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Intermittent aeration and anammox nitrogen
Switching oxygen on and off kept anammox working while wiping out nitrite-oxidizing bacteria.
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What process was managed?
Partial nitritation–anammox (PNA) in a granule reactor.
Source: Efficient management of the nitritation-anammox microbiome through intermittent aeration: absence of the NOB guild and expansion and diversity of the NOx reducing guild suggests a highly reticulated nitrogen cycle · DOI · quote verified
How was oxygen supplied?
Intermittent aeration with increasing redox switches per cycle.
Source: Efficient management of the nitritation-anammox microbiome through intermittent aeration: absence of the NOB guild and expansion and diversity of the NOx reducing guild suggests a highly reticulated nitrogen cycle · DOI · quote verified
Early-phase TN removal?
86 ± 4% TN.
Source: Efficient management of the nitritation-anammox microbiome through intermittent aeration: absence of the NOB guild and expansion and diversity of the NOx reducing guild suggests a highly reticulated nitrogen cycle · DOI · quote verified
TN removal at highest switching?
75 ± 4%.
Source: Efficient management of the nitritation-anammox microbiome through intermittent aeration: absence of the NOB guild and expansion and diversity of the NOx reducing guild suggests a highly reticulated nitrogen cycle · DOI · quote verified
Were NOB abundant?
Extremely low Nitrobacter/Nitrospira; no autotrophic NOB MAGs recovered.
Source: Efficient management of the nitritation-anammox microbiome through intermittent aeration: absence of the NOB guild and expansion and diversity of the NOx reducing guild suggests a highly reticulated nitrogen cycle · DOI · quote verified
Dominant anammox and AOB taxa?
Brocadia spp. and Nitrosomonas spp.
Source: Efficient management of the nitritation-anammox microbiome through intermittent aeration: absence of the NOB guild and expansion and diversity of the NOx reducing guild suggests a highly reticulated nitrogen cycle · DOI · quote verified
How many MAGs?
55, covering about 79% of the metagenome.
Source: Efficient management of the nitritation-anammox microbiome through intermittent aeration: absence of the NOB guild and expansion and diversity of the NOx reducing guild suggests a highly reticulated nitrogen cycle · DOI · quote verified
AOB vs AnAOB community fractions?
About 13% AOB and 22% AnAOB.
Source: Efficient management of the nitritation-anammox microbiome through intermittent aeration: absence of the NOB guild and expansion and diversity of the NOx reducing guild suggests a highly reticulated nitrogen cycle · DOI · quote verified
Nitrate per ammonium removed?
R NatTot stayed below 0.13, consistent with anammox as the nitrate source.
Source: Efficient management of the nitritation-anammox microbiome through intermittent aeration: absence of the NOB guild and expansion and diversity of the NOx reducing guild suggests a highly reticulated nitrogen cycle · DOI · quote verified
Autotroph vs heterotroph MAG counts?
9 autotrophic vs 46 non-autotrophic MAGs despite no organic feed.
Source: Efficient management of the nitritation-anammox microbiome through intermittent aeration: absence of the NOB guild and expansion and diversity of the NOx reducing guild suggests a highly reticulated nitrogen cycle · DOI · quote verified
What does intermittent aeration achieve here?
Retention of AOB/AnAOB and control of NOB density.
Source: Efficient management of the nitritation-anammox microbiome through intermittent aeration: absence of the NOB guild and expansion and diversity of the NOx reducing guild suggests a highly reticulated nitrogen cycle · DOI · quote verified