TY - JOUR
T1 - Effects of dissolved oxygen and pH on nitrous oxide production rates in autotrophic partial nitrification granules
AU - Rathnayake, Rathnayake M.L.D.
AU - Oshiki, Mamoru
AU - Ishii, Satoshi
AU - Segawa, Takahiro
AU - Satoh, Hisashi
AU - Okabe, Satoshi
N1 - Publisher Copyright:
© 2015 Elsevier Ltd.
PY - 2015/12/1
Y1 - 2015/12/1
N2 - The effects of dissolved oxygen (DO) and pH on nitrous oxide (N2O) production rates and pathways in autotrophic partial nitrification (PN) granules were investigated at the granular level. N2O was primarily produced by betaproteobacterial ammonia-oxidizing bacteria, mainly Nitrosomonas europaea, in the oxic surface layer (<200μm) of the autotrophic PN granules. N2O production increased with increasing bulk DO concentration owing to activation of the ammonia (i.e., hydroxylamine) oxidation in this layer. The highest N2O emissions were observed at pH 7.5, although the ammonia oxidation rate was unchanged between pH 6.5 and 8.5. Overall, the results of this study suggest that in situ analyses of PN granules are essential to gaining insight into N2O emission mechanisms in a granule.
AB - The effects of dissolved oxygen (DO) and pH on nitrous oxide (N2O) production rates and pathways in autotrophic partial nitrification (PN) granules were investigated at the granular level. N2O was primarily produced by betaproteobacterial ammonia-oxidizing bacteria, mainly Nitrosomonas europaea, in the oxic surface layer (<200μm) of the autotrophic PN granules. N2O production increased with increasing bulk DO concentration owing to activation of the ammonia (i.e., hydroxylamine) oxidation in this layer. The highest N2O emissions were observed at pH 7.5, although the ammonia oxidation rate was unchanged between pH 6.5 and 8.5. Overall, the results of this study suggest that in situ analyses of PN granules are essential to gaining insight into N2O emission mechanisms in a granule.
KW - 16S rRNA gene deep sequencing
KW - Autotrophic partial nitrification granule
KW - Dissolved oxygen effect
KW - NO emissions
KW - NO microsensor
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U2 - 10.1016/j.biortech.2015.08.054
DO - 10.1016/j.biortech.2015.08.054
M3 - Article
C2 - 26318242
AN - SCOPUS:84940052656
SN - 0960-8524
VL - 197
SP - 15
EP - 22
JO - Bioresource Technology
JF - Bioresource Technology
ER -