Study on the Advanced Treatment of Pulp and Paper Wastewater by Fenton Oxidation and its Comparison with Ozone Oxidation

The treatment on the secondary biochemical effluent of pulp and paper wastewater by Fenton oxidation was studied and the influence of H2O2dosage, Fe2+dosage, pH and reaction time on the treatment effect was investigated by the orthogonal test and single-factor test. The treatment effect was eminent when the H2O2dosage was 3.75mmol/L, Fe2+dosage was 3.20mmol/L, pH was 4.00 and the reaction time was 80.00min. The removal rate of UV254and chromaticity significantly increased as H2O2dosage was 1.88 ~ 3.75mmol /L, but the COD removal rate declined as H2O2dosage was more than 2.81mmol/L; each removal rate increased and then decreased slightly with the increase of Fe2+dosage, each removal rate dropped obviously as pH was more than 5.00; within 80.00min, the removal rate increased significantly, it changed little with the continuous increase of reaction time. Under the optimal conditions, the COD removal with Fenton oxidation was more effective and its removal rate could achieve 88.33%, it was advantageous compared with ozone oxidation; but the elimination effect of UV254and chromaticity to pulp and paper wastewater with ozone oxidation was better, the two removal rate achieved 83.70% and 92.00% in a short time, respectively. Although it could reach such a removal effect by Fenton oxidation, it did not have the superiority in reaction time.