Spectroscopy and Spectral Analysis, Volume. 38, Issue 5, 1526(2018)
Structural Characteristics of Dissolved Organic Compounds during Swine Manure Composting
The solid-liquid interface in which the dissolved organic matter DOM exists is the most active part of chemical reaction and microbial activity. The preseenc of oxygen-containing aromatic functional groups in DOM can affect the migration and transformation of organic pollutants and heavy metals. Compost material swine manure is rich in nitrogen elements that are beneficial to microbial growth, and its DOM structure changes may be unique. 8 representative samples of different stages of DOM were extracted from swine manure compost using UV-Vis and fluorescence spectra of modern spectroscopy, combined with the basic physical and chemical indicators of swine manure composting DOM structure and organic components of evolutionary characteristics. Thedissolvedorganic carbon and total organic carbondecreased by 5888% and 1630% respectively, which indicated that the degradation rate of dissolvedorganic carbon was higher than that ofinsoluble organic carbon. The values of SUVA254, SUVA280 and E253/E203 increased, indicating that the aromatic content of DOM increased, the content of macromolecule organic matter increased, and the number of oxygen groups increased in the aromatic ring substituents. Fluorescent volume percentage of tyrosine-like substances, tryptophan-like substances and microbial metabolites decreased from 1596%, 1814% and 2545% to 553%, 1127% and 1796% respectively, while humic acid-like and fulvide-like organic were from 1767% and 2277% to 2062% and 4462% respectively. The degradation rate of protein-like substances in the organic matter components of DOM is higher than that of humus-like substances. As the composting substances are converted into humus-like substances, the contents of protein in DOM are gradually reduced, and the content of humus-like substances andthe degree of compost stabilization are increased.
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TANG Zhu-rui, XI Bei-dou, HE Xiao-song, TAN Wen-bing, ZHANG Hui, LI Dan, HUANG Cai-hong. Structural Characteristics of Dissolved Organic Compounds during Swine Manure Composting[J]. Spectroscopy and Spectral Analysis, 2018, 38(5): 1526
Received: Jun. 6, 2017
Accepted: --
Published Online: Jun. 1, 2018
The Author Email: Zhu-rui TANG (tangzhurui@live.com)