Nitrogen Removal with Aerobic Granules – Effect of Dissolved Oxygen and Carbon/Nitrogen Ratio

Nitrogen removal efficiency related to the dissolved oxygen (DO) concentration (DO 1-7 mg l -1 ), carbon/nitrogen ratio (COD/N 1-14), and the effect of airflow (0.4-2.9 l min -1 ) related to the granule size were investigated.The average chemical oxygen demand (COD) removal of ≥ 90 % was achieved at COD/N ≥ 11, but the satisfactory N values in effluent for discharge into the surface waters were almost achieved at COD/N 14. DO of 2 mg l -1 is recommended for efficient removal of N and COD with mature granules.The size (diameter) of the granules decreases with increased airflow.

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