Li Zhi-hua, Bai Xu-li, Zhang Qin, Liu Yi, He Chun-bo
Huan Jing Ke Xue. 2014 Sep;35(9):3492-7.
The endogenous process is an important metabolic part of the activated sludge, and the understanding of this process is still unclear. Characteristics of endogenous respiration for heterotrophic bacteria and autotrophic nitrifiers were analyzed using respirogram. Results showed that both heterotrophic and autotrophic bacteria entered the stage of endogenous respiration at almost the same time, but heterotrophic bacteria first entered the stage of dormancy i. e. , they were easier to recover a higher proportion of biomass during the dormancy stage, indicating that heterotrophic bacteria exhibited strong environmental adaptability. Autotrophic bacteria were, however, quite different. This finding confirmed that autotrophic bacteria were more vulnerable from the viewpoint of endogenous respiration. In addition, the study also found that the increase of endogenous respiration rate ratio reflected the decreased sludge activity. And the proportion of endogenous respiration was an important parameter to characterize the activity of activated sludge, which can be used as a quantitative index for the health status of activated sludge. The findings further deepened the understanding of endogenous respiration process and provided a theoretical basis for the operation and management of wastewater treatment plants.
内源过程是活性污泥重要的代谢部分，目前对该过程的认识仍不清晰。利用呼吸曲线分析了异养细菌和自养硝化菌的内源呼吸特性。结果表明，异养菌和自养菌几乎同时进入内源呼吸阶段，但异养菌先进入休眠阶段，即在休眠阶段它们更容易恢复较高比例的生物量，这表明异养菌表现出较强的环境适应性。然而，自养菌则大不相同。这一发现证实，从内源呼吸的角度来看，自养菌更易受到影响。此外，研究还发现，内源呼吸速率比的增加反映了污泥活性的降低。内源呼吸比例是表征活性污泥活性的一个重要参数，可作为活性污泥健康状况的定量指标。这些发现进一步加深了对内源呼吸过程的理解，为污水处理厂的运行管理提供了理论依据。
