title: Nitrous oxide production during nitrification from organic solid waste under temperature and oxygen conditions.
abstract: Landfill aeration can accelerate the biological degradation of organic waste and reduce methane production; however, it induces nitrous oxide (N2O), a potent greenhouse gas. Nitrification is one of the pathways of N2O generation as a by-product during aerobic condition. This study was initiated to demonstrate the features of N2O production rate from organic solid waste during nitrification under three different temperatures (20°C, 30°C, and 40°C) and three oxygen concentrations (5%, 10%, and 20%) with high moisture content and high substrates' concentration. The experiment was carried out by batch experiment using Erlenmeyer flasks incubated in a shaking water bath for 72 h. A duplicate experiment was carried out in parallel, with addition of 100 Pa of acetylene as a nitrification inhibitor, to investigate nitrifiers' contribution to N2O production. The production rate of N2O ranged between 0.40 × 10(-3) and 1.14 × 10(-3) mg N/g-DM/h under the experimental conditions of this study. The rate of N2O production at 40°C was higher than at 20°C and 30°C. Nitrification was found to be the dominant pathway of N2O production. It was evaluated that optimization of O2 content is one of the crucial parameters in N2O production that may help to minimize greenhouse gas emissions and N turnover during aeration.
authors.affiliation: a Department of Urban and Environmental Engineering, Graduate School of Engineering , Kyushu University , Fukuoka , Japan.
authors.forename: Mitali
authors.initials: M
authors.lastname: Nag
authors.affiliation: b Department of Urban and Environmental Engineering, Faculty of Engineering , Kyushu University , Fukuoka , Japan.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Shimaoka
authors.affiliation: b Department of Urban and Environmental Engineering, Faculty of Engineering , Kyushu University , Fukuoka , Japan.
authors.forename: Teppei
authors.initials: T
authors.lastname: Komiya
mesh_terms: D000393:Air Pollutants / Q000378:metabolism*; D058465:Nitrification; D009609:Nitrous Oxide / Q000378:metabolism*; D010100:Oxygen; D062611:Solid Waste; D013696:Temperature
chemical_list: D000393:Air Pollutants; D062611:Solid Waste; D009609:Nitrous Oxide; D010100:Oxygen
keywords: Nitrous oxide; nitrification-denitrification; oxygen concentration; temperature