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| Characterization of Cu and Zn species as well as the distribution of functional groups during composting of biogas residues and rice straw |
| YANG Ming-chao1, YU Guang-hui1,2, XU Yang-chun1, SHEN Qi-rong1 |
1. Jiangsu Key Laboratory for Organic Solid Waste Utilization, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China;
2. Institute of Surface-Earth System Science, Tianjin University, Tianjin 300072, China |
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Abstract Changes of Cu and Zn species and the distribution of functional groups during composting of pig manure biogas residue and rice straw were studied by using the community bureau of reference (BCR) extraction and synchrotron radiation based infrared spectromicroscopy (SR-FTIR). The results showed that compared to raw biogas residues, the content of Cu and Zn in the biogas residues increased 28% and 38%, respectively, after composting treatment. After composting, the exchangeable fractions decreased in both Cu and Zn, whereas their reducible fractions increased markedly. Micro-FTIR (μ-FTIR) showed a decrease of peak intensity at 3400cm-1but an increase of peak intensity at 1430cm-1during composting, suggesting the degradation of polysaccharides and the formation of aromatic substances. In summary, SR-FTIR has a potential to explore changes of organic matters and fractions of heavy metals during composting.
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Received: 19 September 2018
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