游离氨冲击抑制联合污泥停留时间控制实现高效短程硝化

Free ammonia shock suppression combined with sludge retention time control to achieve high-efficiency short-cut nitrification

维持活性污泥系统中氨氧化菌(AOB)活性的同时抑制亚硝酸盐氧化菌(NOB)活性是实现短程硝化的关键,为此提出了一种游离氨(FA)冲击抑制联合污泥停留时间(SRT)控制实现高效持久短程硝化的方法。虽然FA冲击抑制仅1 d就能实现短程硝化快速启动,但是仍然无法长期维持短程硝化。进一步控制SRT分别为10、20 d进行实验发现,SRT为20 d效果更佳,能够实现高效持久的短程硝化。高通量测序结果反映出FA冲击抑制联合SRT控制后,亚硝化单胞菌属(Nitrosomonas)始终占优势是高氨氧化效能的重要原因。

Maintaining the activity of ammonia-oxidizing bacteria(AOB)while inhibiting the activity of nitrite-oxidizing bacteria(NOB)in the activated sludge system is the key to achieve short-cut nitrification.Therefore,a method of free ammonia(FA)shock suppression combined with sludge retention time(SRT)control was put forward to achieve efficient and consistent short-cut nitrification.Only FA shock suppression for 1 d could achieve rapid start of short-cut nitrification,but could not maintain for long term.Then,the SRT was controlled at 10 and 20 d,and the result showed that SRT of 20 d was better to achieve efficient and consistent short-cut nitrification.The high-throughput results reflected that FA shock suppression combined with SRT control achived efficient ammonia oxidation because Nitrosomonas occupied the dominant position all the time.