School of Water and Environment, Chang'an University, Xi'an 710054, China; Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of the Ministry of Education, Chang'an University, Xi'an 710054, China.
School of Water and Environment, Chang'an University, Xi'an 710054, China; Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of the Ministry of Education, Chang'an University, Xi'an 710054, China.
Bioresour Technol. 2023 Oct;386:129566. doi: 10.1016/j.biortech.2023.129566. Epub 2023 Jul 26.
The nitrogen removal efficiency and distribution of microbial community in a denitrification process aided by zero-valent iron (ZVI) under low carbon-to-nitrogen ratio (C/N) were assessed in this study. Experimental results demonstrated that the nitrogen removal efficiency (TNRE) increased to 96.4 ± 2.72% and 63.3 ± 4.02% after continuous addition of ZVI with molar ratio of ZVI to nitrate (NO-N) (ZVI/N) of 6 at C/N of 3 and 2, respectively, which was 4% and 7.7% higher than the blank one. Meanwhile, extracellular polymeric substance (EPS) could be used as electron transfer medium and endogenous carbon source for denitrification system and also the production of which increased by 28.43% and 53.10% under ZVI stimulation compared to the control group. Finally, a symbiotic system composed by autotrophic and heterotrophic denitrification bacteria was formed by aid of ZVI. This study proposed new insights into denitrification process improved by ZVI.
本研究评估了在低碳氮比（C/N）条件下零价铁（ZVI）辅助反硝化过程中微生物群落的氮去除效率和分布。实验结果表明，连续添加 ZVI（ZVI 与硝酸盐（NO-N）的摩尔比为 6）后，氮去除效率（TNRE）分别提高到 96.4±2.72%和 63.3±4.02%，在 C/N 为 3 和 2 时，分别比空白组高 4%和 7.7%。同时，胞外聚合物（EPS）可用作电子转移介质和反硝化系统的内源性碳源，与对照组相比，在 ZVI 刺激下，其产量分别增加了 28.43%和 53.10%。最后，通过 ZVI 的辅助，形成了由自养和异养反硝化细菌组成的共生系统。本研究为 ZVI 改善反硝化过程提供了新的见解。
