垃圾渗滤液水溶性有机物荧光谱特性研究  

Study on Fluorescence Characteristic of Dissolved Organic Matter from Municipal Solid Waste Landfill Leachate

作　　者：席北斗[1] 魏自民[1,2] 赵越[2] 李鸣晓[2] 刘鸿亮[1] 姜永海[1] 何小松[2] 杨天学[2] 

机构地区：[1]中国环境科学研究院城市系统工程研究室,北京100012 [2]东北农业大学生命科学院,黑龙江哈尔滨150030

出　　处：《光谱学与光谱分析》2008年第11期2605-2608,共4页Spectroscopy and Spectral Analysis

基　　金：国家重点基础研究发展计划“973”项目(2005CB724203);国家科技支撑计划课题项目(2006BAC06B04);哈尔滨市基金项目(2005AFXXJ043)资助

摘　　要：选取不同填埋年限的垃圾渗滤液样品,利用荧光检测技术,分析了渗滤液水溶性有机物(DOM)组成变化。DOM荧光同步扫描光谱表明,在填埋的0～5年,结构简单的化合物在较短波长(335,385 nm)的特征峰荧光强度急剧降低,而在5～10年的降低幅度较小。DOM三维荧光光谱显示,填埋0年,垃圾渗滤液DOM产生2个类蛋白荧光峰(Ex/Em=270 nm/355.5 nm和Ex/Em=220 nm/350 nm);而填埋5年后,类蛋白荧光峰消失,形成2个分子结构复杂的类富里酸荧光峰(Ex/Em=330 nm/412.5 nm和Ex/Em=250nm/416.5 nm),表明DOM分子中简单化合物减少,缩合度高的化合物增加。而后随着填埋时间的推移,DOM成分相对稳定,以富里酸类物质为主,但其数量及芳构化程度则呈增加的趋势。以上结果证实,随着填埋年限的增加,DOM分子呈复杂化趋势。In the present study,the samples of leachate of 0,5,10-years-old landfill were respectively taken from landfill plant,the dissolved organic matter（DOM） was extracted from landfill leachate,and the fluorescence spectra of DOM were determined.The fluorescence synchronous scan spectra of DOM in 0-year-old leachate exhibited a primary peak at 335 nm,a secondary peak at 455 nm,and a shoulder peak at 385 nm.While the fluorescence intensities of DOM at different peaks were decreased for 5-year-old leachate,especially those of the peaks at shorter wavelengths（335 and 385 nm） which may be ascribed that the simpler structural components were decreased sharply.Compared with 5-year-old leachate,the fluorescence intensity of DOM in 10-year-old leachate decreased slightly.Three-dimensional excitation emission matrix fluorescence spectra（3DEEM） of DOM in 0-year-old leachate exhibited two peaks at Ex/Em wavelength pairs of 270/355 and 220/350,respectively,which were all associated with protein-derived compounds,while the peaks of protein-like disappeared in 5-year-old leachate,and new peaks of complex structural fulvic acid-like were formed at Ex/Em wavelength pair of 330/412.5 and 250/416.5,respectively.This indicated the component of DOM in the leachate of 5-year-old landfill led to a decrease in low molecular compound,and an increase in high molecular compound compared to that of the 0-year-old.3DEEM of DOM of 10-year-old leachate was similar to that of DOM in the 5-year-old,but the fluorescence intensity of the peaks of fulvic acid-like in DOM was different,and compared with that of 5-year-old leachate,the peak of DOM in 10-year-old leachate shifted from Ex/Em wavelength pair of 250/416.5 to 250/427.5.This indicated that the DOM formed similar structures,but the structure of fulvic acid-like in DOM of 10-year-old leachate had a greater degree of aromatization and quantity than that of 5-year-old leachate.The results obtained from fluorescence synchronous scan spectroscopy and 3DEEM indicate that aromatic structur

关 键 词：填埋渗滤液 水溶性有机物 荧光光谱 

分 类 号：X705[环境科学与工程—环境工程]