M hydrochloric acid/ HCl lixiviant (for 120 min, at 500 g/L S/L, 18 rpm agitation rate, and 90 o C temp), 2M sulphuric acid/ H2SO4 and 2M hydrogen peroxide/ H2O2 lixiviant (for 3 hrs, at 500 g/L S/L, 18 rpm agitation rate, and 25 o C temp), and finally 2.5 g/L I2, 10 g/L I -, and 10 g/L H2O2 lixiviant (for 4 hrs at 500 g/L S/L, 18 rpm agitation rate, 25 o C temp, and pH 6). The observed metal leaching yields and metal concentrations in the leachates produced after each respective leaching stage are presented in Table and. These yields and concentrations were determined through ICP-OES chemical analysis. It is important to note that all leaching stages were performed 3 times under a single set of operating conditions, and the reported metal concentrations are set averages, with their repeatability evaluated through standard deviation.