Comparison of performance the electro fenton and Fenton process in the removal of hexavalent chromium in presence of cyanide as an intermediate in aqueous

Abstract

Background and objectives: The chromium compounds could be hazardous to human's health. The aim of this study was to compare the Performance of Electro-Fenton and Fenton process in the removal of chromium in presence of cyanide as an Intermediate in aqueous. Material & Methods: In this experimental study, a reactor with 1 liter useful volume was used. Four electrodes made of iron were used in EF. Parameters of study including pH, Voltage, initial concentration of chromium, H 2 O 2 and cyanide as an intermediate in EF process and pH, concentration of Fe ions, initial concentration of chromium, H 2 O 2 and cyanide as an intermediate in F process were examined. Results: The results showed that efficiency of EF process in pH=3, Voltag = 20V in 100 mg/lit chromium, was 97%. Also in F process in optimum condition with pH=3, Fe ions = 500mg/lit, H 2 O 2 = 50ml/lit and chromium concentration = 100 mg/L efficiency was 90%. By cyanide addition reactor efficiency was decreased. Conclusion: EF process outperformed Fenton process in removal of chromium compounds.