Department of Environmental Science and Engineering, School of Energy and Environment, Wuxi Engineering Research Center of Taihu Lake Water Environment, Key Laboratory of Environmental Medicine Engineering, Ministry of Education, Southeast University, Nanjing, Jiangsu 210096, China; Department of Environmental Engineering, Technical University of Denmark, Kongens Lyngby 2800, Denmark.
Department of Environmental Science and Engineering, School of Energy and Environment, Wuxi Engineering Research Center of Taihu Lake Water Environment, Key Laboratory of Environmental Medicine Engineering, Ministry of Education, Southeast University, Nanjing, Jiangsu 210096, China.
Bioresour Technol. 2021 May;327:124797. doi: 10.1016/j.biortech.2021.124797. Epub 2021 Feb 2.
The nitrogen transformation performances and greenhouse gas nitrous oxide (NO) emissions in a sequencing batch reactor under chronic exposure to zinc oxide nanoparticles (ZnO NPs) were quantified and the system's self-recovery potentials were assessed. ZnO NPs posed a dose-dependent depression effect on the removal efficiencies of ammonia nitrogen (NH-N) and total nitrogen (TN), and the NO emissions. The suppressed NO emissions had a positive relationship with the activity ratios of nitrite/NO reductases and NO reductase, and were expected to be caused by the inhibited heterotrophic denitrification process. The inhibition of glucose metabolism key enzymes and electron transport chain activities would be responsible for the heterotrophic denitrification performances deterioration. Furthermore, the removal efficiencies of NH-N and TN were recovered to control levels through the nitrite-shunt. However, the NO emission increased significantly above the control during the recovery period mainly due to the irreversibility of the depressed nitrite oxidation activities.
在慢性暴露于氧化锌纳米粒子（ZnO NPs）的序批式反应器中，定量评估了氮转化性能和温室气体氧化亚氮（NO）排放，并评估了系统的自我恢复潜力。ZnO NPs 对氨氮（NH-N）和总氮（TN）及 NO 排放的去除效率表现出剂量依赖性抑制作用。被抑制的 NO 排放与亚硝酸盐/NO 还原酶和 NO 还原酶的活性比呈正相关，预计是由异养反硝化过程受到抑制所致。葡萄糖代谢关键酶和电子传递链活性的抑制将导致异养反硝化性能恶化。此外，通过亚硝酸盐旁路，NH-N 和 TN 的去除效率恢复到对照水平。然而，在恢复期间，NO 排放显著高于对照水平，主要是由于被抑制的亚硝酸盐氧化活性不可逆转。
