Peroxi-Electrocoagulation process for the treatment of simulated dye wastewater: A comparison study

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Mohammed Najim Abdullah, Asrar Abdullah Hassan

Abstract

The present work was conducted to make a comparison among two types of electrochemical processes [peroxi- coagulation (PC), peroxi- electrocoagulation (PEC)] that have been used for the treatment of simulated dye wastewater using a lab-scale batch electrochemical cell. In the peroxi-coagulation (PC), peroxi-electrocoagulation (PEC)processes, stainless steel anode and porous graphite cathode were used in both processes.At the peroxi-coagulation process, Impacts of operating parameters like current density (4-36 mA/cm2), air aeration(0.5-2.5 l/min), pH (3-9), and time (20–120min) on the elimination efficiency color were examined with the use of response surface methodology (RSM) combined with Box–Behnken design (BBD). The optimum conditions were found to be an initial value of the pH equal to (3), current density of 36 mA/cm2,air aeration equal to 1.5 l/min, and time duration of 120 min, where color removal efficiency of 98.76% was achieved and energy consumption of 10.54 kWh/k g was required. At the peroxi- electrocoagulation process, impact of operating factors like current density (4-36 mA/cm2),H2O2 concentration (20-100 g/l), ph (1-5), and time (10– 30min) on the color removal were studied using RSM combined with BBD. The optimal operating parameters were determined to be H2O2 concentration of 100 g/l, current density of 20 A/cm2, duration of 10 min, and pH of 3., where color removal efficiency of 99.92% was achieved and energy consumption of 0.45 kWh/kg was needed. Results showed that the PEC is more effective than PC where quantity of energy consumption in PEC less than in PC process we can consider the PEC process is the most successful for removal the dye from wastewater.

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