Response of dissolved organic matter and disinfection by-product precursors to algal blooms and thermal stratification in deep reservoirs

Algal bloom contribute substantially to dissolved organic matter (DOM) and disinfection by-product (DBP) precursors in deep reservoirs, threatening drinking water safety. However, the variations in DOM and DBP precursors in deep-water reservoirs during algal bloom remain unclear. UV and fluorescence...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2024-11, Vol.368, p.143757, Article 143757
Main Authors: Ji, Gang, Li, Kai, Hou, Yi, Xue, Ruikang, Huang, Kangzhe, Lv, He, Huang, Tinglin, Wen, Gang
Format: Article
Language:English
Subjects:
Algal bloom
Biodegradation, Environmental
Deep reservoirs
Disinfectants - analysis
Disinfection
Disinfection by-products precursors
Dissolved organic matter
Drinking Water - chemistry
Eutrophication
Temperature
Thermal stratification
Water Pollutants, Chemical - analysis
Water Purification - methods
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Summary:Algal bloom contribute substantially to dissolved organic matter (DOM) and disinfection by-product (DBP) precursors in deep reservoirs, threatening drinking water safety. However, the variations in DOM and DBP precursors in deep-water reservoirs during algal bloom remain unclear. UV and fluorescence spectroscopy and chlorination experiments were used to analyze the variations in DOM and DBP precursors during algal bloom in the Sanhekou Reservoir. Before algal bloom, the DOM and DBP precursors decreased due to biodegradation. After algal bloom, the DOM and DBP precursors increased by 48.3% and 86.9% due to algae producing protein-like compounds. Notably, the algal bloom produced a range of nitrogenous compounds that significantly promote the formation of trichloronitromethane, a major contributor to the mammalian cytotoxicity associated with DBPs. In addition, the heterogeneous matrix led to the stratification of DOM and DBP precursors. The surface water (0–5 m) was more vulnerable to algae, with protein-like components being much higher than in other layers, while humic and fulvic-like components were much lower. However, high temperatures and sufficient oxygen conditions accelerated the biodegradation of DOM and DBP precursors, resulting in significantly lower levels of DOM and DBP precursors in the surface water compared to other layers (p 
ISSN:0045-6535
1879-1298
1879-1298
DOI:10.1016/j.chemosphere.2024.143757