title: Improvement of biological nitrogen removal with nitrate-dependent Fe(II) oxidation bacterium Aquabacterium parvum B6 in an up-flow bioreactor for wastewater treatment.
abstract: Aquabacterium parvum strain B6 exhibited efficient nitrate-dependent Fe(II) oxidation ability using nitrate as an electron acceptor. A continuous up-flow bioreactor that included an aerobic and an anoxic section was constructed, and strain B6 was added to the bioreactor as inocula to explore the application of microbial nitrate-dependent Fe(II) oxidizing (NDFO) efficiency in wastewater treatment. The maximum NRE (anoxic section) and TNRE of 46.9% and 79.7%, respectively, could be obtained at a C/N ratio of 5.3:1 in the influent with HRT of 17. Meanwhile, the taxonomy composition of the reactor was assessed, as well. The NDFO metabolism of strain B6 could be expected because of its relatively dominant position in the anoxic section, whereas potential heterotrophic nitrification and aerobic denitrification developed into the prevailing status in the aerobic section after 50days of continuous operation.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China; Department of Environmental Microbiology, Technical University of Berlin, Berlin 10587, Germany.
authors.forename: Xiaoxin
authors.initials: X
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Ang
authors.initials: A
authors.lastname: Li
authors.affiliation: Department of Environmental Microbiology, Technical University of Berlin, Berlin 10587, Germany.
authors.forename: Ulrich
authors.initials: U
authors.lastname: Szewzyk
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China. Electronic address: mafang@hit.edu.cn.
authors.forename: Fang
authors.initials: F
authors.lastname: Ma
mesh_terms: D000693:Anaerobiosis; D020562:Betaproteobacteria / Q000378:metabolism*; D019149:Bioreactors / Q000382:microbiology*; D058440:Denitrification; D005296:Ferrous Compounds; D052836:Heterotrophic Processes; D007501:Iron / Q000378:metabolism*; D009566:Nitrates / Q000378:metabolism; D058465:Nitrification; D009584:Nitrogen / Q000378:metabolism; D017672:Nitrogen Compounds / Q000302:isolation & purification*; D009589:Nitrogen Oxides; D010084:Oxidation-Reduction; D062065:Wastewater; D018508:Water Purification
chemical_list: D005296:Ferrous Compounds; D007501:Iron; D009566:Nitrates; D009584:Nitrogen; D017672:Nitrogen Compounds; D009589:Nitrogen Oxides; D062065:Wastewater
keywords: Biological nitrogen removal; Microbial community; Nitrate-dependent Fe(II) oxidation; Up-flow reactor