期刊
ENVIRONMENTAL POLLUTION
卷 273, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2021.116436
关键词
Dissolved organic nitrogen; Wastewater treatment; Transformation; Biosynthesis; Ecotoxicity
资金
- National Key R&D Program of China [2019YFC0408800]
- Fundamental Research Funds for the Central Universities [2020FZZX001-06]
- Open Project of State Key Laboratory of Urban Water Resource and Environment [QA201934]
This article systematically reviewed the characteristics, transformation and ecological impacts of wastewater dissolved organic nitrogen (DON), highlighting the dominant role of biological treatment processes in DON transformation. However, critical knowledge gaps and issues that need to be addressed still exist.
With the upgrade of wastewater treatment plants (WWTPs) to meet more stringent discharge limits for nutrients, dissolved organic nitrogen (DON) is present at an increasing percentage (up to 85%) in the effluent. Discharged DON is of great environmental concern due to its potentials in stimulating algal growth and forming toxic nitrogenous disinfection by-products (N-DBPs). This article systematically reviewed the characteristics, transformation and ecological impacts of wastewater DON. Proteins, amino acids and humic substances are the abundant DON compounds, but a large fraction (nearly 50%) of DON remains uncharacterized. Biological treatment processes play a dominant role in DON transformation (65-90%), where DON serves as both nutrient and energy sources. Despite of the above progress, critical knowledge gaps remain in DON functional duality, relationship with dissolved inorganic nitrogen (DIN) species, and coupling/decoupling with the dissolved organic carbon (DOC) pool. Development of more rapid and accurate quantification methods, modeling transformation processes, and assessing DON-associated eutrophication and N-DBP formation risks should be given priority in further investigations. (C) 2021 Elsevier Ltd. All rights reserved.
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