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Impact of dissolved oxygen on the production of nitrous oxide in biological aerated filters

Author:
He, Qiang, Zhu, Yinying, Li, Guo, Fan, Leilei, Ai, Hainan, Huangfu, Xiaoliu, Li, Hong
Source:
Frontiers of environmental science & engineering 2017 v.11 no.6 pp. 16
ISSN:
2095-2201
Subject:
Flavobacterium, Nitratifractor, biofilters, denaturing gradient gel electrophoresis, dissolved oxygen, greenhouse gas emissions, nitrification, nitrites, nitrous oxide, oxidation, polymerase chain reaction, wastewater
Abstract:
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 NO ₂ ⁻ -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.
Agid:
5744929