Linking the Nitrogen and One-Carbon Cycles - The Impact of Inorganic Carbon Limitation on Ammonia Oxidation and Nitrogen Oxide Emission Rates in Ammonia Oxidizing Bacteria

摘要

Experiments were performed to investigate the impact of inorganic carbon (IC) limitation onammonia oxidizing bacteria (AOB). Results confirm that ammonia removal efficiency and AOBrespiration rates are negatively impacted by IC limitation. Increased nitrogen oxides emissions(nitric and nitrous oxides (NO and N_2O)) were also observed in IC limited reactors as comparedwith control reactors. These findings suggest that the metabolic response of AOB to IC limitationcan elicit a previously undocumented increase in nitrogen oxide emission. These results furthersupport the recently postulated link between low ammonia oxidation process efficiency andincreased NO and N_2O emissions.