| 流态对生物添加强化硝化效果的影响 |
| 摘要点击 1355 全文点击 463 投稿时间：2017-04-27 修订日期：2017-05-16 |
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| 中文关键词 流态 硝化菌 生物添加 r/K-决策者 硝化性能 群落结构 |
| 英文关键词 flow pattern nitrifiers bioaugmentation r/K-strategists nitrification performance community structure |
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| 中文摘要 |
| 在15℃、相同氮负荷和添加强度条件下运行SBR和CSTR以对比分析两种典型流态（推流式和完全混合式）对硝化菌添加强化硝化效果的影响.结果表明，添加期间，SBR中氨氧化速率（AUR）和亚硝酸盐氧化速率（NUR）分别为添加前的2.34和2.39倍，停止添加后又分别降为添加前的2.01和1.78倍；添加期间CSTR中AUR和NUR分别为添加前的2.63和2.44倍，停止添加后又分别降为添加前的1.48和1.31倍.荧光原位杂交结果显示，添加期间，SBR中氨氧化菌（AOB）和亚硝酸盐氧化菌（NOB）的个数百分比分别为添加前的2.67和2.71倍，添加停止后，又分别降至原来的2.14和1.95倍； CSTR中AOB和NOB分别为添加前的2.91和1.77倍，但在添加停止后CSTR中AOB和NOB分别降至添加前的1.25和1.50倍.因此，硝化菌添加期间，两种流态的添加效果接近，但是在添加停止后，由于流态对硝化菌中K-决策者（Nitrosospira、Nitrospira）和r-决策者（Nitrosomonas europaea、Nitrobacter）的选择作用，添加的硝化菌在完全混合式条件下比推流式条件下更容易被系统淘汰. |
| 英文摘要 |
| A nitrifying sequencing batch reactor (SBR) and continuous stirred-tank reactor (CSTR) were operated at 15℃ under the same conditions to investigate the effect of two typical flow patterns (plug flow and complete mixing) on the efficiency of nitrification enhancement. The results show that, during bioaugmentation, the ammonia utilized rate(AUR)and nitrite utilized rate(NUR)in the SBR were 2.34 and 2.39 times of that before bioaugmentation, and after bioaugmentation ceased, the AUR and NUR slightly decreased to 2.01 and 1.78 times of that before bioaugmentation. Meanwhile, the AUR and NUR in the CSTR were 2.63 and 2.44 times that before bioaugmentation, and after bioaugmentation ceased, the AUR and NUR decreased to 1.48 and 1.31 times that before bioaugmentation. Fluorescence In-Situ Hybridization (FISH) results showed that during bioaugmentation, the ammonia oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) in the SBR were 2.67 and 2.71 times of that before bioaugmentation, and after bioaugmentation ceased, the AUR and NUR slightly decreased to 2.14 and 1.95 times that before bioaugmentation. Meanwhile, the AUR and NUR in the CSTR were 2.91 and 1.77 times of that before bioaugmentation, and after bioaugmentation ceased, the AUR and NUR decreased to 1.25 and 1.50 times of that before bioaugmentation. Therefore, the efficiency of nitrification enhancement was similar between the two types of flow patterns during bioaugmentation, but the seeded nitrifiers were much more vulnerable to wash out in the CSTR than that in the SBR due to r/K selectivity of the flow patterns. |
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