Journal
FRONTIERS IN MICROBIOLOGY
Volume 8, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fmicb.2017.01112
Keywords
aerobic methane oxidation; denitrification; O-2:CH4 ratio; intermediate accumulation; thermodynamics
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Funding
- China National Critical Project for Science and Technology on Water Pollution and Control [2014ZX07101-012]
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The O-2:CH4 ratio significantly effects nitrogen removal in mixed cultures where aerobic methane oxidation is coupled with denitrification(AME-D). The goal of this study was to investigate nitrogen removal of the AME-D process at four different O-2:CH4 ratios [0, 0.05, 0.25, and 1 (v/v)]. In batch tests, the highest denitrifying activity was observed when the O-2:CH4 ratio was 0.25. At this ratio, the methanotrophs produced sufficient carbon sources for denitrifiers and the oxygen level did not inhibit nitrite removal. The results indicated that the synergy between methanotrophs and denitrifiers was significantly improved, thereby achieving a greater capacity of nitrogen removal. Based on thermodynamic and chemical analyses, methanol, butyrate, and formaldehyde could be the main trophic links of AME-D process in our study. Our research provides valuable information for improving the practical application of the AME-D systems.
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