title: Modeling of simultaneous denitrification--anaerobic digestion--organic matter aerobic oxidation and nitrification in an anoxic-anaerobic-aerobic compact filter reactor.
abstract: A mathematical model was developed for a compact anoxic-anaerobic-aerobic filter reactor with liquid recirculation for the treatment of fishing effluents. The model includes denitrification, anaerobic digestion, aerobic carbon oxidation and nitrification steps, as well as an evaluation of the liquid gas mass transfer and pH. The model was calibrated using one experimental condition at a recycling ratio (R)=10, and was validated with R equal to 2 and 0, with an organic concentration of 554±24 mg TOCL(-1), salinity of 24 g L(-1) and hydraulic retention time (HRT) of 2 d. Carbon total removal is higher than 98%, while maximum nitrogen removal is 62% using total nitrification in the aerobic zone, due to a higher quantity of NO(x) produced which were recirculated to the anoxic zone. In the aerobic zone, simultaneous nitrification and denitrification processes occur, because the diffusion limitations cause a low oxygen penetration in the biofilm. In the anoxic-anaerobic zone, denitrification or methanogenesis inhibition by DO (caused by the recycled oxygen) is not observed.
authors.affiliation: Departamento de Ingeniería Química, Facultad de Ingeniería, Universidad de Concepción, PO Box 4070386, Concepción, Chile.
authors.forename: Jaime
authors.initials: J
authors.lastname: Moya
authors.forename: César
authors.initials: C
authors.lastname: Huiliñir
authors.forename: Karol
authors.initials: K
authors.lastname: Peredo
authors.forename: Estrella
authors.initials: E
authors.lastname: Aspé
authors.forename: Marlene
authors.initials: M
authors.lastname: Roeckel
mesh_terms: D019149:Bioreactors / Q000382:microbiology*; D003198:Computer Simulation; D017076:Computer-Aided Design; D058440:Denitrification / Q000502:physiology; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008954:Models, Biological; D058465:Nitrification / Q000502:physiology; D009930:Organic Chemicals / Q000378:metabolism*; D010084:Oxidation-Reduction; D000644:Quaternary Ammonium Compounds / Q000302:isolation & purification / Q000378:metabolism*; D014462:Ultrafiltration / Q000295:instrumentation*; D018508:Water Purification / Q000295:instrumentation*
chemical_list: D009930:Organic Chemicals; D000644:Quaternary Ammonium Compounds