title: Wastewater treatment and nitrogen removal using submerged filter systems.
abstract: The performance of two submerged filter systems: a two filters-in-series system and a single combined filter system, in treating a strong nitrogenous wastewater with nitrogen concentration of 480 mg/L was evaluated. Both systems were equally effective in removing up to 90% of nitrogen and 98% of COD from the wastewater for loading rates up to 5 kg COD/m3.d and 0.5 kg N/m3.d. The second system in which anaerobic, anoxic, and aerobic zones were incorporated in a single filter offers a greater flexibility in treatment in that by repositioning the locations of the aeration point and effluent recycling inlet, the zonal volumes can be altered easily to treat wastewaters with different COD and nitrogen concentrations.
authors.affiliation: School of Civil and Structural Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798.
authors.forename: P C
authors.initials: PC
authors.lastname: Chui
authors.forename: Y
authors.initials: Y
authors.lastname: Terashima
authors.forename: J H
authors.initials: JH
authors.lastname: Tay
authors.forename: H
authors.initials: H
authors.lastname: Ozaki
mesh_terms: D001421:Bacteria, Anaerobic / Q000502:physiology; D018441:Biofilms; D018533:Biomass; D000860:Hypoxia; D009584:Nitrogen / Q000378:metabolism*; D010100:Oxygen / Q000378:metabolism; D014865:Waste Disposal, Fluid
chemical_list: D009584:Nitrogen; D010100:Oxygen