采集垃圾渗滤液四个不同处理阶段水样, 提取制备水溶性有机物(DOM), 采用荧光光谱、 紫外光谱及红外光谱, 研究了不同阶段渗滤液DOM含量与结构特征。 结果显示, 整个处理过程渗滤液DOM浓度降低了377.6 mg·L-1, 总去除率为78.34%, 厌氧处理氧化沟和MBR过程分别去除了不同处理阶段出水中的水溶性有机物碳(DOC); 厌氧处理增加了渗滤液DOM中不饱和化合物和多糖类物质含量, 提高了渗滤液的可生化性; 氧化沟处理有效降解了不饱和化合物和糖类。 调节池和和厌氧处理过程DOM出现了类蛋白荧光峰和类腐殖质荧光峰, 而氧化沟和MBR出水只有类腐殖质荧光峰, 类蛋白物质和类富里酸物质主要在厌氧区和氧化沟中去除, 而类胡敏酸物质主要在MBR过程中去除。

In order to investigate remove characteristics of dissolved organic matter in landfill leachate, leachates were sampled during the process (i.e., adjusting tank, anaerobic zone, oxidation ditch and MBR processing). Dissolved organic matter was extracted and its content and structure were characterized by fluorescence excitation-emission matrix spectra, UV-Vis specrtra and FTIR spectra. The results showed that an amount of 377.6 mg·L-1 dissolved organic carbon (DOC) was removed during the whole treatment process, and the total removal rate was up to 78.34%. The 25.56% of DOC in the adjusting tank was removed during the anaerobic zone, 41.58% of DOC in anaerobic effluent was removed during the oxidation ditch, while 50.19% of DOC in the oxidation ditch effluent decreased in the MBR process. The anaerobic process increased the content of unsaturated compound and polysaccharides in leachate DOM, which improved the leachate biochemical characteristics. The unsaturated compound and polysaccharides were removed effectively during being in oxidation ditch. Protein-like and humic-like fluorescence peaks were observed in the adjusting tank and anaerobic zone, while humic-like fluorescence peaks were just presented in the oxidation ditch and MBR processing. Protein-like and fulvic-like substances were biodegraded in the adjusting tank and anaerobic zone, while humic-like materials were removed in the MBR process.