School of Environmental Science and Engineering, Tianjin University, No.135 Yaguan Road, Jinnan District, Tianjin 300350, China.
School of Environmental Science and Engineering, Tianjin University, No.135 Yaguan Road, Jinnan District, Tianjin 300350, China; Hebei Construction & Investment Group Rong Carbon Asset Management CO., LTD, 18F, Building 3, Hongrui Building, No. 6 Yuguang Street, Qiaoxi District, Shijiazhuang City, Hebei 050000, China.
Sci Total Environ. 2024 Nov 1;949:175265. doi: 10.1016/j.scitotenv.2024.175265. Epub 2024 Aug 3.
Nitrous oxide (NO) is a greenhouse gas that could accumulate during the heterotrophic denitrification process. In this study, the effects of different chemical oxygen demand to nitrogen ratio (COD/N) on NO production and electron competition was investigated. The electron competition was intensified with the decrease of electron supply, and Nos had the best electron competition ability. The model simulation results indicated that the degradation of NOx-Ns was a combination of diffusion and biological degradation. As reaction proceeding, NO could accumulate inside biofilm. A thinner biofilm and a longer hydraulic retention time (HRT) might be an effective way to control NO emission. The application of mathematical model is an opportunity to gain deep understanding of substrate degradation and electron competition inside biofilm.
一氧化二氮（NO）是一种温室气体，可能在异养反硝化过程中积累。本研究考察了不同化学需氧量与氮比（COD/N）对NO 生成和电子竞争的影响。随着电子供应的减少，电子竞争加剧，Nos 具有最佳的电子竞争能力。模型模拟结果表明，NOx-Ns 的降解是扩散和生物降解的结合。随着反应的进行，NO 可以在生物膜内积累。较薄的生物膜和较长的水力停留时间（HRT）可能是控制 NO 排放的有效方法。数学模型的应用是深入了解生物膜内基质降解和电子竞争的机会。
