Study on Pretreatment of High Concentration and Refractory Organic Wastewater by Ferric-Carbon Micro-electrolysis and Fenton Reagent

The combined techniques of ferric-carbon microelectrolysis and Fenton reagent for treating high concentration and refractory organic wastewater were studied.Results show that when the COD in influent is 9 000 mg/L,the reaction time for the micro-electrolysis is approximately 100 min and pH is 2.2,the removal rate of COD is above 45%.When the dosage of H_2O_2(30%)is 240 mg/L and the reaction time is 50 minutes,the removal rate of COD is raised to above 75% in raw wastewater by Fenton reagent.Ferric-carbon micro-electrolysis and Fenton reagent techniques are highly efficient in removal of pollutants,stable in operation and low in cost,thus are suitable for treatment of high concentration and refractory organic wastewater.