| 光谱学与光谱分析 |
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| FTIR and 13C NMR Analysis of Dissolved Organic Matter (DOM) in the Treatment Process of Tannery Wastewater |
| FAN Chun-hui1, ZHANG Ying-chao2, TANG Ze-heng1, WANG Jia-hong1 |
| 1. College of Resource & Environment, Shaanxi University of Science & Technology, Xi’an 710021, China2. College of Environment, Tsinghua University, Beijing 100084, China |
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Abstract Nowadays, the wastewater quantity discharged yearly from tannery industry is around 0.2 billion t in China. The contaminants of tannery wastewater include macromolecular organic matters, such as grease, fur scraps and collagen, and the alkaline wastewater appears to be of high content of salt and COD. The quality of tannery wastewater is monitored strictly among all kinds of industry wastewater. In the treatment process of tannery wastewater, the quality of inlet and outlet water is generally analyzed. In fact, the transformation behavior of contaminants should be additionally checked to optimize the treatment conditions. Dissolved organic matter (DOM) is commonly existed in water-bodies and helpful to understand the physicochemical characteristics, while the related work should be further studied on tannery wastewater. The approaches of elemental analysis, thermal gravimetric analysis (TG), Fourier infrared spectroscopy (FTIR) and 13C nuclear magnetic resonance (13C NMR) were used to reveal the characteristics of DOM in the treatment process of tannery wastewater. The results showed: the carbon content of DOM samples increased gradually, atomic ratios of H/C increased firstly and then decreased, indicating the organic matters were decomposed into chain structures firstly, finally forming the component hard to degraded. The pyrolysis process of DOM mainly proceeded in the regions of 110～530 ℃ (aliphatic compound, protein, etc.) and 530～800 ℃ (aromatic ring, single bond of C—C, etc.). The functional groups of DOM included —OH, —NH2, CO and so on, and the aromatic substances were detected, shown from FTIR figures, in the later period of the reaction, caused by the metabolism effect of micro-organism. The content of alkoxy-C increased to the maximum in the second biochemical pond, and the minimum content of aromatic-C appeared in the second biochemical pond, suggesting the transformation behavior of carbon functional groups. The investigation on DOM in tannery wastewater is significant to understand the purification mechanism of contaminants in tannery wastewater.
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Received: 2014-04-29
Accepted: 2014-08-06
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Corresponding Authors:
FAN Chun-hui
E-mail: frank_van391@163.com
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