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The partial nitritation/anammox process (PN/A) could be a promising alternative for nitrogen removal from high-strength wastewater. There is, however, a lack of information about suitable aeration and temperature for PN/A in single-stage reactors for high-strength wastewater, such as food waste (FW) digestate treatment. To this end, a laboratory-scale (10 L) partial nitritation/anammox sequencing batch reactor was operated for more than 230 days under four different intermittent aeration strategies and temperature variations (35°C and ambient temperature – 26–29°C) to investigate the feasibility of nitrogen removal from real FW digestate. High ammonium (-N) and total nitrogen (TN) removal median efficiencies of 81 and 63%, respectively (corresponding to median-N and TN loads removed of 76 and 67 g.m −3 .d −1 ), were achieved when the aeration strategy comprised by 7 min/14 min off and an airflow rate of 0.050 L.min −1 .L reactor−1  was applied. Nitrogen removal efficiencies were not affected by temperature variations in southeastern Brazil. COD, chloride and organic nitrogen (520, 239 and 102.8 mg.L −1 , respectively) did not prevent PN/A. Changes of the bacterial community in response to aeration strategies were observed.  Candidatus Brocadia  dominated most of the time being more resistant to aeration and temperature changes than  Candidatus Jettenia . This study demonstrated that optimizations of anoxic periods and airflow rate support PN/A with high nitrogen removal from FW digestate.

environmental technology

Aeration strategies and temperature effects on the partial nitritation/anammox process for nitrogen removal: performance and bacterial community assessment