Effect of clay on greenhouse gas emissions and humification during pig manure composting as supported by spectroscopic evidence

文献类型： 外文期刊

第一作者： Ren, Xiuna

作者： Ren, Xiuna;Wang, Quan;Li, Ronghua;Zhang, Zengqiang;Chang, Chein Chi;Chang, Chein Chi;Pan, Junting

作者机构：

关键词： Pig manure; Clay; Composting; Greenhouse gases; Humification; Spectrum

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN： 0048-9697

年卷期： 2020 年 737 卷

页码：

收录情况： SCI

摘要： To evaluate the effect of clay on greenhouse gas (GHGs) emissions and humification during pig manure (PM) composting, two lab-scale composting experiments, a control and a 10% clay treatment, were established. The results showed that adding clay reduced the emissions of CH4 and N2O by 45.88% and 86.79%, respectively, promoted the degradation of organic matter (OM) and facilitated the synthesis of humic acid (HA). The spectrum of dissolved organic matter (DOM) indicated that adding clay promoted the formation of aromatic carbon compounds and the degradation of aliphatic carbon. Furthermore, compared with the control, the spectral parameters including the specific UV absorbance at 254 nm (SUVA(254)), the specific UV absorbance at 280 nm (SUVA(280)) and the ration of the area at 435-480 nm and at 300-345 nm (A(4)/A(1)) of DOM were increased by 5.45% 3.66% and 29.26%, respectively. Combined with the excitation - emission matrix (EEM) and the percentage fluorescence response (Pi,n), the clay amendment promoted the decomposition of tyrosine and Tryptophan and the formation of humic-like substances, and thus increased humification. The variation in the HA/fulvic acid and the humification index confirmed these results. Therefore, clay amendment is beneficial for reducing GHG emissions, promoting humification and aromatization during pig manure composting. (C) 2020 Elsevier B.V. All rights reserved.

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