利用OUR监测不同SRT下有机物去除与硝化的分界点

为深入了解有机物与氨氮的降解规律，对活性污泥法改进及新兴脱氮技术应用提供技术支持，研究了有机物去除段与硝化段分离的过程和机理，探讨了不同污泥龄对该过程的影响，并加入呼吸速率（OUR）这一新指标。结果表明，在各污泥龄下，有机物去除和硝化是分步进行的，先进行有机物的去除，当有机物进入慢速降解或难降解阶段时，才进入硝化阶段。污泥龄越小，两个过程的分离越明显。10、17.5和35 d污泥龄下有机物对氨氮的临界抑制浓度分别为36、72和96 mg·L-1。DO和OUR均可表征该分离过程。OUR作为表示活性污泥活性的指标，在实际分离应用中更有意义。

Monitoring separation point between organic removal and nitrification under different SRT by OUR

This study investigated separation processes and mechanisms of organic removal and nitrification, in order to clarify organic and ammonia degradation rules, provide technical support for improvement of activated sludge, and enable application of growing denitrification technologies. We also discuss the influence of different SRTs on the process and add OUR as a new indicator. Results suggest that organic removal and nitrification take place step by step under any SRT conditions, with organic removal occurring first, followed by nitrification. The smaller the SRT, the clearer the separation between the two processes. The organic critical inhibition concentrations for ammonia with SRTs of 10 d, 17.5 d, and 35 d were 36 mg·L-1, 72 mg·L-1, and 96 mg·L-1, respectively. DO and OUR can serve to characterize this process. However, as an indicator of activated sludge activity, OUR is more significant during the actual separation process.