Abstract
The direct discharge of wastewater can cause severe damage to the water environment of the surface water. However, the influence of dissolved organic matter (DOM) present in wastewater on the allocation of DOM, nitrogen (N), and phosphorus (P) in rivers remains largely unexplored. Addressing the urgent need to monitor areas affected by direct wastewater discharge in a long-term and systematic manner is crucial. In this paper, the DOM of overlying water and sediment in the WWTPs-river-integrated area was characterized by ultraviolet–visible absorption spectroscopy (UV–vis), three-dimensional excitation-emission matrix combined with parallel factor (PARAFAC) method. The effects of WWTPs on receiving waters were investigated, and the potential link between DOM and N, P pollution was explored. The pollution risk was fitted and predicted using a spectral index. The results indicate that the improved water quality index (IWQI) is more suitable for the WWTPs-river integration zone. The DOM fraction in this region is dominated by humic-like matter, which is mainly influenced by WWTPs drainage as well as microbial activities. The DOM fractions in sediment and overlying water were extremely similar, but fluorescence intensity possessed more significant spatial differences. The increase in humic-like matter facilitates the production and preservation of P and also inhibits nitrification, thus affecting the N cycle. There is a significant correlation between DOM fraction, fluorescence index, and N, P. Fluorescence index (FI) fitting of overlying water DOM predicted IWQI and trophic level index, and a(254) fitting of sediment DOM predicted nitrogen and phosphorus pollution risk (FF) with good results. These results contribute to a better understanding of the impact of WWTPs on receiving waters and the potential link between DOM and N and P pollution and provide new ideas for monitoring the water environment in highly polluted areas.
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The authors are also grateful to the anonymous referees for their constructive comments.
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This study was supported by a grant from the Heilongjiang Key Research and Development Program, Guidance Category (GZ20220138), Heilongjiang Key Research and Development Program, Guidance Category (GZ20210061), Open Project of State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (ES202116).
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T.D. contributed to conceptualization, methodology, software, formal analysis, investigation, writing—original draft, writing—review and editing, and visualization. L.W. contributed to writing—review and editing and funding acquisition. T.L. contributed to writing—review and editing, resources, and funding acquisition. P.Q. contributed to investigation, supervision, and resources. J.W. contributed to project administration. Haotian Song contributed to investigation.
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Dai, T., Wang, L., Li, T. et al. Potential linkage between WWTPs-river-integrated area pollution risk assessment and dissolved organic matter spectral index. Environ Geochem Health 45, 6693–6711 (2023). https://doi.org/10.1007/s10653-023-01637-1
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DOI: https://doi.org/10.1007/s10653-023-01637-1