title: Organic carbon and nitrogen removal from a strong wastewater using a denitrifying suspended growth reactor and a horizontal-flow biofilm reactor.
abstract: Recirculation of fully nitrified effluent from a laboratory horizontal-flow biofilm reactor (HFBR) to a mixed pre-denitrification reactor (DR) was used to remove organic carbon and nitrogen from synthetic dairy wastewater. Three recirculation ratios of 2, 4, and 6 were examined in this study and the average filtered chemical oxygen demand (CODf) and total nitrogen (TN) removals were up to 97.4% and 85.5%, respectively, at 11 degrees C. In the DR, the nitrate nitrogen removal efficiencies and rates were 86-96% and 22-34 g N/m3 d. In the HFBR, the ammonium nitrogen removal rates were 293-337 mg N/m2 d.
authors.affiliation: Department of Civil Engineering, National University of Ireland, Galway, Ireland. liwen.xiao@nuigalway.ie
authors.forename: L W
authors.initials: LW
authors.lastname: Xiao
authors.forename: M
authors.initials: M
authors.lastname: Rodgers
authors.forename: J
authors.initials: J
authors.lastname: Mulqueen
mesh_terms: D018441:Biofilms; D002244:Carbon / Q000302:isolation & purification*; D007220:Industrial Waste; D009584:Nitrogen / Q000302:isolation & purification*; D014867:Water / Q000737:chemistry*
chemical_list: D007220:Industrial Waste; D014867:Water; D002244:Carbon; D009584:Nitrogen