Abstract In this study, the dissolved organic matter (DOM) derived from the compost of pig manure (PM) with the addition of biochar (B) and bean dregs (BD) was researched its composition and structure. No additives, 10%B, 15%BD and 15%BD + 10%B were mixed with raw materials for composting, which are defined as CK, B, BD and BD + B treatments, respectively. The spectroscopic characteristics of DOM were evaluated via various spectroscopy methods including fluorescence spectroscopy, Fourier transform infrared (FTIR) and UV–visible. The ratio of 1650 cm−1/1030 cm−1 and 1650 cm−1/2920 cm−1 in the FTIR spectra increased by 4.26–47.87% and 0.58–37.79% in the treatment with additives, respectively, and BD + B yielded the highest percent increase compared to the CK. Furthermore, the BD + B treatment increased the value of SUVA254 and SUVA280 by 23.11–63.08% and 21.13–56.36%, while declining the E250/E365 ratio by 0.54–6.17% compared to other treatments. Furthermore, the largest increased Pi,n in the fluorescence spectroscopy of excitation emission matrix (EEM) was observed in the BD + B treatment. Overall, the combined amendments of BD and biochar were more beneficial in enhancing the humification and aromatization of DOM during the composting.

中文翻译：

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豆渣和生物炭改良猪粪堆肥过程中溶解有机物的光谱特征

摘要 本研究对猪粪（PM）堆肥中添加生物炭（B）和豆渣（BD）产生的溶解有机质（DOM）的组成和结构进行了研究。无添加剂，10%B、15%BD和15%BD+10%B与原料混合进行堆肥，分别定义为CK、B、BD和BD+B处理。DOM 的光谱特性通过各种光谱方法进行评估，包括荧光光谱、傅里叶变换红外 (FTIR) 和紫外可见光。FTIR 光谱中 1650 cm-1/1030 cm-1 和 1650 cm-1/2920 cm-1 的比值在添加添加剂后分别增加了 4.26-47.87% 和 0.58-37.79%，BD + B与 CK 相比，增幅最高。此外，BD + B 处理使 SUVA254 和 SUVA280 的值增加了 23.11-63。08% 和 21.13–56.36%，同时与其他处理相比，E250/E365 比率下降了 0.54–6.17%。此外，在 BD + B 处理中观察到激发发射矩阵 (EEM) 的荧光光谱中 Pi,n 的最大增加。总体而言，BD 和 biochar 的组合修正更有利于提高堆肥过程中 DOM 的腐殖化和芳香化。