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Photodegradation of dissolved organic matter of chicken manure: property changes and effects on Zn2+/Cu2+ binding property
Chemosphere ( IF 5.778 ) Pub Date : 2021-02-22 , DOI: 10.1016/j.chemosphere.2021.130054
Shuiyuan He; Tingting Liu; Chunli Kang; Honghai Xue; Siyang Sun; Shuyi Yu

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 spectra of the original DOM were 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 values show that, in three systems, as the illumination time increased, photodegradation reduced pH values 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 Cu2+ and Zn2+ in water solution decreased significantly after the photodegradation.



中文翻译:

鸡粪中可溶性有机物的光降解:性质变化及其对Zn 2+ / Cu 2+结合性能的影响

未经处理的牲畜粪便含有高浓度的溶解有机物(DOM),可通过淋洗和淋洗进入环境,对环境产生重要影响。在这项研究中,从大型养鸡场收集的新鲜鸡粪作为DOM的来源。表征了原始DOM的红外光谱。用TOC分析,UV光谱和3D荧光光谱测量光降解前后DOM的性质。红外光谱结果表明,鸡粪中的DOM可能含有脂肪族和芳香族化合物,醇类,酚类,多糖类和某些蛋白质类物质。在三个系统中,DOM的TOC去除率的顺序为:水+紫外线系统(85%)>>水+模拟阳光系统(7.2%)>冰+模拟阳光系统(4.5%);紫外光谱,荧光光谱,分子量分布和pH值的变化表明,在三个系统中,随着光照时间的增加,光降解会降低系统的pH值,DOM的芳香性和腐殖质含量,而培养基和/或或DOM的小分子量成分。所有这些变化的数量与系统中DOM光降解速率成正比。DOM与Cu的结合能力 所有这些变化的数量与系统中DOM光降解速率成正比。DOM与Cu的结合能力 所有这些变化的数量与系统中DOM光降解速率成正比。DOM与Cu的结合能力光降解后,水溶液中的2+和Zn 2+明显降低。

更新日期:2021-02-22
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