期刊
WATER
卷 13, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/w13020210
关键词
comammox; heterotrophic denitrification; intermittent aeration; municipal wastewater treatment; nitrifier denitrification; nitrous oxide
资金
- National Natural Science Foundation of China [41701278]
- Fundamental Research Funds for the Central Universities [2019MS041]
- Shanghai Committee of Science and Technology [19DZ1204302]
- China Postdoctoral Science Foundation [2019M660333]
Intermittent aeration in wastewater treatment can enhance total nitrogen removal efficiency, decrease N2O emission, and promote quick nitrification-denitrification processes.
To explore the main behavior and mechanism of minimizing nitrous oxide (N2O) emission through intermittent aeration during wastewater treatment, two lab-scale sequencing batch reactors operated at intermittently aerated mode (SBR1), and continuously aerated mode (SBR2) were established. Compared with SBR2, the intermittently aerated SBR1 reached not only a higher total nitrogen removal efficiency (averaged 93.5%) but also a lower N2O-emission factor (0.01-0.53% of influent ammonia), in which short-cut nitrification and denitrification were promoted. Moreover, less accumulation and consumption of polyhydroxyalkanoates, a potential endogenous carbon source promoting N2O emission, were observed in SBR1. Batch experiments revealed that nitrifier denitrification was the major pathway generating N2O while heterotrophic denitrification played as a sink of N2O, and SBR1 embraced a larger N2O-mitigating capability. Finally, quantitative polymerase chain reaction results suggested that the abundant complete ammonia oxidizer (comammox) elevated in the intermittently aerated environment played a potential role in avoiding N2O generation during wastewater treatment. This work provides an in-depth insight into the utilization of proper management of intermittent aeration to control N2O emission from wastewater treatment plants.
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