The role of nitrite and free nitrous acid (FNA) in wastewater treatment plants
The role of nitrite and free nitrous acid (FNA) in wastewater treatment plants
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DOI：
10.1016/j.watres.2011.06.025
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发表时间：
2011-10-01
期刊：
影响因子：
12.8
通讯作者：
Ng, Wun Jern
中科院分区：
文献类型：
--
作者：
Zhou, Yan;Oehmen, Adrian;Ng, Wun Jern
已知在某些环境条件下，亚硝酸盐会在废水处理厂（WWTPs）中积累。亚硝酸盐的质子化形式——游离亚硝酸（FNA），已被发现在废水处理厂中对众多生物过程造成严重抑制。然而，FNA的这种抑制作用可能会被有益地利用，比如抑制亚硝酸盐氧化细菌（NOB）的生长，以通过亚硝酸盐捷径实现氮的去除。然而，FNA抑制NOB的阈值（约0.02毫克HNO₂ -N/升）可能也会抑制其他生物过程。本文综述了FNA对废水处理厂中所使用的微生物种群中的硝化细菌、反硝化细菌、厌氧氨氧化细菌、聚磷菌（PAO）、产甲烷菌和其他微生物的抑制作用。对FNA对微生物可能的抑制机制进行了讨论和比较。结论是，单一的抑制机制不足以解释FNA对微生物代谢的负面影响，FNA可产生多种抑制作用。综述表明，在FNA抑制机制能够更有效地用于优化废水处理厂生物过程之前，有必要进行进一步的研究。还讨论了研究方向的展望、研究结果如何可用于调控生物过程以及FNA对废水处理厂的总体影响。（C）2011爱思唯尔有限公司。保留所有权利。
Nitrite is known to accumulate in wastewater treatment plants (WWTPs) under certain environmental conditions. The protonated form of nitrite, free nitrous acid (FNA), has been found to cause severe inhibition to numerous bioprocesses at WWTPs. However, this inhibitory effect of FNA may possibly be gainfully exploited, such as repressing nitrite oxidizing bacteria (NOB) growth to achieve N removal via the nitrite shortcut. However, the inhibition threshold of FNA to repress NOB (similar to 0.02 mg HNO(2)-N/L) may also inhibit other bioprocesses. This paper reviews the inhibitory effects of FNA on nitrifiers, denitrifiers, anammox bacteria, phosphorus accumulating organisms (PAO), methanogens, and other microorganisms in populations used in WWTPs. The possible inhibition mechanisms of FNA on microorganisms are discussed and compared. It is concluded that a single inhibition mechanism is not sufficient to explain the negative impacts of FNA on microbial metabolisms and that multiple inhibitory effects can be generated from FNA. The review would suggest further research is necessary before the FNA inhibition mechanisms can be more effectively used to optimize WWTP bioprocesses. Perspectives on research directions, how the outcomes may be used to manipulate bioprocesses and the overall implications of FNA on WWTPs are also discussed. (C) 2011 Elsevier Ltd. All rights reserved.