Abstract
A laboratory scale aeration treatment system was built to study the fate of nitrogen during aeration of pig slurry. For each run evaluated, the nitrogen mass balance was determined including measurement of the nitrous oxide gas emissions. Intermittent aeration led to a nitrogen removal of about 53% of the total nitrogen content of the raw slurry. About 18% of the total nitrogen content of the raw slurry was emitted as N 2O during aeration with an aerobic to anoxic ratio equal to 0.625. In contrast, the extension of the anoxic period (aerobic to anoxic ratio=0.375) allowed complete denitrification and avoided N 2O emissions.
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