A Kinetic Expression for the Growth and Decay of Nitrite Oxidising Bacteria
A Kinetic Expression for the Growth and Decay of Nitrite Oxidising Bacteria
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DOI：
10.2521/jswtb.48.89
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
Bing Liu;Daisuke Naka;I. Jarvis
中科院分区：
文献类型：
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作者：
Bing Liu;Daisuke Naka;I. Jarvis
开发了两个新的函数来模拟亚硝酸氧化细菌(NOB)对氨部分亚硝化的抑制作用。当NOB短时间接触亚硝酸盐时，传统的非竞争性抑制率和竞争性抑制率表达式均可适用。另一方面，在持续超过2天的长期批量测试中，NOB的摄氧率(OUR)似乎在最初的几个小时内就恢复了。这种恢复被认为是NOB生长阶段存在的冲击负荷的适应现象。在一个峰值后，OUR不断下降，这是由于中毒加速了腐烂。在对现有的活性污泥模型(ASM)进行改进的基础上，提出了一个新的数学模型来描述污泥的生长恢复和中毒衰减。该模型考虑了Monod型生长过程的含时适应函数和衰变过程的一级中毒函数。所建立的模型可以根据不同的初始亚硝酸盐浓度(125-2000 mg-N/L)再现不同形状的批次OUR曲线。
Two functions were newly developed to model the inhibition of nitrite oxidising bacteria (NOB) for partial nitritation of ammonia to nitrite. Traditional non-competitive and competitive inhibition rate expressions could be applied when NOB were exposed to nitrite for short period of time. On the other hand, in long-term batch tests lasting for over 2 days, it appeared that NOB’s oxygen uptake rate (OUR) recovered within the initial few hours. This recovery was thought to be an adaptation phenomenon from the shock loading that existed on the growth stage of NOB. Upon a peak value, the OUR decreased continuously and this was attributed to poisoning that contributed to the acceleration of decay. To express the growth recovery and the poisoning decay, a new mathematical model was elaborated based on the modification of an existing Activated Sludge Model (ASM). In the model a time-dependent adaptation function on the Monod-type growth process and an additional first-order poisoning function on the decay process were included. The developed model could reproduce the batch OUR curves having various shapes depending on different initial nitrite concentrations (125–2,000 mg-N/ l ).