title: Mainstream wastewater treatment in integrated fixed film activated sludge (IFAS) reactor by partial nitritation/anammox process.
abstract: In this study the system based on the combination of biofilm and activated sludge (IFAS - integrated fixed film activated sludge) was tested and compared with a system that relies only on biofilm (MBBR - moving bed biofilm reactor) for nitrogen removal from municipal wastewater by deammonification process. By introduction of suspended biomass into MBBR the nitrogen removal efficiency increased from 36 ± 3% to 70 ± 4% with simultaneous 3-fold increase of nitrogen removal rate. Results of batch tests and continuous reactor operation showed that organotrophic nitrate reduction to nitrite, followed by anammox reaction contributed to this high removal efficiency. After sCOD/NH4-N ratio decreased from 1.8 ± 0.2 to 1.3 ± 0.1 removal efficiency decreased to 52 ± 4%, while still maintaining 150% higher removal rate, comparing to MBBR. Activity tests revealed that affinity of NOB to oxygen is higher than affinity of AOB with half-saturation constants of 0.05 and 0.41 mg/L, respectively.
authors.affiliation: Department of Sustainable Development, Environmental Science and Engineering, Royal Institute of Technology (KTH), Teknikringen 76, 100-44 Stockholm, Sweden. Electronic address: andriym@kth.se.
authors.forename: Andriy
authors.initials: A
authors.lastname: Malovanyy
authors.affiliation: Department of Sustainable Development, Environmental Science and Engineering, Royal Institute of Technology (KTH), Teknikringen 76, 100-44 Stockholm, Sweden; IVL Swedish Environmental Institute, Valhallavägen 81, 114 28 Stockholm, Sweden.
authors.forename: Jozef
authors.initials: J
authors.lastname: Trela
authors.affiliation: Department of Sustainable Development, Environmental Science and Engineering, Royal Institute of Technology (KTH), Teknikringen 76, 100-44 Stockholm, Sweden.
authors.forename: Elzbieta
authors.initials: E
authors.lastname: Plaza
mesh_terms: D000641:Ammonia / Q000737:chemistry / Q000378:metabolism; D018441:Biofilms; D057919:Biological Oxygen Demand Analysis; D018533:Biomass; D019149:Bioreactors / Q000382:microbiology; D058440:Denitrification; D004867:Equipment Design; D009573:Nitrites / Q000378:metabolism; D009584:Nitrogen / Q000302:isolation & purification / Q000378:metabolism; D010100:Oxygen / Q000378:metabolism; D012722:Sewage; D014865:Waste Disposal, Fluid / Q000295:instrumentation* / Q000379:methods*; D062065:Wastewater / Q000737:chemistry
chemical_list: D000641:Ammonia; D009573:Nitrites; D009584:Nitrogen; D010100:Oxygen; D012722:Sewage; D062065:Wastewater
keywords: Anammox; Deammonification; IFAS; MBBR; Mainstream