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Wastewater after chemical flooding is difficult to be treated by biological methods due to the residual chemicals in the wastewater.Fenton oxidation,which has been widely applied to detoxifying hazardous organic compounds and improving the biodegradability of these compounds,can solve this problem.So,in this paper,Fenton oxidation was used to enhance the biodegradability of the wastewater after chemical flooding.The optimum operating conditions for the Fenton oxidation process were 2.5 g/L Fe2+,600 mg/L H2O2and 30 min of treatment time.The wastewater pretreated by Fenton oxidation was treated by aerobic activated sludge.It was found that a small amount of H2O2can significantly increase both the biodegradation rate and extent of the wastewater.The effluent CODCrand HPAM contents were 260 and 94 mg/L respectively after the aerobic biological process with the biodegradation time of 24 h.After Fenton oxidation combining with biodegradation,the total CODCrremoval efficiency was up to 90%,and polymer and oil degrading efficiencies were 95%and 92%respectively.
Wastewater after chemical flooding is difficult to be treated by biological methods due to the residual chemicals in the wastewater. Fenton oxidation, which has been widely applied to detoxifying hazardous organic compounds and improving the biodegradability of these compounds, can solve this problem. O, in this paper, Fenton oxidation was used to enhance the biodegradability of the wastewater after chemical flooding. optimum conditions for the Fenton oxidation process were 2.5 g / L Fe2 +, 600 mg / L H2O2 and 30 min of treatment time. The wastewater pretreated by Fenton oxidation was treated by aerobic activated sludge. It was found that a small amount of H2O2can significantly increase both biodegradation rate and extent of the wastewater. effluent CODCrand HPAM contents were 260 and 94 mg / L respectively after the aerobic biological process with the biodegradation time of 24 h. After Fenton oxidation combining with biodegradation, the total CODCrremoval efficiency was up to 90%, an d polymer and oil degrading efficiencies were 95% and 92% respectively.