Sun Hong-wei, Lü Xin-tao, Wei Xue-fen, Zhao Hua-nan, Ma Juan, Fang Xiao-hang
Huan Jing Ke Xue. 2016 Mar 15;37(3):1075-81.
Three sequencing batch reactors (SBRs) labeled with R(Ahead), R(Exact) and R(Exceed) were employed to investigate the synergetic inhibition effect of free ammonia (FA) and length of aeration phase on the activity of ammonia-oxidizing bacteria ( AOB) and nitrite- oxidizing bacteria (NOB) after shortcut nitritation was achieved in the systems. The experiments were conducted under the conditions of three FA concentrations (0.5, 5. 1, 10.1 mg · L⁻¹) combined with three kinds of aeration time (t(Exact): the time when ammonia oxidation was completed; t(Ahead): 30 min ahead of the time when ammonia oxidation was completed; t(Exceed): 30 min exceeded when the time ammonia oxidation was completed). It was found that short-cut nitrification could be successfully established in three reactors with a FA level of 10.1 mg · L⁻¹. Meanwhile, the speed of achieving nitritation was in the sequence of R(Ahead) > R(Exact) > R(Exceed) with operational cycles of 56, 62 and 72, respectively. Compared to AOB, NOB in the three reactors was observed to be more sensitive to FA, resulting in AOB activity higher than NOB activity throughout the whole experimental period. Moreover, there was great difference in the activity coefficient ( η) between AOB and NOB. The activity coefficients of AOB were in the order of η(RExact) > η(RExceed) > η(RAhead) with the values of 104.4%, 100% and 85.8%, respectively. Nevertheless, the activity coefficients of NOB were in the order of η(RExceed) > η(RExact) > η(RAhead) with the values of 71.2%, 64.9% and 50.2%, respectively.
使用三个分别标记为R(Ahead)、R(Exact)和R(Exceed)的序批式反应器（SBR），研究系统实现短程硝化后，游离氨（FA）和曝气阶段时长对氨氧化细菌（AOB）和亚硝酸盐氧化细菌（NOB）活性的协同抑制作用。实验在三种FA浓度（0.5、5.1、10.1mg·L⁻¹）与三种曝气时间（t(Exact)：氨氧化完成时的时间；t(Ahead)：氨氧化完成时间提前30分钟；t(Exceed)：氨氧化完成时间超出30分钟）的条件下进行。结果发现，在FA水平为10.1mg·L⁻¹时，三个反应器均能成功实现短程硝化。同时，实现亚硝化的速度顺序为R(Ahead) > R(Exact) > R(Exceed)，运行周期分别为56、62和72。与AOB相比，三个反应器中的NOB对FA更敏感，导致在整个实验期间AOB活性高于NOB活性。此外，AOB和NOB的活性系数（η）存在很大差异。AOB的活性系数顺序为η(RExact) > η(RExceed) > η(RAhead)，值分别为104.4%、100%和85.8%。然而，NOB的活性系数顺序为η(RExceed) > η(RExact) > η(RAhead)，值分别为71.2%、64.9%和50.2%。
