| 游离氨(FA)耦合曝气时间对硝化菌活性的抑制影响 |
| 摘要点击 2683 全文点击 959 投稿时间：2015-09-24 修订日期：2015-11-04 |
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| 中文关键词 游离氨 曝气时间 亚硝酸盐积累率 硝化菌活性 |
| 英文关键词 free ammonia aeration length nitrite accumulation ratio activity of nitrifying bacteria |
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| 中文摘要 |
| 本试验采用3个标记为RAhead、RExact和RExceed的序批式反应器(SBR),在实现短程硝化的基础上,深入研究了游离氨(FA)耦合曝气时间对氨氧化菌(AOB)和亚硝酸盐氧化菌(NOB)活性的抑制影响. 本试验在3种FA浓度(0.5、5.1、10.1 mg ·L-1)耦合3种曝气时间(tExact:氨被完全氧化时停曝气; tAhead:氨被完全氧化前30 min停曝气; tExceed:氨被完全氧化后30 min停曝气)的条件下进行. 结果表明,当FA浓度达到10.1 mg ·L-1时,3种系统均实现了短程硝化,但短程硝化实现的快慢关系为:RAhead最快、RExact次之、RExceed最慢,其所需运行周期分别为56、62和72. 此外,3种系统中,相对于AOB,NOB活性受到的抑制作用更强,导致AOB活性始终高于NOB活性,且AOB和NOB菌属活性(η)强弱关系差异较大,AOB活性强弱关系:ηRExceed > ηRExact > ηRAhead,其值分别为104.4%、100%和85.8%,NOB活性强弱关系:ηRExceed > ηRExact > ηRAhead,其值分别为71.2%、64.9%和50.2%. |
| 英文摘要 |
| Three sequencing batch reactors (SBRs) labeled with RAhead, RExact and RExceed 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 (tExact: the time when ammonia oxidation was completed; tAhead: 30 min ahead of the time when ammonia oxidation was completed; tExceed: 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 RAhead > RExact > RExceed 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 ηRExact > ηRExceed > ηRAhead with the values of 104.4%, 100% and 85.8%, respectively. Nevertheless, the activity coefficients of NOB were in the order of ηRExceed > ηRExact > ηRAhead with the values of 71.2%, 64.9% and 50.2%, respectively. |
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