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Outline
In order to investigate the stability of the biological anode-dependent ammonium oxidation process, this study was conducted to explore the operational performances and the associated microbiological characteristics of a microbial fuel cell (MFC) based on biological anode-dependent ammonium oxidation (bioanoammox) under influent carbon-nitrogen ratio (C/N) constraints. The results showed that, the influent C/N could affect microbial community structure in the electroactive biofilm, leading to fluctuation of nitrogen removal and electricity generation in the bioanoammox system. As the influent C/N increased from 0.0 to 3.0, the enrichment of denitrifying bacteria could be achieved in the MFC, resulting that TN removal rates of the system increased due to the coupling of denitrification with bioanoammox. Meanwhile, the synergy of Geobacter with the two functional genera (namely Nitrosomonas and Candidatus Brocadia) also enhanced nitrogen removal and electricity generation performance of the system. However, as the influent C/N was more than 3.0, Geobacter preferentially utilized organic carbon as the anodic substrate and proliferated excessively in the MFC, nitrogen conversion processes (including denitrification and bioanoammox, etc.) in the device were then inhibited resulting from the alteration in the metabolic pathway of Geobacter, ultimately leading to deterioration in nitrogen removal of the MFC. Regarding to the MFC with influent C/N of 3.0, the operational performance of the system was optimized, resulting that its COD, TN and NH4+-N removal rates could respectively reached up to (93.09±0.86)%, (94.89±0.38)%, and (95.24±0.27)% during the stable operation phase, as well as the maximum power density of 85.16mW/m3. Correspondingly, Nitrosomonas, Candidatus Brocadia, Empedobacter, Geobacter, Thauera, Pseudomonas, Zoogloea, and Dechloromonas were the dominant bacterial genera in the electroactive biofilm.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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