Performance Evaluation of Electro-Fenton Process (EFP) in Removal of Hexavalent Chromium in the Presence of Cyanide, as an Interfering Agent, from Synthetic Wastewaters

• Main Authors: Ali Reza Rahmani, Jamal Mehralipour, Amir Shabanlo, Mostafa Jahanbakhsh, Sepideh Hosseini, Elham Hosseini
• Format: Article
• Language: fas
• Published: Alborz University of Medical Sciences 2014-06-01
• Series: Muhandisī-i Bihdāsht-i Muḥīṭ
• Subjects: Electro Fenton; Chromium; Cyanide; Interfering agent; Wastewater.
• Online Access: http://jehe.abzums.ac.ir/browse.php?a_code=A-10-1-20&slc_lang=en&sid=1

Background: Chromium (VI) is a hazardous pollutant that enters into the environment through different industrial wastewater. Therefore, Choice a suitable method for removal of the pollutant before discharging into the environment is necessary. The aim of this work was performance evaluation of Electro-Fenton process (EFP) in removal of hexavalent chromium in the presence of cyanide, as an interfering agent, from synthetic wastewaters. Methods: In this experimental study, a reactor with 1 L useful volume and 4 electrodes made ​​of iron was used. pH, initial concentration of  chromium (VI), voltage, hydrogen peroxide and cyanide concentration, as an interfering agent, were investigated in order to determine the process efficiency. Results: Results reveals that the considered parameters were affected on the efficiency of the process. In optimum condition, pH=3 and voltage=20 V, initial concentration=100 mg/L, concentration of hydrogen peroxide=50 mL/L the maximum efficiency was reached up to 97%. Cyanide Presence, in the same condition, reduced the efficiency under 50 % and also, the efficiency was decreased by changing the parameters level from optimum condition. Conclusion: Results indicate the proper efficiency of chromium (VI) by EFP process; however presence of other pollutants such as cyanide can cause efficiency decrease which must be considered in the process application.