Growth of lithotrophic ammonia-oxidizing bacteria on hydroxylamine

Böttcher, B.; Koops, Hans‐Peter

doi:10.1111/j.1574-6968.1994.tb07178.x

Cited by 29 publications

(12 citation statements)

References 16 publications

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“…Additionally, N. europaea is capable of growing mixotropically on ammonia and hydroxylamine. Under anoxic conditions, hydroxylamine is oxidized with nitrite as an electron acceptor, and nitrous oxide is produced . Therefore, during alternating loadings in the absence of oxygen, AOB are likely to be activated when using hydroxylamine and ammonia as substrates.…”

Section: Discussionmentioning

confidence: 99%

Insight into c-di-GMP Regulation in Anammox Aggregation in Response to Alternating Feed Loadings

Guo

Liu

Tang

et al. 2017

Environ. Sci. Technol.

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Substrate concentrations generally fluctuate in wastewaters. However, how anammox biomass behaves to overcome the stress of alternating feed loadings remains unclear. Here, we combined long-term reactor operation, batch tests, 16S rRNA transcript sequencing, and metabolomics analysis to investigate the aggregation of anammox biomass under the regulation of c-di-GMP, a key second messenger, in response to alternating feed loadings. We demonstrated that the aggregation process was significantly faster under alternating loadings and was significantly correlated with higher levels of c-di-GMP and extracellular polymeric substances (EPS) production. The increase in c-di-GMP was positively correlated with a higher relative transcript expression level in the c-di-GMP pathway-dependent community. The targeted metabolomics results indicated that the increased production of fructose 6-phosphate and UDP-N-acetyl-d-glucosamine, the precursor substances for the synthesis of exopolysaccharides, was induced by higher levels of c-di-GMP. Consequently, the granulation process was accelerated via EPS production. Higher levels of intracellular hydrophobic amino acids were also positively correlated with increased extracellular protein levels, considering the significant increase in peptides under alternating loadings. On the basis of our findings, we believe that c-di-GMP regulation and EPS production of the anammox biomass are important mechanisms to enhance its tolerance against unfavorable feed stress. These results highlight the role of c-di-GMP in anammox biomass as it works to survive in unfavorable niches.

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Section: Discussionmentioning

confidence: 99%

Insight into c-di-GMP Regulation in Anammox Aggregation in Response to Alternating Feed Loadings

Guo

Liu

Tang

et al. 2017

Environ. Sci. Technol.

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“…N. europaea are capable of growing mixotropically on ammonia and hydroxylamine. In the absence of oxygen, hydroxylamine was oxidized with nitrite as electron acceptor, while nitrous oxide was produced [22,23]. Under anoxic or oxygen-limited conditions, the oxygen source is unknown.…”

Section: Denitrifying Nitrifiersmentioning

confidence: 99%

Sustainable nitrogen elimination biotechnologies: A review

Ahn

2006

Process Biochemistry

555

245

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“… 13 The AOB denitrification pathway in both co- and counter-diffusion biofilms is largely stimulated by the diffusion of NH 2 OH into the anoxic region of the biofilm, where no oxygen would compete for the electrons generated by NH 2 OH oxidation with ( Figs 3 , 4 , 5 ). High N 2 O production rates in the presence of NH 2 OH and were also observed under anoxic conditions using suspended cultures 21 22 . The thicker biofilm generates higher N 2 O production is partly due to the extensive anoxic region for nitrite reduction ( Fig.…”

Section: Discussionmentioning

confidence: 73%

“…In order to fully clarify the interactions among N 2 O production, NH 2 OH and oxygen diffusion, and electron transportation by AOB in biofilms, the simulations in this work are performed based on the assumption that AOB are evenly distributed throughout the biofilm. It has been reported that AOB are able to grow on NH 2 OH oxidation and thus occupy an extended biofilm region 21 28 , while NOB are inhibited in the presence of NH 2 OH 29 30 . Nevertheless, further investigation is required to reveal the effect of diffusion geometry on N 2 O formation in more complex biofilms, where AOB, NOB, Anammox bacteria and/or heterotrophic organisms may co-exist and compete for substrates and growth space within the biofilm.…”

Section: Discussionmentioning

confidence: 99%

Nitrous Oxide Production in Co- Versus Counter-Diffusion Nitrifying Biofilms

Peng

Sun

Liu

et al. 2016

Sci Rep

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For the application of biofilm processes, a better understanding of nitrous oxide (N2O) formation within the biofilm is essential for design and operation of biofilm reactors with minimized N2O emissions. In this work, a previously established N2O model incorporating both ammonia oxidizing bacteria (AOB) denitrification and hydroxylamine (NH2OH) oxidation pathways is applied in two structurally different biofilm systems to assess the effects of co- and counter-diffusion on N2O production. It is demonstrated that the diffusion of NH2OH and oxygen within both types of biofilms would form an anoxic layer with the presence of NH2OH and nitrite ( ), which would result in a high N2O production via AOB denitrification pathway. As a result, AOB denitrification pathway is dominant over NH2OH oxidation pathway within the co- and counter-diffusion biofilms. In comparison, the co-diffusion biofilm may generate substantially higher N2O than the counter-diffusion biofilm due to the higher accumulation of NH2OH in co-diffusion biofilm, especially under the condition of high-strength ammonium influent (500 mg N/L), thick biofilm depth (300 μm) and moderate oxygen loading (~1–~4 m3/d). The effect of co- and counter-diffusion on N2O production from the AOB biofilm is minimal when treating low-strength nitrogenous wastewater.

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Growth of lithotrophic ammonia-oxidizing bacteria on hydroxylamine

Cited by 29 publications

References 16 publications

Insight into c-di-GMP Regulation in Anammox Aggregation in Response to Alternating Feed Loadings

Insight into c-di-GMP Regulation in Anammox Aggregation in Response to Alternating Feed Loadings

Sustainable nitrogen elimination biotechnologies: A review

Nitrous Oxide Production in Co- Versus Counter-Diffusion Nitrifying Biofilms

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