微山湖(下级湖)中溶解性有机质(DOM)的降解实验研究

Research on the Degradation of Dissolved Organic Matter in Half of the Weishan Lake

利用微山湖原状水样,模拟光降解和微生物降解两种方式作用下,探讨溶解性有机质(DOM)的降解过程和不同的降解特性。结果显示,DOM的去除率和氨氮的浓度以及活性磷酸盐(SRP)的浓度存在显著正相关关系;同时利用三维荧光光谱研究了微山湖水体中的DOM的荧光光谱特性,微山湖水体DOM的三维荧光光谱图中出现了4个明显的荧光峰,分别为:类蛋白(B)、(D)峰,紫外富里酸(A)峰及可见光富里酸(C)峰。通过设置不同的光照条件(紫外光照、可见光照、避光)研究DOM降解过程,对比发现,紫外光照降解DOM最为彻底,其次为避光条件,最后为可见光条件;而就各种组分来看,类蛋白物质较容易被降解,尤其是芳环氨基酸结构的蛋白类物质最容易被降解,而大分子的富里酸物质较难被降解。

Using the undisturbed water samples in Weishan Lake to conduct simulation experiments,to investigate the degradation process of DOM in light degradation and microbial degradation conditions. The results shows,the removal of DOM have a significant positive correlation with concentration of ammonia and SRP. Simultaneously,we used three-dimensional fluorescence spectroscopy to research the fluorescence spectra of DOM in the water. The three-dimensional fluorescence spectra appear four obvious fluorescence peaks. Peaks B and D were the protein peaks; Peaks A and C were referred to as fulvic-like fluorescence. By setting different lighting conditions,we explore the degradation process of DOM. The degree of DOM degradation were： UV UL DK; From the point of view of various components,protein substance to be degraded more easily,In particular,the aromatic ring is a protein amino acid structure substances most likely to be degraded; The fulvic acid macromolecule material more difficult to be degraded.