Transformations of ammonia and the environmental impact of nitrifying bacteria

Abeliovich, Aharon

doi:10.1007/bf00129087

Cited by 31 publications

(9 citation statements)

References 82 publications

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“…The only known pathway to gain energy was assumed to be aerobic oxidation of ammonia to nitrite. However, the appearance of aerobic nitrifiers in anoxic environments [1,2] indicated that AOB are more versatile than previously assumed. It was discovered that Nitrosomonas eutropha could also use nitrite as electron acceptor, which was observed under three conditions: (i) hydrogen-dependent denitrification, (ii) anoxic ammonia oxidation with NO 2 [3] and (iii) NO x -induced aerobic ammonia oxidation.…”

Section: Introductionmentioning

confidence: 81%

Role of nitrogen oxides in the metabolism of ammonia-oxidizing bacteria

Kampschreur

Tan

Picioreanu

et al. 2006

Biochemical Society Transactions

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Ammonia-oxidizing bacteria (AOB) can use oxygen and nitrite as electron acceptors. Nitrite reduction by Nitrosomonas is observed under three conditions: (i) hydrogen-dependent denitrification, (ii) anoxic ammonia oxidation with nitrogen dioxide (NO(2)) and (iii) NO(x)-induced aerobic ammonia oxidation. NO(x) molecules play an important role in the conversion of ammonia and nitrite by AOB. Absence of nitric oxide (NO), which is generally detectable during ammonia oxidation, severely impairs ammonia oxidation by AOB. The lag phase of recovery of aerobic ammonia oxidation was significantly reduced by NO(2) addition. Acetylene inhibition tests showed that NO(2)-dependent and oxygen-dependent ammonia oxidation can be distinguished. Addition of NO(x) increased specific activity of ammonia oxidation, growth rate and denitrification capacity. Together, these findings resulted in a hypothetical model on the role of NO(x) in ammonia oxidation: the NO(x) cycle.

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Section: Introductionmentioning

confidence: 81%

Role of nitrogen oxides in the metabolism of ammonia-oxidizing bacteria

Kampschreur

Tan

Picioreanu

et al. 2006

Biochemical Society Transactions

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“…The quantitative and qualitative biases can be avoided by the use of in situ techniques. The fluorescent antibody (FA) technique has been developed to overcome the limitations with culture dependent methods (Abeliovich 1992). In this technique, antibodies were labelled to detect the targeted organisms.…”

Section: Introductionmentioning

confidence: 99%

In situ characterization of nitrifiers in an activated sludge plant: detection of Nitrobacter Spp.

Coşkuner

Curtis

2002

J Appl Microbiol

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Aims: The purpose of this work was to investigate microbial ecology of nitrifiers at the genus level in a typical full-scale activated sludge plant. Methods and Results: Grab samples of mixed liquor were collected from a plug-flow reactor receiving domestic wastewater. Fluorescent in situ hybridization technique (FISH) was used to characterize both ammonia oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) in combination with Confocal Scanning Laser Microscope (CSLM). Fluorescently labelled, 16S rRNA-targeted oligonucleotide probes were used in this study. Both Nitrosomonas and Nitrosospira genera as AOB and Nitrobacter and Nitrospira genera as NOB were sought with genus specific probes Nsm156, Nsv443 and NIT3 and NSR1156, respectively. Conclusions: It was shown that Nitrosospira genus was dominant in the activated sludge system studied, although Nitrosomonas is usually assumed to be the dominant genus. At the same time, Nitrobacter genus was detected in activated sludge samples. Significance and Impact of the Study: Previous studies based on laboratory scale pilot plants employing synthetic wastewater suggested that only Nitrospira are found in wastewater treatment plants. We have shown that Nitrobacter genus might also be present. We think that these kinds of studies may not give a valid indication of the microbial diversity of the real fullscale plants fed with domestic wastewater.

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“…Another environmental factor believed to have a detrimental effect on nitrification is sunlight. In wastewater reservoirs during summer months, a phenomenon of unbalanced nitrification frequently is observed, leading to accumulation of nitrite (Abeliovich, 1992). However, the increase of nitrification observed during the higher solar radiation periods (mean values of approximately 200 6 70 W/m 2 for the period June through August during both summers 2009 and 2010) and the absence of nitrite accumulation indicated that light was not a major inhibiting factor in our pond system, in contrast to what was reported for a wastewater reservoir in Israel (Kaplan et al, 2000).…”

Section: Resultsmentioning

confidence: 99%

Inhibition of Nitrification by Low Oxygen Concentrations in an Aerated Treatment Pond System with Biofilm Promoting Mats

Jechalke¹,

Rosell²,

Vogt³

et al. 2011

Water Environment Research

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Inhibition of nitrification in the presence of low oxygen concentrations (below 1.2 mg/L) and temperature dependency at oxygen saturation levels were observed in an aerated treatment pond system with biofilm promoting mats in two parallel ponds for remediation of ammonium, methyl tertiary butyl ether (MTBE), and benzene-contaminated groundwater. Within the first 18 months, at an average oxygen concentration of 0.7 ± 0.5 mg/L along the ponds, no significant decrease of ammonium or significant formation of nitrification products were observed. After increasing the aeration to oxygen saturation levels, the ammonium removal increased up to a maximum of 27%, with concomitant formation of nitrite and nitrate (up to 26 and 0.6 mM). The subsequent reduction of aeration in one pond to the previous level resulted in a definitive stop of nitrification, while, in the other pond, nitrification was well-correlated with the water temperature, reaching up to 45% ammonium removal. Water Environ. Res., 83, 622 (2011).

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Transformations of ammonia and the environmental impact of nitrifying bacteria

Cited by 31 publications

References 82 publications

Role of nitrogen oxides in the metabolism of ammonia-oxidizing bacteria

Role of nitrogen oxides in the metabolism of ammonia-oxidizing bacteria

In situ characterization of nitrifiers in an activated sludge plant: detection of Nitrobacter Spp.

Inhibition of Nitrification by Low Oxygen Concentrations in an Aerated Treatment Pond System with Biofilm Promoting Mats

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