Compositional and functional features of humic acid-like fractions from vermicomposting of sewage sludge and cow dung
Compositional and functional features of humic acid-like fractions from vermicomposting of sewage sludge and cow dung
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DOI：
10.1016/j.jhazmat.2010.09.081
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发表时间：
2011-01-30
影响因子：
13.6
通讯作者：
Huang, Zhidong
中科院分区：
文献类型：
--
作者：
Li, Xiaowei;Xing, Meiyan;Huang, Zhidong
研究了添加了不同比例牛粪的污水污泥在用臭爱胜蚓堆肥90天后在五种不同基质中发生的化学变化。使用紫外/可见光、傅里叶变换红外 (FT-IR) 和荧光光谱以及扫描电子显微镜分离其类腐殖酸 (HAL) 部分，以确定元素和功能组成以及结构和功能特征。蚯蚓堆肥后，所有基质中的总有机碳和碳氮比下降，总可提取碳和腐殖酸（HA）碳增加。在HAL馏分中，C和H含量、C/N和C/O以及脂肪族结构、蛋白质组分和碳水化合物减少，而O和N以及酸性官能团含量和C/H比、芳香性和缩聚结构增加。此外，结果表明，在污水污泥中添加牛粪可以提高基质有机质腐殖化的质量。蚯蚓堆肥中 HAL 组分的结构与土壤 HA 的典型结构相似，尤其是仅由牛粪制成的蚯蚓堆肥。扫描电子显微镜显示最终产品中 HAL 部分的微观结构变得细粒和块状。总体结果表明，蚯蚓堆肥是一种有效的技术，可促进污水污泥和牛粪中以及两种材料的混合物中有机物（OM）的腐殖化，提高其作为土壤有机物资源的质量和环境安全性，以用作土壤改良剂。 (C) 2010 爱思唯尔 BM。版权所有。
The chemical changes occurring in five different substrates of sewage sludge spiked with different proportions of cow dung after vermicomposting with Eisenia foetida for 90 days were investigated. Their humic acid-like (HAL) fractions were isolated to determine the elemental and functional composition, and structural and functional characteristics using ultraviolet/visible, Fourier transform infrared (FT-IR) and fluorescence spectroscopies and scanning electron microscopy. After vermicomposting, the total organic C and C/N ratio decreased, and the total extractable C and humic acid (HA) C increased in all substrates. In the HAL fractions, the C and H contents, C/N and C/O and aliphatic structures, proteinaceous components and carbohydrates decreased, while the O and N and acidic functional group contents and C/H ratio, aromaticity and polycondensation structures increased. Further, the results suggest that the addition of cow dung to sewage sludge could improve the quality of organic matter humification of the substrates. The structures of HAL fractions in vermicomposts resembled those typical of soil HA, especially the vermicompost of cow dung alone. Scanning electron microscopy showed the microstructure of HAL fraction in final product became close-grained and lumpy. Overall results indicate that vermicomposting was an efficient technology for promoting organic matter (OM) humification in sewage sludge and cow dung alone, as well as in mixtures of both materials, improving their quality and environmental safety as a soil OM resource for utilization as soil amendments. (C) 2010 Elsevier BM. All rights reserved.