Analyzing the Pollution Sources and Mechanisms of Urban Rivers Based on Identifying the Molecular Signature of Dissolved Organic Matter

被引：1

作者：

Zhu Y. ^{[1
]}

Ye J.-F. ^{[1
]}

Sun X.-N. ^{[2
]}

Hu S.-Y. ^{[2
]}

Chen X. ^{[2
]}

Tang J.-F. ^{[2
]}

Chen H. ^{[2
]}

机构：

[1] School of Environmental Science and Engineering, Tongji University, Shanghai

[2] Shanghai Academy of Environmental Sciences, Shanghai

来源：

Huanjing Kexue/Environmental Science | 2023年 / 44卷 / 08期

关键词：

compound group; dissolved organic matter (DOM); elemental composition; Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS); urban river;

D O I：

10.13227/j.hjkx.202210063

中图分类号：

学科分类号：

摘要：

Dissolved organic matter (DOM) is an essential component of river pollutants. Under the new situation of black water treatment in urban areas of China, in view of the widespread problem of unclear sources of multiple pollutants, further analysis of DOM components in urban rivers from the molecular level is a key link to deeply explore the sources, causes, and mechanism of river pollution so as to achieve efficient management. In this study, the urban rivers in the central city were selected as the research object, and a total of five rivers were selected that were seriously affected by the discharge sewage of four combined and separated sewer systems, respectively. Using Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS), this study identified the molecular formulae and analyzed the elemental composition and compound groups of DOM in water and sediment samples at each site in dry and wet weather. The results showed that: ① although CHO molecules and lignins were the main compounds in the urban river DOM, the high proportion of lipids, proteins, and heteroatomic compounds (especially CHOS molecules) revealed the anthropogenic pollution in rivers, which also led to the increase in DOC, TN, and NH4+ -N. ②Surfactants such as C17 H28 O3 S and C18 H30 O3 S were ubiquitous in all urban rivers, which could be used as markers of domestic wastewater pollution. ③ In wet weather, the rainfall inputs, storm runoffs, and hydraulic disturbance jointly led to the increase in the proportion of CHO molecules and lignin compounds; the decrease in proteins and lipids; the rise of DOC, TN, and NH4+ -N concentrations in river water; and the decrease in DOC, TN, and NH4+ -N concentrations and proteins and lipids in river sediments. ④ The abundance of multi-heteroatomic compounds and condensed aromatics in the combined sewer system was higher than that in the separated sewer system, which may have been more severely polluted by domestic wastewater and storm runoff, especially kitchen wastewater. This study provides new insight for clarifying the critical causes of pollution in the new stage and provides an essential basis for further precision prevention and control of water pollution. © 2023 Science Press. All rights reserved.

引用

页码：4353 / 4363

页数：10

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