Analysis of Two Stage Effluent from Sewage Treatment Plant by 3D-EEMs and PARAFAC
LÜ Jing-jing1, 2, DOU Yan-yan1, GONG Wei-jin1, DUAN Xue-jun1, 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
Abstract：The vertical distribution characteristics of nitrogen, phosphorus and DOM in secondary effluent of soil infiltration WWTP were studied by 3D-EEMs and PARAFAC. The experiment was carried out on a pilot-scale soil infiltration system with a sampling port at 30 cm intervals from top to bottom. The collected samples were identified by PARAFAC model as having 4 fluorescent components at different points in the system, including two humus substances (C1, C2) and two protein substances (C3, C4) respectively. Fmax analysis showed that the tryptophan represented by C4 was more easily degraded than other three kinds of substances, that is, tryptophan was the most easily degraded, followed by fulvic acid, humic acid and protein-like substances. The Fmax variation of the four components was the largest at 0~30 cm, which showed that the biochemical reaction was the most intense and the migration and transformation rate of DOM was the highest. The source of DOM in soil infiltration system and the variation law of DOM in different depths could be revealed by means of PARAFAC, PCA and CA. Soil infiltration system was unfavorable for TN and nitrate removal in treating secondary effluent of sewage treatment plant under 4 L·d-1 low load condition. The subsequent denitrification processes such as denitrification filter could be coupled to enhance denitrification and nitrogen removal rate. The adsorption of phosphorus on soil had not yet reached saturation state, and had maintained a high TP removal efficiency.
Key words：Dissolved organic matter; Soil infiltration; Three-dimensional excitation-emission matrix fluorescence spectroscopy; PARAFAC; Two stage effluent of WWTP
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