Oxidation Treatment of Tannery Wastewater by Fenton-like Reagent+Catalyst A

With the secondary sedimentation tank effluent from the leather factory in Henan province as the object,the effect of Fenton-like reagent oxidation cooperated with catalyst A on the tannery wastewater treatment and the influence factors thereof were studied.The effect factors on COD removal rate of tannery wastewater were discussed by investigating the influence of different operation parameter such as the dosage ratio of H2O2 to Fe2+,the reaction time,the dosage of PAM and the aeration time.The experimental results show that the optimal molar ratio of 2.5%H2O2 to10%FeSO4·7H2O was 1∶1,and the optimal dosing quantity was 9.6 mL and 22.0 mL respectively.The optimal dosage of 0.6%PAM was 0.8 mL,the reaction time was 1.5 h,and the aeration time was 10 mins.Under the above condition,the COD of the effluent decreased 80 mg·L-1,which met the specification for grade 1 of tannery wastewater discharge in integrated wastewater discharge standard(GB8978-1996).