反硝化细菌
反硝化
自养
异养
化学
环境化学
硝酸盐
氮气
细菌
生物
有机化学
遗传学
作者
Haolin Chen,Meiyi Tang,Liang He,Xinxin Xiao,Fei Yang,Qiulai He,Shiquan Sun,Yang Gao,Lean Zhou,Yifu Li,Julong Sun,Wei Zhang
标识
DOI:10.1016/j.biortech.2024.131432
摘要
In this study, the effect of modulating fulvic acid (FA) concentrations (0, 25 and 50 mg/L) on nitrogen removal in a bioelectrochemical hydrogen autotrophic denitrification system (BHDS) was investigated. Results showed that FA increased the nitrate (NO3–-N) removal rate of the BHDSs from 37.8 to 46.2 and 45.2 mg N/L·d with a current intensity of 40 mA. The metagenomic analysis revealed that R2 (25 mg/L) was predominantly populated by autotrophic denitrifying microorganisms, which enhanced denitrification performance by facilitating electron transfer. Conversely, R3 (50 mg/L) exhibited an increase in genes related to the heterotrophic process, which improved the denitrification performance through the collaborative action of both autotrophic and heterotrophic denitrification pathways. Besides, the study also identified a potential for nitrogen removal in Serpentinimonas, which have been rarely studied. The interesting set of findings provide valuable reference for optimizing BHDS for nitrogen removal and promoting specific denitrifying genera within the system.
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