A rotating tubular packed bed electrochemical reactor was used for the electrochemical removal of cadmium (Cd) from simulated wastewater. Impacts of electrolysis operating parameters: current (0.56–2.8 A), rotation speed (100–500 rpm), initial cadmium concentration (20–100 ppm), and pH (3-9) were investigated. Response surface methodology and Box-Behnken design were used for optimizing the process parameters where cadmium Removal Efficiency (RE %) was selected as a response function. Findings of the present work suggested that currently has a main impact on the removal efficiency of cadmium followed by rotation speed, then concentration and pH. The results of the regression analysis showed that experimental data could be fitted to a second-degree polynomial model with value of the determination coefficient (R2) equal to 91.8 %. Optimal conditions for process parameters based on the RSM model were initial Cd concentration of 32.0 ppm, current of 2.8 A, rotation speed of 371 rpm and pH = 3, where a final cadmium concentration less than 0.3 ppm was obtained after 30 min of electrolysis process (RE= 99.28% ).
Phenol removal from simulated wastewater by indirect electrochemical oxidation was investigated using a rotating tubular packed bed electrochemical reactor. Effects of operating parameters like current density (3-15mA/cm 2 ), rotation speed (100-500 rpm), initial phenol concentration (20-100ppm), and pH (3-9) were investigated. Optimization of the process parameters was carried out by adopting response surface methodology (RSM) combined with Box-Behnken Design (BBD) where COD removal efficiency (RE %) was selected as a response function. The results indicated that initial phenol concentration has the main effect on the COD removal efficiency followed by current density then pH and rotation speed. The results of regression analysis revealed that the experimental data could be fitted to a second-order polynomial model with a value of determination coefficient (R 2 ) equal to 98.38% .The optimum conditions of the process parameters based on RSM method were an initial phenol concentration of 41 ppm, current density of (9.3 mA/cm 2 ), rotation speed of 367 rpm and pH = 3 where COD removal efficiency of ( 99.83%) was accomplished after 60 min of electrochemical oxidation process in which current efficiency of (9.87%) was observed and energy consumption of (179.86 KWh/Kg COD) was required.
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