Abstract
Pilot-scale experiments were carried out in a sequencing batch reactor to study the effect of operational modes/conditions of aeration on the emission of N2O during sewage treatment. The results showed that the flow-based emission factor of N2O under the aeration mode of 60-min anoxic/60-min aeration decreased from 0.75 to 0.42 g (ton of wastewater)−1 with the aeration rate increasing from 0.6 to 1.2 m3 h−1. This emission factor was lower than that under the aeration mode of 30-min anoxic/90-min aeration, which was 0.61–1.57 g (ton of wastewater)−1 within the same studied range of aeration rate. When the aeration rate was lowered to 0.3 m3 h−1, a smallest emission rate of N2O of 0.16–0.28 g (ton of wastewater)−1 was observed because of decreased removal efficiencies of NH4+–N (54.3%–57.8%) with insufficient O2 supply.
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