title: Nitrate reduction by organotrophic Anammox bacteria in a nitritation/anammox granular sludge and a moving bed biofilm reactor.
abstract: The effects of volatile fatty acids (VFAs) on nitrogen removal and microbial community structure in nitritation/anammox process were compared within a granular sludge reactor and a moving bed biofilm reactor. Nitrate productions in both systems were lower by 40-68% in comparison with expected nitrate production. Expected sludge production on VFAs was estimated to be 67-77% higher if heterotrophs were the main acetate degraders suggesting that Anammox bacteria used its organotrophic capability and successfully competed with general heterotrophs for organic carbon, which led to a reduced sludge production. FISH measurements showed a population consisting of mainly Anammox and AOB in both reactors and oxygen uptake rate (OUR) tests also confirmed that flocculent biomass consisted of a minor proportion of heterotrophs with a large proportion of AOBs. The dominant Anammox bacterium was Candidatus "Brocadia fulgida" with a minor fraction of Candidatus "Anammoxoglobus propionicus", both known to be capable of oxidizing VFAs.
authors.affiliation: Delft University of Technology, Department of Biotechnology, Julianalaan 65, 2628 BC Delft, The Netherlands.
authors.forename: Mari K H
authors.initials: MK
authors.lastname: Winkler
authors.forename: Jingjing
authors.initials: J
authors.lastname: Yang
authors.forename: Robbert
authors.initials: R
authors.lastname: Kleerebezem
authors.forename: Elzbieta
authors.initials: E
authors.lastname: Plaza
authors.forename: Jozef
authors.initials: J
authors.lastname: Trela
authors.forename: Bengt
authors.initials: B
authors.lastname: Hultman
authors.forename: Mark C M
authors.initials: MC
authors.lastname: van Loosdrecht
mesh_terms: D001421:Bacteria, Anaerobic / Q000145:classification / Q000378:metabolism*; D018441:Biofilms / Q000254:growth & development*; D019149:Bioreactors / Q000382:microbiology*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D009038:Motion; D009566:Nitrates / Q000302:isolation & purification / Q000378:metabolism*; D000644:Quaternary Ammonium Compounds / Q000302:isolation & purification / Q000378:metabolism*; D012037:Refuse Disposal / Q000379:methods*; D012722:Sewage / Q000382:microbiology*
chemical_list: D009566:Nitrates; D000644:Quaternary Ammonium Compounds; D012722:Sewage