The performance of an anaerobic ammonium oxidation (anammox) reactor with the magnetic field of 40 mT was systematically investigated. The total nitrogen removal rate was enhanced by 16% compared with that of the control group. The enhancing mechanism was elucidated from the improved mass transfer efficiency, the complicated symbiotic interspecific relationship and the improved levels of functional genes. The magnetic field promoted formation of the loose anammox granular sludge and the homogeneous and well-connected porous structure to enhance the mass transfer. Consequently, predominated in the sludge with an increase in abundance of 13%. Network analysis showed that the positive interactions between and heterotrophic bacteria were strengthened, which established a more complicated stable microbial community. Moreover, the magnetic field increased the levels of by 26% and by 35% to promote the nitrogen metabolic process. These results provided novel insights into the magnetic field-enhanced anammox process.

中文翻译：

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关于磁场对厌氧氨氧化过程长期性能影响的内在机制的新见解


对磁场为 40 mT 的厌氧氨氧化 (anammox) 反应器的性能进行了系统研究。总氮去除率较对照组提高16%。从传质效率的提高、种间复杂的共生关系和功能基因水平的提高等方面阐明了增强机制。磁场促进了疏松的厌氧氨氧化颗粒污泥的形成和均匀且连通的多孔结构，从而增强了传质。因此，在污泥中占主导地位，丰度增加了 13%。网络分析表明，异养菌与异养菌之间的正相互作用得到加强，建立了更加复杂稳定的微生物群落。此外，磁场使氮的水平提高了26%和35%，以促进氮代谢过程。这些结果为磁场增强厌氧氨氧化过程提供了新的见解。