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| The distribution of DOM in aeration pretreatment improved soil infiltration system based on FRI and PARAFAC |
| LÜ Jing-jing1,2, GONG Wei-jin1, DOU Yan-yan1, DUAN Xue-jun1, LIU Hai-fang1, ZHANG Lie-yu3, XI Bei-dou3, YU Shui-li2, HOU Li-an2,4 |
1. Zhongyuan University of Technology, Zhengzhou 450007, China;
2. College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;
3. Chinese Research Academy of Environmental Science, Beijing 100012, China;
4. Rocket Army Logistics Science and Technology Institute, Beijing 100190, China |
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Abstract It was studied direct distribution characteristics of dissolved organic matter (DOM) in the treatment of domestic sewage by aeration pretreatment of improved soil infiltration system using three-dimensional fluorescence spectroscopy (3D-EEMs) based on parallel factor analysis (PARAFAC) and fluorescence regional integration (FRI), combined with principal component analysis, correlation analysis, cluster analysis and multivariate linear regression analysis. According to FRI, DOM in soil infiltration system could be divided into five fluorescent regions, including three protein-like regions (I, Ⅱ, IV) and two humus-like regions (Ⅲ, V). Along the vertical direction downward, DOM dissolution in soil infiltration system leaded to a significant negative correlation between TOT and TN, TP, NH4+-N, COD, TOC and a significant positive correlation with EC, in which fluorescence region V had a significant positive correlation with NO3--N concentration and nitrogen removal. It was closely related to the composition of DOM. Four fluorescent components could be extracted from DOM species by PARAFAC, namely C1type fulvic acid and C2, C3, C4 type protein. Fmax showed that the degradation order of soil infiltration system was C2 > C4 > C1, C3. It meant that tyrosine was the most easily degraded, followed by tryptophan-like substances and fulvic acid-like substances. Results from our multivariate linear regression analysis suggested that the concentration of water quality indicators such as TN, TP and COD could be indirectly expressed by Fmax.
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Received: 23 October 2018
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