title: Nitrogen removal in a fluidized bed bioreactor by using mixed culture under oxygen-limited conditions.
abstract: Nitrogen removal involving nitrification and denitrification was investigated in a fluidized bed bioreactor by using mixed culture sludge under oxygen-limited conditions. Methane was used as a sole carbon source for denitrification. In this study, optimal nitrification and denitrification rates were examined by varying methane and oxygen gas dissolution flow rates, 90 ml/min, 400 ml/min and 650 ml/min, in each. Simultaneously nitrification and denitrification was achieved. The total nitrogen removal rate was 15-mg N/g VSS. d, 21-mg N/g VSS. d and 26.4-mg N/g VSS. d at gas dissolution flow rate 90 ml/min, 400 ml/min and 650 ml/min, respectively. No significant accumulation of nitrite was found in this experiment. Nitrogen removal rates depend on gas dissolution flow rates. DO concentration was at 0.5-2 mg/L.
authors.affiliation: Environmental Engineering and Management, School of Environment, Resources and Development, Asian Institute of Technology, Kloung Luang, Pathumthani 12120, Thailand.
authors.forename: T
authors.initials: T
authors.lastname: Khin
authors.forename: A P
authors.initials: AP
authors.lastname: Annachhatre
mesh_terms: D019149:Bioreactors; D002244:Carbon / Q000302:isolation & purification; D008697:Methane / Q000737:chemistry; D009573:Nitrites / Q000737:chemistry / Q000378:metabolism; D009584:Nitrogen / Q000302:isolation & purification*; D010100:Oxygen / Q000737:chemistry / Q000378:metabolism*; D000644:Quaternary Ammonium Compounds / Q000302:isolation & purification; D012722:Sewage / Q000737:chemistry / Q000382:microbiology; D014865:Waste Disposal, Fluid / Q000379:methods*; D014872:Water Movements; D018508:Water Purification
chemical_list: D009573:Nitrites; D000644:Quaternary Ammonium Compounds; D012722:Sewage; D002244:Carbon; D009584:Nitrogen; D008697:Methane; D010100:Oxygen