Intermittent aeration and anammox nitrogen
Switching oxygen on and off kept anammox working while wiping out nitrite-oxidizing bacteria.
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
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Intermittent aeration and anammox nitrogen
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55 MAGs were recovered.
A total of 55 metagenome-assembled genomes (MAGs)
What process was managed?
community performing the PNA process
What they did
Operated a partial nitritation–anammox granule reactor with rising redox-switch frequency and recovered 55 MAGs from monthly metagenomes.
What they found
TN removal stayed about 75–86%; NOB were essentially absent; AOB ~13% and anammox ~22% of the community; 79% of reads mapped to 55 MAGs.
The limits
What it doesn't show
Does not demonstrate the same NOB suppression in full-scale plants with real wastewater organics.
Key terms
- Anammox (AnAOB)
- Anaerobic ammonium-oxidizing bacteria.
- AOB
- Aerobic ammonia-oxidizing bacteria.
- NOB
- Nitrite-oxidizing bacteria that make nitrate.
- PNA
- Partial nitritation–anammox nitrogen removal.
- MAG
- Metagenome-assembled genome.
- Intermittent aeration
- Cycling oxygen on and off to steer the microbiome.
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MAGs recovered:
Common questions
How many MAGs?
55.
Early TN removal?
About 86 ± 4%.
Anammox share?
About 22% of the metagenome.
NOB outcome?
Canonical NOB essentially eliminated.
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