Assessing organic matter removal from municipal wastewater by excitation-emission matrix fluorescence
LI Hai-bo1,2,3, SUN Chen2,3, LIU Xiao-ling2,3, TIAN Zhi-yong2,3, XIANG Lian-cheng2,3, WANG Si-yu2,3, ZHOU Bei-hai1
1. Department of Environmental Engineering, School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;
3. Department of Urban Water Environmental Research, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
A novel Enhanced Biological Phosphorus Removal (EBPR)-Sulfur Autotrophic Denitrification integrated system was applied to treatment of municipal wastewater with low COD/TN ratio. Its pollutants removal performance was evaluated by the combination of fluorescence regional integration, materials balance calculation and redundancy analysis. The results showed that, with the influent COD/TN ratio of 4.5~6.0, the average effluent concentrations of TN, NH4+-N and TP were 1.31, 1.11 and 0.23mg/L, and the corresponding removal rates reached 96.3%, 96.0% and 86.9%, respectively. Moreover, the normalized integral volumes of regions I~V were decreased by 73.7%, 64.3%, 46.9%, 61.3% and 31.8%, respectively. Material balance calculation further indicated that the aromatic protein-like and the soluble microbial byproduct-like materials were significantly decreased in the non-aerobic zones; the aromatic protein-like and the fulvic acid-like materials were more effectively removed in the aerobic zone. Meanwhile, redundancy analysis showed that phosphorus releasing was correlated with soluble microbial byproduct-like materials. In addition, autotrophic nitrification, phosphorus uptake and organic matter removal could simultaneously occur in the aerobic zone.
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