Effects of Environmental Factors on Nitrate-DAMO Activity
2020
Lou, Juqing | Lv, Jiao | Yang, Dongye
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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