Department of Chemical Engineering, Escola d'Enginyeria, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Spain.
Bioresour Technol. 2011 Nov;102(21):9870-5. doi: 10.1016/j.biortech.2011.08.008. Epub 2011 Aug 10.
The starvation process of a high-rate partial nitrification system during 30 days and its controlled recovery were studied in an activated sludge pilot plant. Four ammonium-starved reactors under anoxic, aerobic and two different alternating aerobic/anoxic conditions were evaluated. The highest and the lowest decay rates of ammonia oxidizing bacteria (AOB) were obtained under full aerobic (0.24 d(-1)) and full anoxic (0.11 d(-1)) conditions, respectively. The evolution of biomass activity correlated well with the AOB quantification using FISH technique. AOB fractions lower than 1% were measured in the four reactors after 23 days of starvation. The recovery of the system was achieved in only 5 days using a nitrogen loading rate (NLR) control loop, obtaining the same conditions than before the long-term starvation period with a NLR of 1.2 g N L(-1)d(-1) and 98% of nitrite accumulation in the effluent.
在一个活性污泥中试系统中研究了高负荷部分硝化系统在 30 天内的饥饿过程及其控制恢复。评估了在缺氧、好氧和两种不同交替好氧/缺氧条件下的四个氨饥饿反应器。在完全好氧（0.24 d(-1))和完全缺氧（0.11 d(-1))条件下，氨氧化菌（AOB）的衰减率最高和最低。使用 FISH 技术对 AOB 进行定量，生物量活性的演变与 AOB 很好地相关。在饥饿 23 天后，四个反应器中的 AOB 分数均低于 1%。仅使用氮负荷率（NLR）控制回路 5 天即可实现系统的恢复，获得与长期饥饿期之前相同的条件，NLR 为 1.2 g N L(-1)d(-1)，并且 98%的亚硝酸盐在流出物中积累。
