Fine resolution of complex pollution sources in urban river channels based on DOM spectral data

MA Haichuan; REN Cheng; MAO Yunfei; ZHOU Kefan; ZHU Hantao; DUAN Niangming; LUO Yi; YU Xubiao

doi:10.13205/j.hjgc.202502003

Volume 43 Issue 2

Feb. 2025

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MA Haichuan, REN Cheng, MAO Yunfei, ZHOU Kefan, ZHU Hantao, DUAN Niangming, LUO Yi, YU Xubiao. Fine resolution of complex pollution sources in urban river channels based on DOM spectral data[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(2): 21-30. doi: 10.13205/j.hjgc.202502003

Citation:

MA Haichuan, REN Cheng, MAO Yunfei, ZHOU Kefan, ZHU Hantao, DUAN Niangming, LUO Yi, YU Xubiao. Fine resolution of complex pollution sources in urban river channels based on DOM spectral data[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(2): 21-30. doi: 10.13205/j.hjgc.202502003

Citation:

MA Haichuan, REN Cheng, MAO Yunfei, ZHOU Kefan, ZHU Hantao, DUAN Niangming, LUO Yi, YU Xubiao. Fine resolution of complex pollution sources in urban river channels based on DOM spectral data[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(2): 21-30. doi: 10.13205/j.hjgc.202502003

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Fine resolution of complex pollution sources in urban river channels based on DOM spectral data

doi: 10.13205/j.hjgc.202502003

1. School of Civil & Environmental Engineering and Geography Science, Ningbo University, Ningbo 315000, China;
2. Ningbo Urban Drainage Co., Ltd., Ningbo 315000, China;
3. School of Environmental and Resource Sciences, Zhejiang A&F University, Hangzhou 311300, China

Received Date: 2024-07-04
Accepted Date: 2024-12-20
Rev Recd Date: 2024-11-09

Abstract

Abstract

Improving urban river water quality is fraught with challenges, such as poor water flow and complex pollution sources, making it a significant difficulty in current water environment enhancement efforts. To achieve a nuanced analysis of the causes of urban river pollution and ensure the precision and reliability of remediation strategies, this study focused on a typical urban river in Ningbo City. Employing three-dimensional fluorescence-parallel factor analysis (EEM-PARAFAC) to examine the composition characteristics of dissolved organic matter (DOM) in the water, this research investigated the seasonal variations in urban river pollution and the rapid source-tracing mechanisms under complex pollution conditions. The findings revealed that the river exhibited high nutrient pollution, with average concentrations of ammonia nitrogen, total nitrogen, and total phosphorus at (2.53±1.16), (6.17±1.57), and (0.40±0.15) mg/L, respectively. During the dry season, the average nutrient concentrations in the water were 1.44 to 1.72 times higher than those in the wet season. Indicators of DOM humification degree, HIX, and SUVA₂₅₄, suggested a significant accumulation of autochthonous pollutants in the water during the dry season. The correlation between nutrient salts concentrations and protein-like fluorescent components (r=0.07, P > 0.05) was much lower than that with humic-like fluorescent components (r=0.58, P<0.001). This indicated that agricultural non-point source pollution was significantly higher than the impact of domestic sewage, closely linked to the ongoing implementation of sewage interception measures in recent years. Moreover, by comparing the spatial and temporal distribution differences of major pollutants and EEM-PARAFAC fluorescent components, it was confirmed that the abnormal increase in nitrogen and phosphorus concentrations in the upstream river section was directly related to the discharge of farmland tailwater, eliminating the possibility of domestic sewage influencing the downstream residential river section. This underscored the importance of DOM spectral data in assisting the determination of pollution causes. Given the extensive pollution source information contained in DOM spectral data and its straightforward testing process, the research can provide substantial support for improving the water quality of urban rivers in China.
- dissolved organic matter,
- EEM-PARAFAC technology,
- river pollution,
- pollution source apportionment,
- water quality management

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References(55)

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