堆肥过程不同分子量水溶性有机物电子转移能力的演变及影响因素
发布时间：2018-10-29 15:20
【摘要】：利用超滤技术、电化学方法和光谱技术,以堆肥水溶性有机物的不同分子量(MW)组分为研究对象,分析在堆肥过程中不同分子量水溶性有机物(DOM)的组成特征、结构演变和电子转移能力变化的影响因素。结果表明,类蛋白物质主要存在于堆肥前期的DOM(MW1 kDa)中,随着堆肥的进行,类蛋白物质不断降解,类富里酸物质持续合成,堆肥后期类蛋白物质被完全降解,类富里酸物质成为DOM(MW1 kDa)主要的荧光组分。类腐殖物质是DOM(MW=1~3 kDa)、DOM(MW=3~5 kDa)和DOM(MW5 kDa)的主要荧光组分,堆肥过程中类腐殖质物质在3种不同分子量组分的变化各不相同,但是堆肥后期类腐殖质物质在3个不同分子量组分的含量均高于堆肥初期。堆肥过程中DOM(MW1 kDa)的电子供给能力(EDC)呈降低趋势,而电子接受能力(EAC)呈升高趋势;DOM(MW5 kDa)的EDC在堆肥过程中呈上升趋势,而EAC则无明显的变化规律。DOM(MW=1~3 kDa)和DOM(MW=3~5 kDa)的EDC和EAC在整个堆肥过程无明显变化规律。不同分子量组分堆肥DOM的EAC受控于堆肥过程木质素降解产物的含量,而其EDC变化与荧光参数和紫外参数无明显关系。
[Abstract]:The composition characteristics of water-soluble organic compounds (DOM) with different molecular weights in compost were analyzed by ultrafiltration, electrochemical and spectral techniques. The influence factors of structural evolution and electron transfer ability change. The results showed that the protein-like substances mainly existed in DOM (MW1 kDa) in the early stage of composting. With the composting, the protein-like substances were continuously degraded, the fulvic acid-like substances were synthesized continuously, and the protein-like substances were completely degraded in the late composting period. Fulvic acid is the main fluorescent component of DOM (MW1 kDa). Humic substances are the main fluorescent components of DOM (MW=1~3 kDa), DOM (MW=3~5 kDa) and DOM (MW5 kDa). However, the content of humus-like substances in the later composting period was higher than that in the early composting period. During composting, the electron supply capacity of DOM (MW1 kDa) showed a decreasing trend, (EDC) showed a decreasing trend, while the electronic receptivity (EAC) showed an increasing trend. EDC of DOM (MW5 kDa) showed an upward trend during composting, but EAC had no obvious change rule. EDC and EAC of DOM (MW=3~5 kDa) and. DOM (MW=1~3 kDa (MW=3~5 kDa) did not change in the whole composting process. The EAC of composting DOM with different molecular weight was controlled by the content of lignin degradation product in composting process, but the EDC change had no obvious relation with fluorescence parameter and ultraviolet parameter.
【作者单位】： 兰州交通大学环境与市政工程学院;中国环境科学研究院环境基准与风险评估国家重点实验室;中国环境科学研究院国家环境保护地下水污染模拟与控制重点实验室;
【基金】：国家杰出青年基金(No.51325804) 国家自然科学基金(No.51508540)资助~~
【分类号】：S141.4
[Abstract]:The composition characteristics of water-soluble organic compounds (DOM) with different molecular weights in compost were analyzed by ultrafiltration, electrochemical and spectral techniques. The influence factors of structural evolution and electron transfer ability change. The results showed that the protein-like substances mainly existed in DOM (MW1 kDa) in the early stage of composting. With the composting, the protein-like substances were continuously degraded, the fulvic acid-like substances were synthesized continuously, and the protein-like substances were completely degraded in the late composting period. Fulvic acid is the main fluorescent component of DOM (MW1 kDa). Humic substances are the main fluorescent components of DOM (MW=1~3 kDa), DOM (MW=3~5 kDa) and DOM (MW5 kDa). However, the content of humus-like substances in the later composting period was higher than that in the early composting period. During composting, the electron supply capacity of DOM (MW1 kDa) showed a decreasing trend, (EDC) showed a decreasing trend, while the electronic receptivity (EAC) showed an increasing trend. EDC of DOM (MW5 kDa) showed an upward trend during composting, but EAC had no obvious change rule. EDC and EAC of DOM (MW=3~5 kDa) and. DOM (MW=1~3 kDa (MW=3~5 kDa) did not change in the whole composting process. The EAC of composting DOM with different molecular weight was controlled by the content of lignin degradation product in composting process, but the EDC change had no obvious relation with fluorescence parameter and ultraviolet parameter.
【作者单位】： 兰州交通大学环境与市政工程学院;中国环境科学研究院环境基准与风险评估国家重点实验室;中国环境科学研究院国家环境保护地下水污染模拟与控制重点实验室;
【基金】：国家杰出青年基金(No.51325804) 国家自然科学基金(No.51508540)资助~~
【分类号】：S141.4
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