An Electrocoagulation Process Operated at Batch Recirculation Mode for Treatment of Refinery Wastewaters: Optimization via Response Surface Methodology

Document Type : Original Article


1 chemical Eng., collage of engineering , Baghdad university , Iraq, Baghdad

2 Chemical Engineering Department, College of Engineering, University of Baghdad, Baghdad, Iraq


The performance of an electrocoagulation process operated at a batch recirculation mode for treating petroleum refinery wastewater using aluminium as a sacrificial anode and stainless steel as a cathode was investigated. Effects of operating factors such as the applied voltage (15-30 V), flow rate (50-200 mL/min) and pH (4-10) on the chemical oxygen demand removal were investigated. Using Box-Behnken design (BBD), a mathematical model relating the essential operational parameters to chemical oxygen demand (COD) reduction was constructed . Results showed that chemical oxygen demand (COD) removal efficiency significantly increased with the increase in the applied voltage and with the increase in flow rate till the optimum value. Experimental chemical oxygen demand removal of 87.605% was attained at the optimized conditions (applied voltage=28.2 v, flow rate=200 mL/min, pH=7). Results showed that the successful of Box-Behnken design in determining the optimum condition for removal of chemical oxygen demand (COD).


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Volume 65, Issue 13 - Serial Number 13
Special Issue: Chemistry and Global Challenges
December 2022
  • Receive Date: 22 June 2022
  • Revise Date: 29 July 2022
  • Accept Date: 01 August 2022
  • First Publish Date: 01 August 2022