Electro-Fenton process for water and wastewater treatment

Electro-Fenton process is an emerging treatment technology for water and wastewater treatment. Electro-Fenton utilizes hydroxyl radicals to oxidize hazardous contaminants and is especially useful to treat recalcitrant compounds that are not easily degraded in conventional water and wastewater treatment plants. This paper reviews the mechanism of electro-Fenton process and its kinetic modeling. The effects of electrode materials, hydrogen peroxide concentration, ferrous ion concentration, pH, electrolyte, oxygen sparging rate, temperature, initial concentration of pollutant, feeding mode, current density, and distance between electrodes are also reviewed. The performance of electro-Fenton is compared with other treatment technologies. Finally, existing challenges and future perspectives are discussed.