Response of Different Nitrospira Species To Anoxic Periods Depends on Operational DO
Response of Different Nitrospira Species To Anoxic Periods Depends on Operational DO
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DOI：
10.1021/es404992g
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发表时间：
2014-03-04
影响因子：
11.4
通讯作者：
Lackner, Susanne
中科院分区：
文献类型：
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作者：
Gilbert, Eva M.;Agrawal, Shelesh;Lackner, Susanne
利用缺氧期后硝酸盐生产的滞后期是抑制亚硝酸盐氧化菌的一种很有前途的方法，这对部分亚硝化-厌氧氨氧化联合工艺的实施至关重要。在不同的温度和空气流速下，对短时间缺氧后硝酸盐生产的实际滞后阶段进行了深入研究。在监测的批量实验中，对四种不同的全规模部分硝化厌氧氨氧化植物的生物量进行了5-60分钟的缺氧处理。所产生的铵和亚硝酸盐存在于反应器条件下，使铵和亚硝酸盐同时氧化。缺氧时间超过15-20 min后，亚硝酸盐氧化的滞后期超过铵态氧化的滞后期。较低的温度减慢了转化率，但对滞后阶段没有影响。原生植物的操作氧浓度对滞后期的长度有很大影响，这可能与DGGE和测序分析检测到的硝基螺旋藻种类不同有关。
The exploitation of a lag phase in nitrate production after anoxic periods is a promising approach to suppress nitrite oxidizing bacteria, which is crucial for implementation of the combined partial nitritation-anammox process. An in-depth study of the actual lag phase in nitrate production after short anoxic periods was performed with varied temperatures and air flow rates. In monitored batch experiments, biomass from four different full-scale partial nitritation-anammox plants was subjected to anoxic periods of 5-60 min. Ammonium and the nitrite that was produced were present to reproduce reactor conditions and enable ammonium and nitrite oxidation at the same time. The lag phase observed in nitrite oxidation exceeded the lag phase in ammonium oxidation after anoxic periods of more than 15-20 min. Lower temperatures slowed down the conversion rates but did not affect the lag phases. The operational oxygen concentration in the originating full scale plants strongly affected the length of the lag phase, which could be attributed to different species of Nitrospira spp. detected by DGGE and sequencing analysis.