Zheng Fang, Wang Jie, Xiao Rui, Chai Wenbo, Xing Defeng, Lu Huijie
Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental Resource Sciences, Zhejiang University, 310058, Hangzhou, China.
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China.
Environ Pollut. 2021 Jan 6;273:116436. doi: 10.1016/j.envpol.2021.116436.
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.
随着污水处理厂（WWTPs）的升级以满足更严格的营养物排放限值，溶解性有机氮（DON）在出水 中的占比越来越高（高达 85%）。排放的 DON 因其刺激藻类生长和形成有毒含氮消毒副产物（N-DBPs） 的潜在可能性而备受环境关注。本文系统综述了废水 DON 的特性、转化和生态影响。蛋白质、氨基酸 和腐殖质是丰富的 DON 化合物，但很大一部分（近 50%）的 DON 仍未得到表征。生物处理过程在 DON 转化中起主导作用（65-90%），其中 DON 既是营养源又是能源。尽管有上述进展，但在 DON 的功能 二元性、与溶解性无机氮（DIN）物种的关系以及与溶解性有机碳（DOC）库的耦合/解耦方面仍存在关 键的知识空白。在进一步研究中，应优先开发更快速准确的定量方法、模拟转化过程以及评估与 DON 相关的富营养化和 N-DBP 形成风险。
