title: Nitrification and microbiological evolution during aerobic treatment of municipal solid wastes.
abstract: Nitrification is a key step in the nitrogen cycle in various ecosystems. In this study, the nitrogen dynamic and the evolution of groups of microorganisms were studied during aerobic treatment of fine organic fraction of municipal solid wastes. Mineralization of organic nitrogen exhibited two phases and resulted in two ammonia emissions peaks. The nitrogen balance indicated the onset of nitrification only during the maturation stage, which was confirmed by the accumulations of both nitrite and nitrate and the nitrous oxide emissions in this period. A significant development of ammonia-oxidizing bacteria correlated to the onset of nitrification. On the contrary, ammonia-oxidizing archaea were less abundant and declined through treatment. Identification of these ammonia oxidizers indicates that the Nitrosomonas europaea/eutropha-like ammonia oxidizing bacteria were responsible for ammonia oxidation instead of other groups of ammonia oxidizers during aerobic treatment of fine organic fraction of municipal solid wastes.
authors.affiliation: Irstea, UR GERE, 17 Avenue de Cucillé, CS 64427, F-35044 Rennes Cedex, France. yang.zeng@cemagref.fr
authors.forename: Yang
authors.initials: Y
authors.lastname: Zeng
authors.forename: Amaury
authors.initials: A
authors.lastname: De Guardia
authors.forename: Christine
authors.initials: C
authors.lastname: Ziebal
authors.forename: Flávia Junqueira
authors.initials: FJ
authors.lastname: De Macedo
authors.forename: Patrick
authors.initials: P
authors.lastname: Dabert
mesh_terms: D000332:Aerobiosis; D000641:Ammonia / Q000378:metabolism; D001419:Bacteria / Q000235:genetics / Q000378:metabolism*; D058465:Nitrification; D010084:Oxidation-Reduction; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D060888:Real-Time Polymerase Chain Reaction; D012037:Refuse Disposal
chemical_list: D012336:RNA, Ribosomal, 16S; D000641:Ammonia