Impact of dissolved oxygen on the production of nitrous oxide in biological aerated filters
Qiang He, Yinying Zhu, Guo Li, Leilei Fan, Hainan Ai, Xiaoliu Huangfu, Hong Li
Impact of dissolved oxygen on the production of nitrous oxide in biological aerated filters
The dominant Cloacibacterium normanense may be responsible for N2O production.
N2O concentrations varied along the biofilm depth depending on the DO levels.
Low DO concentration leads to high N2O production rate.
Polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) and microelectrode technology were employed to evaluate the Nitrous oxide (N2O) production in biological aerated filters (BAFs) under varied dissolved oxygen (DO) concentrations during treating wastewater under laboratory scale. The average yield of gasous N2O showed more than 4-fold increase when the DO levels were reduced from 6.0 to 2.0 mg·L−1, indicating that low DO may drive N2O generation. PCR-DGGE results revealed that Nitratifractor salsuginis were dominant and may be responsible for N2O emission from the BAFs system. While at a low DO concentration (2.0 mg·L−1), Flavobacterium urocaniciphilum might play a role. When DO concentration was the limiting factor (reduced from 6.0 to 2.0 mg·L−1) for nitrification, it reduced NO2−-N oxidation as well as the total nitrification. The data from this study contribute to explain how N2O production changes in response to DO concentration, and may be helpful for reduction of N2O through regulation of DO levels.
Nitrous oxide / Biological aerated filter / Microelectrode / Dissolved oxygen / Biofilm
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