考查反渗透(RO)膜处理渗滤液前所采用的预处理工艺对致膜有机污染物的去除效果, 为RO膜预处理工艺的选择提供参考, 采用同步荧光光谱、 三维荧光光谱、 紫外-可见全光谱对某垃圾焚烧厂渗滤液原液及其经“生化(UASB+A/O)+超滤”预处理工艺各级出水进行不同分子量分布区间的分析。 同步荧光光谱表明, 预处理工艺总体能有效去除波长在250～320 nm各分子量区间的以及波长>320 nm、 分子量>1KDa的DOM; 三维荧光光谱表明, 预处理工艺总体能有效去除低激发波长类酪氨酸、 低激发波长类色氨酸及高激发波长类色氨酸及分子量>1KDa的类富里酸和高激发波长类酪氨酸; 紫外-可见全光谱表明, 预处理工艺总体能有效去除分子量>1KDa带π-π*跃迁的DOM和各分子量区间的带多个共轭体系苯环结构的DOM。 结果显示, 将“生化(UASB+A/O)+超滤”组合工艺作为RO膜法处理焚烧厂渗滤液的预处理工艺时, 还需加强同步荧光范围>320 nm、 分子量<1 KDa、 带π-π*跃迁的类富里酸及高激发波长类酪氨酸的去除。

In order to examine the removal of organic matter in the leachate which results in reverse osmosis (RO) membrane fouling, and to provides a reference to select appropriate pretreatment processes of RO, synchronous-scan fluorescence, three-dimensional excitation emission matrix fluorescence spectroscopic and UV-Vis spectrum of the dissolved organic matter (DOM) in different molecular weight range in effluent from each leachate process of “biochemical (UASB+A/O)and UF” pretreatment in some incineration plant were examined. The results of synchronous fluorescence spectra analysis showed that DOM in the wavelength range of 250～320 nm with all the molecular weight and in the wavelength>320 nm with molecular weight>1 KDa was removed obviously by the pretreatment processes. The results of three-dimensional excitation-emission matrix (3D-EEM) fluorescence spectra showed that the pretreatment processes removed low-excitation wavelength tyrosine-like, low-excitation wavelength tryptophan-like and high-excitation wavelength tryptophan-like with all the molecular weight off, and fulvic-like matter and high-excitation wave length tyrosine-like with molecular weight>1 KDa effectively. The results of UV-Vis spectra analysis showed that the pretreatment processes removed DOM of molecular weight>1 KDa with π-π* transition and DOM of all molecular weight with conjugated system of the benzene ring structure. It was concluded that the removal of both fulvic-like matter and high-excitation wave length tyrosine-like with the wavelength>320 nm, molecular weight<1 KDa and with π-π* transition should be strengthened for controlling (RO) membrane fouling, when leachate was treated by RO with the pretreatment processes of “biochemical(UASB+A/O)and UF”.