title: Nitrogen removal performance and loading capacity of a novel single-stage nitritation-anammox system with syntrophic micro-granules.
abstract: The operation performance of a novel micro-granule based syntrophic system of nitritation and anammox was studied by controlling the oxygen concentration and maintaining a constant temperature of 25°C. With the oxygen concentration of around 0.11 (<0.15)mg/L, the single-stage nitritation-anammox system was startup successfully at a nitrogen loading rate (NLR) of 1.5kgN/m3/d. The reactor was successfully operated at volumetric N loadings ranging from 0.5 to 2.5kgN/m3/d with a high nitrogen removal of 82%. The microbial community was composed by ammonia oxidizing bacteria (AOB) and anammox bacteria forming micro-granules with an average diameter of 0.8mm and good settleability. Results from pyrosequencing analysis revealed that Ca. Kuenenia and Nitrosomonas were selected and enriched in the community over the startup period, and these were identified as the dominant anammox bacteria and AOB species, respectively.
authors.affiliation: School of Environmental and Municipal Engineering, Tianjin Chengjian University, 26# Jinjing Road, Tianjin 300384, China; Tianjin Key Laboratory of Aquatic Science and Technology, 26# Jinjing Road, Tianjin 300384, China.
authors.forename: Shaopo
authors.initials: S
authors.lastname: Wang
authors.affiliation: Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan; State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Liu
authors.affiliation: School of Environmental Science and Engineering, Shandong University, 27# Shanda South Road, Jinan 250100, China.
authors.forename: Qigui
authors.initials: Q
authors.lastname: Niu
authors.affiliation: Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan.
authors.forename: Jiayuan
authors.initials: J
authors.lastname: Ji
authors.affiliation: Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan.
authors.forename: Toshimasa
authors.initials: T
authors.lastname: Hojo
authors.affiliation: Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan. Electronic address: gyokuyu.ri.a5@tohoku.ac.jp.
authors.forename: Yu-You
authors.initials: YY
authors.lastname: Li
mesh_terms: D001419:Bacteria; D019149:Bioreactors / Q000382:microbiology*; D058440:Denitrification; D009584:Nitrogen; D009606:Nitrosomonas
chemical_list: D009584:Nitrogen
keywords: Ca. Kuenenia; Nitrogen loading rate; Nitrogen removal; Single-stage nitritation-anammox; Syntrophic micro-granule