| 间歇曝气对硝化菌生长动力学影响及NO-2积累机制 |
| 摘要点击 3348 全文点击 1735 投稿时间：2008-01-29 修订日期：2008-05-06 |
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| 中文关键词 短程硝化 动力学 间歇曝气 亚硝酸盐（NO-2） |
| 英文关键词 shortcut nitrification dynamics intermittent aeration nitrite (NO-2) |
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| 中文摘要 |
| 采用间歇曝气方法处理低氨氮浓度生活污水，在SRT 10、 5、 2.5和1.25 d条件下，SBR反应器出水中NO-2含量（以N计，下同）为18、 19、 14和5 mg/Ｌ，积累率达到73%、 85%、 91%和78%，而连续曝气SBR仅为14%、 21%、 31%和34%；同时氨氮去除率维持在97%、 95%、 76%和39%，与连续曝气SBR的92%、 97%、 71%和47%相当.对硝化菌的生长动力学分析表明，在间歇曝气硝化系统中，氨氧化菌（AOB）可以通过产率系数（YAOB）的增加来提高自身在反应器中的绝对生物量，并补偿因间歇曝气引起的比底物利用速率下降，从而使比增殖速率（μm）和NH+4的氧化速率不变.与此相反，亚硝酸盐氧化菌（NOB）却不具备这种补偿特性，导致其μm和对NO-2氧化速率降低，引起了NO-2在出水中积累. |
| 英文摘要 |
| In order to investigate shortcut nitrification, an intermittent-aeration SBR was employed to treat the domestic wastewater containing low concentration of NH+4. The results shows that under the SRTs of 10, 5, 2.5 and 1.25 d, NO-2 produced in effluent were built up to 18, 19, 14 and 5 mg/L, respectively, with accumulation ratio of 73%, 85%, 91% and 78% respectively. As to the continuous-aeration SBR, however, the NO-2 accumulation ratios were only 14%, 21%, 31% and 34%. In addition, the corresponding removals of NH+4 in the intermittent-aeration SBR were maintained at a comparable level in contrast to those for the continuous-aeration SBR, i.e., 97%, 95%, 76% and 39% vs 92%, 97%, 71% and 47%. By exploring the growth kinetics of nitrifiers, ammonia-oxidizing bacteria (AOB) in the intermittent-aeration system was capable of increasing its biomass in the reactor by an elevation in growth yield (YAOB), which as a result compensated the decreased specific substrate utilization rate at low DO level and further led to the unchanged μm value and NH+4 oxidation rate. On the contrary, nitrite-oxidizin bacteria (NOB) was lack of the function of compensability, and it hence lowered the μm value and NO-2 oxidation rate, and therefore resulted in an accumulation of NO-2 in the effluent. |
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