Pretreatment of Tannery Wastewater by Micro-Electrolysis and Fenton Oxidation Process

The effect of various reaction conditions and process parameters on pretreatment efficiency of tannery wastewater by micro-electrolysis and Fenton reagent was investigated,and the optimum operation parameters were obtained by batch experiments.The results indicated that under optimal condition when the reaction time for micro-electrolysis was 1 h,pH value of wastewater was 2,the ratio of Fe to C volume was 1∶1,the dosage of scrap iron was 200 g·L-1,as well as when the dosage of H2O2(30%) for Fenton oxidation process was 3 mL and the reaction time was 50 min,the removal efficiency of CODCr was raised to approximately 80% in raw wastewater.The quality of tannery wastewater has been improved dramatically by the combined technology of micro-electrolysis and Fenton reagent,which makes the wastewater more favorable for biological treatment.