Influence of intermittent aeration on the stability of simultaneous nitrification and denitrification
间歇曝气模式对同步硝化反硝化稳定性的影响

The present paper reports the results of the application of a sequencing batch reactor (SBR) to treat low carbon municipal wastewater under different intermittent aeration (IA) modes. The ORP and pH profiles and the stability of simultaneous nitrification and denitrification (SND) were correlated. The results showed that 92% of TN was removed in IA with aeration fraction of 0.5 and high air-on frequency. Under these conditions, the best average level of ORP and stability of ORP and pH values were achieved. These results suggest that IA with small aeration fraction and high air-on frequency should promote stable SND. The fluctuation range of the average level of ORP and the stability of the ORP and pH values may control the stability of SND process. In other experiments, a lower air-on frequency, that is, a longer air-on or air-off period, appeared to favor sequential nitrification and denitrification (SQND).