title: Nitric oxide for anammox recovery in a nitrite-inhibited deammonification system.
abstract: The anaerobic ammonium oxidation (anammox) process is widely used for N-rich wastewater treatment. In the current research the deammonification reactor in a reverse order (first anammox, then the nitrifying biofilm cultivation) was started up with a high maximum N removal rate (1.4 g N m(-2) d(-1)) in a moving bed biofilm reactor. Cultivated biofilm total nitrogen removal rates were accelerated the most by anammox intermediate - nitric oxide (optimum 58 mg NO-N L(-1)) addition. Furthermore, NO was added in order to eliminate inhibition caused by nitrite concentrations (>50 mg [Formula: see text]) increasing [Formula: see text] (2/1, respectively) along with a higher ratio of [Formula: see text] (0.6/1, respectively) than stoichiometrical for this optimal NO amount added during batch tests. Planctomycetales clone P4 sequences, which was the closest (98% and 99% similarity, respectively) relative to Candidatus Brocadia fulgida sequences quantities increase to 1 × 10(6) anammox gene copies g(-1) total suspended solids to till day 650 were determined by quantitative polymerase chain reaction.
authors.affiliation: a Institute of Chemistry, University of Tartu , 14a Ravila St., 50411 Tartu , Estonia.
authors.forename: Ivar
authors.initials: I
authors.lastname: Zekker
authors.forename: Ergo
authors.initials: E
authors.lastname: Rikmann
authors.forename: Toomas
authors.initials: T
authors.lastname: Tenno
authors.forename: Liis
authors.initials: L
authors.lastname: Loorits
authors.forename: Kristel
authors.initials: K
authors.lastname: Kroon
authors.forename: Hannu
authors.initials: H
authors.lastname: Fritze
authors.forename: Tero
authors.initials: T
authors.lastname: Tuomivirta
authors.forename: Priit
authors.initials: P
authors.lastname: Vabamäe
authors.forename: Markus
authors.initials: M
authors.lastname: Raudkivi
authors.forename: Anni
authors.initials: A
authors.lastname: Mandel
authors.forename: Sergio S C
authors.initials: SS
authors.lastname: Dc Rubin
authors.forename: Taavo
authors.initials: T
authors.lastname: Tenno
mesh_terms: D064751:Ammonium Compounds / Q000378:metabolism*; D000693:Anaerobiosis; D018441:Biofilms; D019149:Bioreactors; D009569:Nitric Oxide / Q000378:metabolism*; D009573:Nitrites / Q000378:metabolism*; D010084:Oxidation-Reduction; D061328:Planctomycetales / Q000502:physiology*
chemical_list: D064751:Ammonium Compounds; D009573:Nitrites; D009569:Nitric Oxide
keywords: deammonification; digester; intermittent aeration; nitrite inhibition