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- W2806971640 abstract "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 (CC or CN) → 1288 cm−1 (amide III) at x1 and 2935 (aliphatic groups) → 1420 (carboxylic groups) → 3100–3400 (hydroxyl groups) → 1660 cm−1 (aromatic CC) at x2, suggesting that functional groups of CC or CN, and amide III can be degraded preferentially, and aromatic CC groups were difficultly degraded. The present study showed spectroscopic techniques are valuable tools for assessing composting of biogas residues." @default.
- W2806971640 created "2018-06-13" @default.
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- W2806971640 date "2018-08-01" @default.
- W2806971640 modified "2023-10-18" @default.
- W2806971640 title "Characterization of dissolved organic matter from biogas residue composting using spectroscopic techniques" @default.
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- W2806971640 doi "https://doi.org/10.1016/j.wasman.2018.06.001" @default.
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