Abstract
Nitrate-denitrifying anaerobic methane oxidation (Nitrate-DAMO) process is a novel bioprocess which couples anaerobic oxidation of methane (AOM) with nitrite/nitrate reduction. In this study, one Nitrate-DAMO culture contains both DAMO bacteria (62.2%) and DAMO archaea (26.5%). The environmental conditions, temperature, pH, and dissolved oxygen were found to affect Nitrate-DAMO activity significantly. When temperature was below 35 °C, Nitrate-DAMO reaction rate dropped as temperature decreased, and when temperature was above 35 °C, Nitrate-DAMO reaction rate decreased as temperature rose; Nitrate-DAMO reaction rate reached maximum at 35 °C. When pH was below 6.5, Nitrate-DAMO reaction rate decreased with the decrease of pH, and when pH was above 7.5, Nitrate-DAMO reaction rate decreased as pH rose; the maximum Nitrate-DAMO reaction rate appeared at both pH 6.5 and 7.5. Nitrate-DAMO activity was inversely proportional to dissolved oxygen concentration, which meant the existence of dissolved oxygen inhibited Nitrate-DAMO process.
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This research was financially supported by the Natural Science Foundation of Zhejiang Province, China (No. Y12E080076), and the central government especially supported funding for the development of local colleges and universities (No. S1701).
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Practitioner Points
1) Temperature was a major factor that influenced Nitrate-DAMO process.
2) pH significantly affected the Nitrate-DAMO activity.
3) Dissolved oxygen was found to have strong inhibitory effect on Nitrate-DAMO microbes.
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Lou, J., Lv, J. & Yang, D. Effects of Environmental Factors on Nitrate-DAMO Activity. Water Air Soil Pollut 231, 263 (2020). https://doi.org/10.1007/s11270-020-04640-9
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DOI: https://doi.org/10.1007/s11270-020-04640-9