State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China.
State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China.
Bioresour Technol. 2023 Jul;379:129038. doi: 10.1016/j.biortech.2023.129038. Epub 2023 Apr 8.
This study explored the influence and mechanism of microalgae on simultaneous nitrification and denitrification (SND) in microalgal-bacterial sequencing batch reactors (MB-SBR). It particularly focused on nitrogen transformation in extracellular polymeric substances (EPS) and functional groups associated with nitrogen removal. The results showed that MB-SBR achieved more optimal performance than control, with an SND efficiency of 68.01% and total nitrogen removal efficiency of 66.74%. Further analyses revealed that microalgae changed compositions and properties of EPS by increasing EPS contents and improving transfer, conversion, and storage capacity of nitrogen in EPS. Microbial community analysis demonstrated that microalgae promoted the enrichment of functional groups and genes related to SND and introduced diverse nitrogen removal pathways. Moreover, co-occurrence network analysis elucidated the interactions between communities of bacteria and microalgae and the promotion of SND by microalgae as keystone connectors in the MB-SBR. This study provides insights into the roles of microalgae for enhanced SND.
本研究探讨了微藻对微藻-细菌序批式反应器（MB-SBR）中同步硝化反硝化（SND）的影响和作用机制。特别关注了与氮去除相关的胞外聚合物（EPS）和功能基团中的氮转化。结果表明，MB-SBR 比对照达到了更优的性能，SND 效率为 68.01%，总氮去除效率为 66.74%。进一步分析表明，微藻通过增加 EPS 含量和提高 EPS 中氮的传递、转化和储存能力，改变了 EPS 的组成和性质。微生物群落分析表明，微藻促进了与 SND 相关的功能基团和基因的富集，并引入了多种氮去除途径。此外，共生网络分析阐明了细菌和微藻群落之间的相互作用，以及微藻作为 MB-SBR 中关键连接体对 SND 的促进作用。本研究为增强 SND 中微藻的作用提供了深入了解。
