Frontiers of Environmental Science & Engineering
>> 2017,
Volume 11,
Issue 6
doi:
10.1007/s11783-017-0964-0
RESEARCH ARTICLE
Impact of dissolved oxygen on the production of nitrous oxide in biological aerated filters
Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400045, China
Available online: 2017-07-10
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Abstract
Polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) and microelectrode technology were employed to evaluate the Nitrous oxide (N O) production in biological aerated filters (BAFs) under varied dissolved oxygen (DO) concentrations during treating wastewater under laboratory scale. The average yield of gasous N O showed more than 4-fold increase when the DO levels were reduced from 6.0 to 2.0 mg·L , indicating that low DO may drive N O generation. PCR-DGGE results revealed that were dominant and may be responsible for N O emission from the BAFs system. While at a low DO concentration (2.0 mg·L ), might play a role. When DO concentration was the limiting factor (reduced from 6.0 to 2.0 mg·L ) for nitrification, it reduced NO -N oxidation as well as the total nitrification. The data from this study contribute to explain how N O production changes in response to DO concentration, and may be helpful for reduction of N O through regulation of DO levels.
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