芬顿和双氧水紫外处理稳定渗滤液的光谱特征

为研究芬顿(Fenton)法和双氧水紫外(H_2O_2-UV)法处理稳定(填埋场)渗滤液过程中不同类别有机物的去除规律,采用三维荧光光谱(3D-EEM)和254nm波长紫外吸光度(SUVA254),结合荧光区域一体化(FRI)EEM数据处理方法,分析总有机物去除水平相近条件下,两种处理方法去除不同有机物水平和组分变化的特征.结果表明:两种处理方法中,均是蛋白质类物质比腐殖质类物质优先被去除,酪氨酸类物质比色氨酸类物质优先被去除;较高的总有机碳(TOC)去除率段比低去除率段能去除更大比例的最难降解腐殖质类物质.在相近的TOC去除水平下,H_2O_2-UV法比Fenton法对腐殖质类物质的去除更有效,且能更多地去除胡敏酸类物质;Fenton法处理中,Fe2+投加量的增加能更多地通过絮凝沉淀作用去除胡敏酸类物质.Fenton和H_2O_2-UV作为预处理方法应用时,为了既能达到较好处理效果又能节约成本,应选择对腐殖质类物质去除率更高的H_2O_2-UV技术作为预处理方法.

Spectroscopic Characteristics of Mature Leachate During Fenton and H2O2 UV Treatment Process

In order to determine the removal rule of different organic matters during mature landfill leachate Fenton treatment and H2O2 UV treatment, the three dimensional fluorescence excitation emission matrix (3D EEM) spectroscopy and specific ultraviolet light absorbance at 254 nm (SUVA254) combined with fluorescence regional integration (FRI) EEM data processing method were applied to analyze component evolution characteristics of different organic matters. The results show that both protein like compounds rather than humic like substances, tyrosine like compounds rather than tryptophan like compounds are preferentially removed by these two treatment. A greater proportion of the most difficult degradative humic like substances is removed when TOC removal efficiency is higher. Under similar TOC removal efficiency, the H2O2 UV method is more effective to eliminate humic like substances than the Fenton method, and can eliminate more humic acid like compounds. In Fenton treatment, more humic acid like compounds can be precipitated with an increasing dosage of Fe2+. The H2O2 UV method should be chosen as the pretreatment method because of its higher humic like substances removal efficiency in order that not only a better treatment result can be achieved, but also more cost can be saved.