光谱学与光谱分析 |
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The Influence of Runoff Pollution to DOM Features in an Urban Wastewater Treatment Plant |
HE Li1, JI Fang-ying1*, LAI Ming-sheng1, XU Xuan1, ZHOU Wei-wei1,MAO Bo-lin2, YANG Ming-jia2 |
1. Key Laboratory of Three Gorges Reservoir Region’s Eco-Environment,Ministry of Education, Chongqing University, Chongqing 400045, China 2. Ji Guan Shi Wastewater Treatment Tlant, Chongqing Wastewater Group Co., Ltd., Chongqing 400061, China |
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Abstract Combined with wastewater treatment process, the sewage in sunny and rainy day was collected from a wastewater treatment plant in Chongqing. Three-dimensional fluorescence spectra was used to investigate the characteristic fluorescence of dissolved organic matter (DOM). DOM dissolved organic carbon (DOC), chemical oxygen demand (COD), fluorescence index (f450/500) and fluorescence intensity ratio r(A, C) of fulvic acid in ultraviolet and visible region wereused to analyze the impact of rain runoff pollution on sewage DOM. According tothe experimental data,the DOM fluorescence fingerprints of this wastewater treatment plant were quite different from typical municipal sewage, and the main component was tryptophan with low excitation wavelength (Peak S), then the tryptophan with long wavelength excitation (Peak T) followed. A2/O process had an approximative degradation of the protein-like both in sunny day and rainy day, but had a better degradation of fulvic-like, DOC and COD in rainy day thanthat in sunny day. Morever, the fluorescence peaks got red-shifted after the biological treatment. The differences of DOM fluorescence fingerprint between sunny and rainy day were significant, the fluorescence center of UV fulvic (Peak A) in rainy day getting blue-shifted obviously, shifting from 240~248/390~440 to 240~250/370~400 nm. Although the DOM types in sunny and rainy day were the same, the source of fulvic got more complex by runoff and the component ratioof DOM also changed. Compared with the sunny day, the proportion of Peak S in DOM dereased by 10%, and the proportion of Peak A increased by 7% in rainy day.
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Received: 2013-06-24
Accepted: 2013-10-15
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Corresponding Authors:
JI Fang-ying
E-mail: jfy@cqu.edu.cn
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