Advanced treatment of effluent of biochemical treated tannery wastewater by Fenton reagent

With biochemical effluent from the wastewater treatment plant of a factory whose main business was rawhide processing as the object,the effect of Fenton reagent on that kind of wastewater treatment and the influence factors thereof were studied.The test determined the optimal condition for the degradation of the said biochemical effluent: the pH value was 5.0,the dosage of H2O2 was 600 mg/L,the mass concentration of Fe2+ was 500 mg/L,the reaction time was 50 min.Under the above condition,when the mass concentration of influent COD was 333 mg/L,the chroma was 90 times,the removal rate of COD and chroma reached 73.3% and 98% respectively,the mass con-centration of COD of the wastewater decreased to 89 mg/L,the chroma was lower than 5 times,which met the speci-fication for grade 1 of tannery wastewater discharge in intergrated wastewater discharge standard(GB 8978-1996).