Key Laboratory of Groundwater Resources and Environment, Jilin University, Ministry of Education, Changchun, 130021, Jilin, PR China.
Key Laboratory of Groundwater Resources and Environment, Jilin University, Ministry of Education, Changchun, 130021, Jilin, PR China; Research Institute of Solid Waste Management, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
Chemosphere. 2021 Aug;276:130054. doi: 10.1016/j.chemosphere.2021.130054. Epub 2021 Feb 22.
Untreated livestock manure contains high concentrations of dissolved organic matter (DOM), which can enter the environment through leaching and eluviation, showing an important impact on the environment. In this research, fresh chicken manure from a large-scale chicken farm was collected as the source of DOM. The infrared spectrum of the original DOM was characterized. TOC analysis, UV spectrum and 3D fluorescence spectrum were used to measure the properties of DOM before and after photodegradation. Infrared spectroscopy results show that chicken manure DOM may contain aliphatic and aromatic compounds, alcohols, phenols, polysaccharides and some protein substances; In three systems, the order of TOC removal rates of DOM was water + UV system (85%) > > water + simulated sunlight system (7.2%) > ice + simulated sunlight system (4.5%); Changes of UV spectra, fluorescence spectra, molecular weight distribution and pH value show that, in three systems, as the illumination time increased, photodegradation reduced pH value of the systems, aromaticity and humus contents of DOM, while increased the proportion of medium and/or small molecular weight components of DOM. The amounts of all these changes were proportional to DOM photodegradation rates in the system. The binding ability of DOM with Cu and Zn in water solution decreased significantly after the photodegradation.
未经处理的牲畜粪便中含有高浓度的溶解有机物质（DOM），这些 DOM 可能会通过淋溶和沥滤进入环境，对环境产生重要影响。本研究以大型养鸡场的新鲜鸡粪为 DOM 来源，对原始 DOM 的红外光谱进行了特征描述。通过 TOC 分析、UV 光谱和 3D 荧光光谱，测量了 DOM 光降解前后的性质。红外光谱结果表明，鸡粪 DOM 可能含有脂肪族和芳香族化合物、醇类、酚类、多糖和一些蛋白质物质；在三个体系中，DOM 的 TOC 去除率顺序为水+UV 体系（85%）>水+模拟太阳光体系（7.2%）>冰+模拟太阳光体系（4.5%）；UV 光谱、荧光光谱、分子量分布和 pH 值的变化表明，在三个体系中，随着光照时间的增加，光降解降低了体系的 pH 值、DOM 的芳香度和腐殖质含量，同时增加了 DOM 中中低分子量组分的比例。所有这些变化的量与体系中 DOM 的光降解速率成正比。DOM 与水溶液中 Cu 和 Zn 的结合能力在光降解后显著降低。
