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Characteristics of Dissolved Organic Matters(DOM)in Landfill Leachates with Different Landfill Ages

【摘要】:正In this study,we investigated the characteristics of leachate DOM with different landfill ages using the chemical and spectroscopic characteristics of DOM,elemental analysis of DOM different fraction.The humic acid(HA),fulvic acid(FA)and hydrophilic(Hyl)were isolated and purified by the XAD-8 resin combined with the cation exchange resin method.The analytical results of fiuorescence EEMs revealed that the fluorescence peaks were protein-like fluouescence for young landfill leachate,while the fluorescence peaks for medium and old landfill leachates were humic-hike and fulvic-like fluorescence.Elemental analysis showed that carbon, hydrogen and nitrogen content decreased with landfill age,while oxygen content increased.Moreover,The nitrogen content in these isolated fractions followed:HA>HyI>FA.These results of elemental analysis,FTIR and fiuorescence EEMs also confirmed that aromatic carbons and portions of aliphatic functional groups were more abundant in leachate sample with increasing landfill age.The information on the characteristics of DOM in different landfill age leachate indicates important role in optimization of leachate treatment processes with respect to landfill age.

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