Characterization of dissolved organic matter from biogas residue composting using spectroscopic techniques
Characterization of dissolved organic matter from biogas residue composting using spectroscopic techniques
复制标题
使用光谱技术表征沼渣堆肥中溶解的有机物
DOI：
10.1016/j.wasman.2018.06.001
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发表时间：
2018
期刊：
影响因子：
8.1
通讯作者：
ong
中科院分区：
文献类型：
--
作者：
Guo Xujing;Li Chongwei;Zhu Qili;Huang Tao;Cai Yu;Li Nanxi;Liu Jianying;Tan Xi;ong
利用光谱技术对沼渣堆肥中提取的溶解有机质（DOM）进行了表征。利用光谱参数、254处特定紫外吸光度（SUVA254）、光谱斜率比（SR）和腐殖化指数（HIX）评价DOM的结构特征。在堆肥过程中，254处的紫外吸光度随着相对抗性芳香组分的释放而增加，DOM分子量随着腐殖化程度的增加而增加。采用荧光激发-发射矩阵（EEM）光谱结合区域积分分析（FRI）和累积荧光发射（AFE）光谱结合二阶导数光谱来评价堆肥过程中DOM的演变和抗性腐殖质样物质的产生。二阶导数光谱分析表明，微生物衍生的腐殖质样物质A2在堆肥过程中容易降解。二维相关光谱(2 d-cos)结合傅里叶变换红外(FTIR)光谱确定优惠官能团的变化序列2000 - 2300 (Ctriple bondC或Cdouble bondN) → 1288厘米−1(酰胺III) atx1和2935(脂肪族组) → 1420(羧基组) → 3100 - 3400(羟基) → 1660厘米−1(芳香Cdouble bondC) atx2,表明官能团Ctriple bondC或Cdouble bondN,可以优先退化和酰胺三世,芳香族c双键dc基团难以降解。本研究表明，光谱技术是评估沼气残渣堆肥的有价值的工具。
Dissolved organic matter (DOM) extracted from composting of biogas residue was characterized using spectroscopic techniques. Spectral parameters, specific UV absorbance at 254 (SUVA254), ratios of spectral slopes (SR), and humification index (HIX) were used to assess the structural characteristics of the DOM. During composting, the UV absorbance at 254 increased as the relatively resistant aromatic fraction was released and the DOM molecular weight increased with the degree of humification. Fluorescence excitation-emission matrix (EEM) spectra with regional integration analysis (FRI) and accumulative fluorescence emission (AFE) combined with second derivative spectroscopy were used to assess the evolution of the DOM and evaluate the production of resistant humic-like substances during composting. Second derivative spectroscopy showed that microbial-derived humic-like substance A2 was easily degraded during composting. Two-dimensional correlation spectroscopy (2D-COS) combined with Fourier-transform infrared (FTIR) spectroscopy determined the preferential change sequence of the functional groups was 2000–2300 (Ctriple bondC or Cdouble bondN) → 1288 cm−1(amide III) atx1 and 2935 (aliphatic groups) → 1420 (carboxylic groups) → 3100–3400 (hydroxyl groups) → 1660 cm−1(aromatic Cdouble bondC) atx2, suggesting that functional groups of Ctriple bondC or Cdouble bondN, and amide III can be degraded preferentially, and aromatic Cdouble bondC groups were difficultly degraded. The present study showed spectroscopic techniques are valuable tools for assessing composting of biogas residues.