Optimizing the process of chemical coagulation and electrocoagulation in the treatment of Shahid Tandgoyan petrochemical wastewater

Subject Areas :

hamid reza  nooraeinia ¹ (M.Sc. Student of Department of Chemical Engineering, Mahshahr Branch, Islamic Azad University, Mahshahr, Iran.)
SOMAYEH  Torani ² (Assistant Prof. of Departmen of Chemical Engineering, Mahshahr Branch, Islamic Azad University, Mahshahr, Iran.)

Received: 2022-12-25 Accepted : 2023-05-07 Published : 2023-11-22

Keywords: Manganese, Cobalt, electrocoagulation, chemical coagulation,

Abstract :

In this research, using the response surface method, the efficiency of the chemical coagulation and electrocoagulation processes in the treatment of Shahid Tangyuan petrochemical wastewater was modeled and optimized. The composition of Shahid Tangyuan petrochemical wastewater containing 20-60 ppm of cobalt and manganese was used in this experiment. By employing Design Expert software, an excellent agreement was obtained between the model and experimental observations in the removal efficiency of cobalt and manganese. By using the chemical coagulation method at a temperature of 25 °C, a mixing speed of 120 rpm and time of 90 minutes, pH equal to 6, and initial concentration of 20 ppm for cobalt and manganese, the best removal efficiency of cobalt and manganese was 59.8 and 57.2%, respectively. The optimal parameters in the electrocoagulation process to remove cobalt and manganese were 46 minutes of equilibrium time, pH equal to 6, and voltage of 25.8 volts. The removal efficiency was 98.3% for cobalt and 96.4% for manganese by combined chemical coagulation and electrocoagulation processes.

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