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- W2045804223 abstract "Autotrophic ammonia oxidizing bacteria (AOB) are capable of generating nitrous oxide (N 2 O), via nitrite reduction, in oxygen-limited environments. The recognition of the environmental fate and effects of N 2 O, as a greenhouse gas has prompted researchers to study N 2 O generation and emission control in wastewater treatment systems. Oxygen, often expressed in terms of the bioreactor liquid dissolved oxygen concentration, is generally viewed as the most important variable with respect to influencing N 2 O generation. However, some literature data suggest that the nitrite concentration may also influence AOB N 2 O generation under oxygen-limited conditions, although there are contradictions in the reported information. This paper presents the findings of an investigation that specifically examined the sensitivity of aerobic-phase biomass N 2 O generation to changes in bioreactor nitrite concentration, via supply of exogenous nitrite, as well as changes in nitrous acid concentration through mixed liquor pH manipulation, in a bench-scale wastewater treatment bioreactor. The data demonstrate the significant influence of nitrite availability on biomass N 2 O generation in the studied system. Most of the collected data suggest that nitrous acid, as opposed to nitrite proper, was the actual AOB nitrite reductase (NiR) electron acceptor, based on observed N 2 O generation. In this case, the bioreactor mixed liquor pH, as well as nitrite concentration, would be important with respect to AOB N 2 O generation and greenhouse gas emissions. Key words: ammonia oxidation, autotrophic denitrification, nitrite reduction, nitrous oxide." @default.
- W2045804223 created "2016-06-24" @default.
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- W2045804223 date "2006-07-01" @default.
- W2045804223 modified "2023-10-16" @default.
- W2045804223 title "The influence of nitrite and pH (nitrous acid) on aerobic-phase, autotrophic N<sub>2</sub>O generation in a wastewater treatment bioreactor" @default.
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- W2045804223 doi "https://doi.org/10.1139/s05-034" @default.
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