title: Determine the operational boundary of a pilot-scale single-stage partial nitritation/anammox system with granular sludge.
abstract: The partial nitritation/anammox (PN/A) process has been applied to ammonium-rich wastewater treatment, but the operational boundary has not been well determined for long-term stability. This pilot-scale study was targeted at a single-stage PN/A process using a sequencing batch reactor (SBR) (volume: 53 m(3)) and granulated activated sludge. The maximum nitrogen removal rate reached 0.83 kg N/(m(3)·d). Microbial analysis suggested that ammonium oxidizing bacteria were mainly present in small sludge flocs while anammox bacteria were prone to grow in large sludge granules. The PN/A performance was enhanced when dissolved oxygen (DO) was increased from 0.25 to 0.76 mg/L, and deteriorated at DO higher than 1.15 mg/L. The PN/A was inhibited at free ammonia (FA) over 77.0 mg/L. High DO or FA concentrations inhibited anammox activity and further induced high and inhibitory nitrite concentrations. Therefore, appropriate DO and FA concentrations should be controlled to achieve single-stage PN/A in SBRs.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China E-mail: pyz@bjut.edu.cn.
authors.forename: Yandong
authors.initials: Y
authors.lastname: Yang
authors.affiliation: Beijing Drainage Group Co. Ltd (BDG), Beijing 100022, China.
authors.forename: Liang
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Beijing Drainage Group Co. Ltd (BDG), Beijing 100022, China.
authors.forename: Xiaoyu
authors.initials: X
authors.lastname: Han
authors.affiliation: Beijing Drainage Group Co. Ltd (BDG), Beijing 100022, China.
authors.forename: Shujun
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China; Department of Civil and Environmental Engineering, University of Connecticut, Storrs, CT 06269, USA.
authors.forename: Baikun
authors.initials: B
authors.lastname: Li
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China E-mail: pyz@bjut.edu.cn; Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China.
authors.forename: Yongzhen
authors.initials: Y
authors.lastname: Peng
mesh_terms: D000641:Ammonia; D064751:Ammonium Compounds / Q000737:chemistry / Q000378:metabolism*; D000693:Anaerobiosis; D001419:Bacteria / Q000378:metabolism; D019149:Bioreactors / Q000382:microbiology; D009584:Nitrogen / Q000737:chemistry / Q000378:metabolism*; D010865:Pilot Projects; D012722:Sewage / Q000737:chemistry*; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry
chemical_list: D000641:Ammonia; D064751:Ammonium Compounds; D009584:Nitrogen; D012722:Sewage; D062065:Wastewater; D014874:Water Pollutants, Chemical