Study on Ozone/Fenton Reagent Co-processing of Wheat Straw Pulp Hypochlorite Bleaching Wastewater

This experiment explores to pre ozone used for wheat straw pulp hypochlorite bleaching wastewater treatment of optimum oxidation time, initial pH of Fenton reaction water, H2O2/FeSO4 dosing ratio, reaction time on Fenton method depth treatment effect of bleaching effluent. The bleaching wastewater is pretreated with the ozone concentration 2.9mg/l. The experimental results show that the best pretreatment time of ozone is 30min. The removal rates of CODcr, TOCcr and chroma were 53.9%, 82.8% and 68% respectively with ozone pretreatment. The ozone oxidation process has a good effect on the removal of organic substances in wastewater. Treatment of straw pulp hypochlorite bleaching wastewater by Fenton reagent, the experimental results show that CODcr removal rate of wastewater is about 74%, the chroma is above 87.5%, and the supernatant is colorless under the initial ph5.6, H2O2 of 1ml, n (H2O2): n (Fe2+)=4, FeSO4 dosage 2ml, reaction temperature 20 degrees C, reaction time 40min, 0.1% PAM.