间歇曝气模式对同步硝化反硝化稳定性的影响

在不同间歇曝气(IA)模式下.采用序批式活性污泥法(SBR)处理模拟低碳城市污水.并考察了ORP和pH值的变化规律与同步硝化反硝化(SND)持续稳定性之间的关系.结果表明,在曝气百分数(AF)为0.5和高曝气频率(fIA)的间歇曝气模式下,TN去除率为92%,ORP均值均化程度最好,ORP和pH值的稳定性最强.因此,低曝气百分数和高曝气频率的间歇曝气模式有利于SND过程的持续稳定,且ORP均值的均化程度与ORP和pH值的稳定性可控制SND过程的稳定性.另外,低曝气频率的间歇曝气模式有利于顺序式硝化反硝化(SQND)的发生.

Influence of intermittent aeration on the stability of simultaneous nitrification and denitrification

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).