717树脂吸附渗滤液中有机物的荧光特性研究

利用同步荧光光谱和三维荧光光谱技术分析了717树脂处理卫生填埋场渗滤液过程中有机质的组成变化。同步荧光光谱显示,在开始10 min内,波长较长的特征荧光峰强度急剧下降,波长较短的荧光峰升高,其后变化不大。三维荧光光谱扫描发现,渗滤液中只有两个类富里酸荧光峰,随时间的增长,荧光峰强度下降,紫外和可见类富里酸荧光强度比值降低,发射波长明显蓝移。结果表明,717树脂对渗滤液中有机物的吸附速度快,主要吸附分子量较大、复杂程度较高的有机物,这可能有利于后续的生物处理。

Fluorescence characterization of leachate organic matter in 717 resin adsorption process

Synchronous fluorescence spectroscopy and 3-dimensional excitation emission matrices spectra (3DEEM) were used to study the composition variation of dissolved organic matter (DOM) in landfill leachate in the adsorption process with 717 resin. The synchronous fluorescence spectra showed fluorescence intensities of longer wavelength went down greatly while those of shorter wavelength went up in the first 10 min, then there were little changes. 3DEEM results indicated that there were two fulvic-like fluorescence peaks, whose intensities decreased dramatically, the peak intensities ratio (I(UV)/I(Vis)) also decreased, and the blue shifts of emission wavelengths took place obviously with the time rising. It was indicated that the adsorption rate of DOM by 717 resin was fast, and the main adsorbed DOM had higher molecular weight and higher degree of complexity, which was potential to facilitate subsequent bio-treatment.