The efficiency of combined process of electrocoagulation with iron electrodes and a filter columns containing pumice in removing chromium and cyanide from the wastewater of Safa Dasht industrial estate

Subject Areas : Environment Pullotion (water and wastewater)

Seyed mohsen Beladi ¹ ( Associate Professor, Department of Master of Environmental Civil Engineering, Department of Environment, Faculty of Art and Architecture, Islamic Azad University, Tehran West Branch. )
roya mafigholami ² ( Associate Professor, Department of Environment, Faculty of Art and Architecture, Islamic Azad University, Tehran West Branch. *(Corresponding Author) )
mehrad m,ehrdadian ³ ( Master of Environmental Civil Engineering, Department of Environment, Faculty of Art and Architecture, Islamic Azad University, Tehran West Branch. )

Received: 2023-02-27 Accepted : 2023-04-22 Published : 2023-09-23

Keywords: Pumice, Electrocoagulation process, filtration, industrial town wastewater,

Abstract :

Background and Objectives: Nowadays, environmental preservation is considered a necessary matter for society. Industrial wastewater treatment requires various effective processes, due to their unique physicochemical characteristics. The quality and quantity of industrial wastewater are more complicated than human wastewater due to the presence of various industries and must be treated before being discharged into the environment due to their high pollution load. One of the common pollutants in industrial wastewater is heavy metals. The electrocoagulation and filtration process, as an environmentally friendly and integrated process, have a high capability in treating wastewater with high levels of pollution. Material and Methodology: In this study, the electrocoagulation process was used on a laboratory scale to remove chromium (hexavalent) and cyanide metal pollutants. In this process, the effect of various parameters, including the initial pH of the wastewater (5-9), reaction time (0-60 minutes), applied electric current (1-3 Amps), and filtration bed height (10-30 cm) were investigated. Findings: Based on the obtained results, the best conditions for the electrocoagulation process include a pH of 7, a reaction time of 60 minutes, an applied electric current of 3 Amps, and a filter bed height of 30 cm. Under these optimal conditions, the removal efficiency of chromium and cyanide was 92% and 88%, respectively. In this way, in the determined optimal conditions, the concentration of chromium and cyanide decreased from 13 and 0.908 mg/L to 1.56 and 0.72 mg/L, respectively. Discussion and Conclusion: Based on the standards provided by Iran's Environmental Protection Organization, treated wastewater has the ability to be discharged into the environment.

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