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首页> 外文期刊>Archives of microbiology >High rate of aerobic nitrification and denitrification by Nitrosomonas eutropha grown in a fermentor with complete biomass retention in the presence of gaseous NO2 or NO
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High rate of aerobic nitrification and denitrification by Nitrosomonas eutropha grown in a fermentor with complete biomass retention in the presence of gaseous NO2 or NO

机译：在存在气态NO2或NO的情况下，在发酵罐中生长的富营养亚硝化单胞菌的有氧硝化和反硝化率很高，并且生物质完全保留

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A pure culture of the obligately lithoautotrophic ammonia-oxidizer Nitrosomonas eutropha was grown in a laboratory-scale bioreactor with complete biomass retention. The air supply was supplemented with nitrogen dioxide (NO2; 25 or 50 ppm) or nitric oxide (NO; 25 or 50 ppm). Compared to cultures grown without these nitrogenous oxides, the addition of NO2 or NO to the culture resulted in a significant increase of the nitrification rate, specific activity of ammonia oxidation, growth rate, and maximum cell densities. In contrast, the growth yield slightly decreased in the presence of NO or NO2. Maximum cell densities of about 2 x 10(10) cells ml(-1) and a maximum nitrification rate of about 221 mmol NH4+ 1(-1) dau(-1) were obtained after 3 weeks in the presence of 50 ppm NO2. Furthermore, in the stationary phase about 50% of the nitrite produced was aerobically denitrified to dinitrogen (N-2) and traces of nitrous oxide (N2O) When cells were supplemented with NO, a high rate of aerobic denitrification occurred only during the first days of the exponential growth phase. [References: 32]
机译：在实验室规模的生物反应器中，将专心地自养的氨氧化型富营养硝化亚硝化单胞菌的纯培养物完全保留下来。空气供应中补充了二氧化氮（NO2; 25或50 ppm）或一氧化氮（NO; 25或50 ppm）。与不含这些一氧化二氮的培养物相比，向培养物中添加NO2或NO导致硝化速率，氨氧化比活，生长速率和最大细胞密度显着提高。相反，在NO或NO 2存在下，生长产量略有下降。在50 ppm NO2存在3周后，获得的最大细胞密度约为2 x 10（10）个细胞ml（-1），最大硝化速率约为221 mmol NH4 + 1（-1）dau（-1）。此外，在固定相中，产生的亚硝酸盐中约有50％需氧反硝化为二氮（N-2）和微量的一氧化二氮（N2O）。当细胞中添加NO时，仅在开始的几天内，有氧反硝化率很高指数增长阶段。 [参考：32]

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