关键词: 漂白废水, 高级氧化, 芬顿试剂, 降解机理, 可生化性

Abstract:

UV/Fenton oxidation technology was adopted to eliminate the residual pollutants and promote the biodegradability of the coagulation-anaerobic pretreated bleaching effluents,and the response surface methodology was used to optimize the operation conditions.Then,the GC/MS was employed to investigate the degradation process of organic pollutants in the bleaching effluents.The results show that,in the optimal operation conditions,namely,a pH value of 3.8,a H2O2 concentration of 30 mmol/L,a H2O2 /Fe（Ⅱ） molar ratio of 60∶ 7 and a reaction duration of 120 min,the COD removal reaches the maximum 88.2%.Moreover,it is indicated that,with the help of the hydroxyl radicals generated from Fenton reagent,aromatics,polycyclic aromatic hydrocarbons and organic chlorides with high toxicity in the effluents all degrade into organic acids with low molecular mass,and that UV/Fenton treatment greatly weakens the biological inhibition and improves the biodegradability index of the effluents.

Key words: bleaching effluents, advanced oxidation processes, Fenton’s reagent, mechanism of degradation, biodegradability