| 光谱学与光谱分析 |
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| Using UV-Vis Absorbance for Characterization of Maturity in Composting Process with Different Materials |
| ZHAO Yue1, WEI Yu-quan1, LI Yang1, XI Bei-dou2, WEI Zi-min1*, WANG Xing-lei1, ZHAO Zhi-nan1, DING Jei1 |
1. College of Life Science, Northeast Agricultural University, Harbin 150030, China
2. Laboratory of Water Environmental System Engineering, Chinese Research Academy of Environmental Science, Beijing 100012, China |
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Abstract The present study was conducted to assess the degree of humification in DOM during composting using different raw materials, and their effect on maturity of compost based on UV-Vis spectra measurements and chemometrics method. The raw materials of composting studied included chicken manure, pig manure, kitchen waste, lawn waste, fruits and vegetables waste, straw waste, green waste, sludge, and municipal solid waste. During composting, the parameters of UV-Vis spectra of DOM, including SUVA254, SUVA280, E250/E365, E4/E6, E2/E4, E2/E6, E253/E203, E253/E220, A226～400, S275～295 and S350～400 were calculated, Statistical analysis indicated that all the parameter were significantly changed during composting. SUVA254 and SUVA280 of DOM were continuously increased, E250/E365 and E4/E6 were continuously decreased in DOM, while A226～400, S275～295 and S350～400 of DOM at the final stage were significantly different with those at other stages of composting. Correlation analysis indicated that the parameters were significantly correlated with each other except for E2/E4 and E235/E203. Furthermore, principal component analysis suggested that A226～400, SUVA254, S350～400, SUVA280 and S275～295 were reasonable parameters for assessing the compost maturity. To distinguish maturity degree among different composts, hierarchical cluster analysis, an integrated tool utilizing multiple UV-Vis parameters, was performed based on the data (A226～400, SUVA254, S350～400, SUVA280 and S275～295) of DOM derived from the final stage of composting. Composts from different sources were clustered into 2 groups. The first group included chicken manure, pig manure, lawn waste, fruits and vegetables waste, green waste, sludge, and municipal solid waste characterized by a lower maturity degree, and the second group contained straw waste and kitchen waste associated with a higher maturity degree. The above results suggest that a multi-index of UV-Vis spectra could accurately evaluate the compost maturity, and A226～400, SUVA254, S350～400, SUVA280 and S275～295 of DOM could serve as primary parameters when the compost maturity was assessed using UV-Vis spectra.
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Received: 2014-04-22
Accepted: 2014-07-29
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Corresponding Authors:
WEI Zi-min
E-mail: weizm691120@163.com
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