污泥热水解过程中有机物分子量和荧光特征变化规律

The change of spectroscopic characterization and molecular weight distribution in sludge thermal hydrolysis process

运用三维荧光光谱技术对污泥热水解过程中不同分子量范围内有机物的荧光特性进行了研究.结果表明,在原污泥和热水解污泥各分子量范围内均有4个明显的荧光峰:Peak A[Ex/Em为(240～260nm)/(379～457nm)]、Peak B[Ex/Em为(275～290nm)/(305～351nm)]、Peak C[Ex/Em为(315～340nm)/(372～445nm)]和Peak D[Ex/Em为(350～425nm)/(438～495nm)],分别为紫外区类富里酸荧光、类蛋白荧光、可见区类富里酸荧光、类腐殖酸荧光.污泥中的类富里酸荧光物质和类腐殖酸荧光物质在热水解过程中发生的主要反应是溶解液化,而类蛋白荧光物质发生的主要反应是水解反应.

Three-dimensional excitation emission matrix fluorescence spectroscopy （3DEEM） was applied to characterize the change of different molecular weight organic matter in sludge thermal hydrolysis process. Four fluorescence peaks were identified in 3DEEM of the raw sewage sludge and thermal-hydrolyzed sewage sludge： Peak A, Peak B, Peak C and Peak D, which could be attributed to the UV fulvic-like fluorophore, the protein-like fluorophore, the visible fulvic-like fluorophore and the humic-like fluorophore respectively. Results of the peak intensity in different molecular weight organic matter in raw sewage sludge and thermal-hydrolyzed sewage sludge showed that： in the thermal hydrolysis process, the main react of the fulvic-like organic matter and the humic-like organic matter was the dissolving process while the main react of the protein-like organic matter was hydrolyzing process.