短程脱氮中不同分段进水模式下氧化亚氮产量

摘要

The production of N2O of domestic sewage with different step-feeding modes was inspected during shortcut biological nitrogen removal. Sequencing batch reactor was used in the experiment and the aeration was controlled at 60 L/h. The results show that N2O is mainly produced in the nitrification stage; the accumulation of NO2 decreases along with the increase of steps. The N2O output increasing order with different feeding modes is as follows one-step influent, two-step influent, and three-step influent. The reason is that ammonia-oxidizing bacteria used nitrite as electron acceptors and reducing hydrogen or ammonia as electron donors for aerobic denitrification.%利用SBR反应器,控制曝气量为60 L/h,考察实际生活污水在不同分段进水模式下短程脱氮过程中N2O的产量.结果表明:N2O主要产生在硝化阶段；随着分段进水段数的增加,NO2-的积累减少.不同进水方式下SBR短程脱氮N2O产量不同,3种进水方式N2O产量由小到大顺序为:3次进水,2次进水,1次进水.其原因是由于氨氧化细菌(AOB)主要是以NO2-为电子受体,以还原性氢或者氨为电子供体进行好氧反硝化.