Treatment of azo dyes wastewater by Fenton reagent technique

In order to assess the feasibility of treating the high concentration azo dyes wastewater by Fenton′s reagent,the azo dyes wastewater after nanofiltration from some factory in Tianjin is treated by Fenton′s reagent.The effects of pH value,dosage of H2O2 and Fe2+,reaction time,adding ways of H2O2 on the removal efficiency of CODCr are investigated.The results show that under the optimal condition that the dosage of H2O2(30%) is 12.5 mL/L,the pH value is about 3,the mol ratio between Fe2+ and H2O2 is l∶10,reaction time is 6 h,adding ways of H2O2 is the process of batch feed,the removal rate of CODCr reaches 81.3%,the treatment effect is perfect.