title: Performance of autotrophic nitrogen removal in the granular sludge bed reactor.
abstract: The autotrophic nitrogen removal process in the granular sludge bed reactor (GSB-ANR process) is a new and promising biotechnology for nitrogen removal from wastewater, which requires single reactor, simple operation and inorganic carbon. The results showed that the GSB-ANR process could be successfully started up with nitrifying granular sludge as inoculum. The volumetric nitrogen loading rate and the volumetric nitrogen removal rate reached 5.44 and 2.57kgNm(-3)day(-1), respectively, which were significantly higher than the level reported for the autotrophic nitrogen removal processes in single reactor. The predominant functional microorganisms were from Planctomycetes and Nitrosomonas. The excellent performance of GSB-ANR process was ascribed to: (a) The high activities of aerobic ammonia-oxidizing bacteria (AOB) and anaerobic ammonium oxidation (ANAMMOX) bacteria; (b) the good settlability of the granular sludge; (c) the suitable DO concentration that satisfied the oxygen requirement of AOB and prevented ANAMMOX bacteria from oxygen inhibition.
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.
authors.forename: Lan
authors.initials: L
authors.lastname: Wang
authors.forename: Ping
authors.initials: P
authors.lastname: Zheng
authors.forename: Tingting
authors.initials: T
authors.lastname: Chen
authors.forename: Jianwei
authors.initials: J
authors.lastname: Chen
authors.forename: Yajuan
authors.initials: Y
authors.lastname: Xing
authors.forename: Qixing
authors.initials: Q
authors.lastname: Ji
authors.forename: Meng
authors.initials: M
authors.lastname: Zhang
authors.forename: Jiqiang
authors.initials: J
authors.lastname: Zhang
mesh_terms: D052818:Autotrophic Processes; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology*; D009584:Nitrogen / Q000032:analysis / Q000302:isolation & purification*; D009606:Nitrosomonas / Q000378:metabolism; D010084:Oxidation-Reduction; D010100:Oxygen / Q000032:analysis; D010316:Particle Size; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012212:Rheology; D012722:Sewage / Q000382:microbiology*; D012995:Solubility; D013997:Time Factors
chemical_list: D012336:RNA, Ribosomal, 16S; D012722:Sewage; D009584:Nitrogen; D010100:Oxygen