Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China.
Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China.
Bioresour Technol. 2023 Sep;384:129283. doi: 10.1016/j.biortech.2023.129283. Epub 2023 Jun 3.
The slow growth and difficulty in cultivating anammox bacteria limit the rapid start-up of anammox process and effective microbial enrichment. In this study, microbial electrolysis cell (MEC) was coupled with anammox to investigate the effects of different applying voltage methods on substrate removal efficiency and rates, microbial community structure, anammox metabolism and metabolic pathways. The results showed that applying voltage not only improved NH-N removal efficiency and removal rates, but also promoted electron transfer efficiency, key enzyme activity and extracellular polymeric substances (EPS) secretion in the systems. Step-up voltage was more conducive to the growth of Candidatus_Kuenenia in the cathode, which promoted the rapid start-up of anammox and treating wastewater with low ammonia concentration. The main metabolic pathway in step-up voltage operation was hydrazine to nitrogen, while in constant voltage operation was hydroxylamine oxidation pathway. These findings provided a new insight into the enhancement and operation of anammox system.
厌氧氨氧化菌的缓慢生长和培养困难限制了厌氧氨氧化工艺的快速启动和有效微生物富集。本研究将微生物电解池（MEC）与厌氧氨氧化耦合，考察了不同施加电压方式对基质去除效率和速率、微生物群落结构、厌氧氨氧化代谢及其代谢途径的影响。结果表明，施加电压不仅提高了 NH-N 的去除效率和去除速率，而且促进了系统中的电子传递效率、关键酶活性和胞外聚合物（EPS）的分泌。升压更有利于阴极中 Candidatus_Kuenenia 的生长，促进了厌氧氨氧化的快速启动和低氨浓度废水的处理。升压操作的主要代谢途径是肼到氮，而恒压操作的途径是羟胺氧化途径。这些发现为增强和操作厌氧氨氧化系统提供了新的思路。
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