title: Nitrate removal by nitrate-dependent Fe(II) oxidation in an upflow denitrifying biofilm reactor.
abstract: A continuous upflow biofilm reactor packed with ceramsite was constructed for nitrate removal under an anaerobic atmosphere without an organic carbon source. Denitrifying bacteria, Pseudomonas sp. W1, Pseudomonas sp. W2 and Microbacterium sp. W5, were added to the bioreactor as inocula. Nitrate concentration, nitrite accumulation and nitrogen removal efficiency in the effluent were investigated under various conditions set by several parameters including pH, hydraulic retention time (HRT), ratios of carbon to nitrogen (C/N) and temperature. The results illustrated that the maximum removal efficiency of nitrogen was 85.39%, under optimum reaction parameters, approximately pH 6.5-7, HRT = 48 hours and C/N = 13.1:1 at temperature of 30 °C, which were determined by experiment.
authors.affiliation: School of Civil Engineering, Wuhan University, Wuhan 430072, China E-mail: kaiyangchn@126.com.
authors.forename: Jun
authors.initials: J
authors.lastname: Zhou
authors.affiliation: School of Civil Engineering, Wuhan University, Wuhan 430072, China E-mail: kaiyangchn@126.com.
authors.forename: Hongyu
authors.initials: H
authors.lastname: Wang
authors.affiliation: School of Civil Engineering, Wuhan University, Wuhan 430072, China E-mail: kaiyangchn@126.com.
authors.forename: Kai
authors.initials: K
authors.lastname: Yang
authors.affiliation: Northeast Electric Power Design Institute, Changchun 130000, China.
authors.forename: Yuchong
authors.initials: Y
authors.lastname: Sun
authors.affiliation: Central and Southern China Municipal Engineering Design and Research Institute, Wuhan 430010, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Tian
mesh_terms: D001419:Bacteria / Q000145:classification / Q000378:metabolism; D018441:Biofilms; D019149:Bioreactors / Q000382:microbiology*; D058440:Denitrification; D005296:Ferrous Compounds; D009566:Nitrates / Q000737:chemistry / Q000378:metabolism*; D009573:Nitrites; D009584:Nitrogen / Q000032:analysis; D010084:Oxidation-Reduction
chemical_list: D005296:Ferrous Compounds; D009566:Nitrates; D009573:Nitrites; D009584:Nitrogen