Chao Y.-N.Lin J.-H.Ng K.-K.Wu C.-H.Hong P.-K.A.Lin C.-F.2019-05-212019-05-2120142731223https://www.scopus.com/inward/record.uri?eid=2-s2.0-84899417330&doi=10.2166%2fwst.2014.053&partnerID=40&md5=691a64ae77301957539b0841937b1fffhttps://scholars.lib.ntu.edu.tw/handle/123456789/409500This study presented a method to upgrade existing aeration tanks to remove total nitrogen (TN). Bioplates carrying entrapped biomass were installed in an aeration basin to create anoxic/anaerobic zones where denitrification can proceed. In a reactor that coupled bioplates containing entrapped biomass (equivalent to as high as 7,500 mg/L of biomass) and an activated sludge suspension (at mixed liquor suspended solids of 1,300-2,400 mg/L), nitrification efficiency exceeded 95% for an influent wastewater containing 21-54 mg/L of NH3-N. In all cases amended with alkalinity and with or without added methanol as an electron source, TN removal was between 60 and 70%. The results demonstrated anoxic/oxic or anaerobic/anoxic/oxic processes could be incorporated in a conventional aeration basin, requiring no substantial modifications of the vessel and operation, and thus providing improved treatment in terms of nitrogen removal in the conventional suspendedgrowth process. © IWA Publishing 2014.Activated sludge process; Anaerobic; Anoxic; Bioplates; Entrapped biomass; Total nitrogen removal[SDGs]SDG6Activated sludge process; Suspensions (fluids); Activated sludge; Anaerobic; Anaerobic/anoxic/oxic process; Anoxic; Bioplates; Influent wastewaters; Mixed liquor suspended solids; Total nitrogen removal; Biomass; methanol; nitrogen; nitrogen; activated sludge; aeration; alkalinity; anoxic conditions; biomass; denitrification; electron; methanol; nitrogen; pollutant removal; activated sludge; alkalinity; article; biomass; bioreactor; denitrification; electron; nitrification; suspended particulate matter; waste component removal; waste water; biomass; devices; isolation and purification; water management; Biomass; Bioreactors; Denitrification; Nitrification; Nitrogen; Water Purificationjournal article10.2166/wst.2014.053247183512-s2.0-84899417330