"Candidatus Brocadia anammoxidans" is a bacterial member of the phylum Planctomycetota and therefore lacks peptidoglycan in its cell wall, and has a compartmentalized cytoplasm.

[1] This process (dubbed the anammox-process) was discovered in the 1980s by the Gijs Kuenen lab in a waste water treatment plant in Delft, Netherlands.

The key enzyme involved in this reaction, hydroxylamine oxidoreductase, is located in an organelle-like structure called the anammoxosome.

The ability to oxidize ammonium anaerobically makes "Candidatus Brocadia anammoxidans" potentially useful for reducing—or eliminating—ammonium from waste water.

[3] The first full scale experiment employing the anammox process in the world was built in 2010 at the waste water treatment plant Dokhaven/Sluisjesdijk in Rotterdam, Netherlands.