title: Startup and oxygen concentration effects in a continuous granular mixed flow autotrophic nitrogen removal reactor.
abstract: The startup and performance of the completely autotrophic nitrogen removal over nitrite (CANON) process was tested in a continuously fed granular bubble column reactor (BCR) with two different aeration strategies: controlling the oxygen volumetric flow and oxygen concentration. During the startup with the control of oxygen volumetric flow, the air volume was adjusted to 60mL/h and the CANON reactor had volumetric N loadings ranging from 7.35 to 100.90mgN/Ld with 36-71% total nitrogen removal and high instability. In the second stage, the reactor was operated at oxygen concentrations of 0.6, 0.4 and 0.2mg/L. The best condition was 0.2 mgO2/L with a total nitrogen removal of 75.36% with a CANON reactor activity of 0.1149gN/gVVSd and high stability. The feasibility and effectiveness of CANON processes with oxygen control was demonstrated, showing an alternative design tool for efficiently removing nitrogen species.
authors.affiliation: Departamento de Ingeniería Química, Universidad de Concepción, Casilla 160 C Correo 3, Concepción, Chile.
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Varas
authors.affiliation: Departamento de Ingeniería Química, Universidad de Concepción, Casilla 160 C Correo 3, Concepción, Chile.
authors.forename: Víctor
authors.initials: V
authors.lastname: Guzmán-Fierro
authors.affiliation: Departamento de Ingeniería Química, Universidad de Concepción, Casilla 160 C Correo 3, Concepción, Chile.
authors.forename: Elisa
authors.initials: E
authors.lastname: Giustinianovich
authors.affiliation: Departamento de Ingeniería Química, Universidad de Concepción, Casilla 160 C Correo 3, Concepción, Chile.
authors.forename: Jack
authors.initials: J
authors.lastname: Behar
authors.affiliation: Departamento de Ingeniería Química, Universidad de Concepción, Casilla 160 C Correo 3, Concepción, Chile.
authors.forename: Katherina
authors.initials: K
authors.lastname: Fernández
authors.affiliation: Departamento de Ingeniería Química, Universidad de Concepción, Casilla 160 C Correo 3, Concepción, Chile. Electronic address: mroeckel@udec.cl.
authors.forename: Marlene
authors.initials: M
authors.lastname: Roeckel
mesh_terms: D064751:Ammonium Compounds / Q000378:metabolism*; D061249:Batch Cell Culture Techniques / Q000295:instrumentation*; D019149:Bioreactors / Q000382:microbiology*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D009573:Nitrites / Q000378:metabolism; D009584:Nitrogen / Q000302:isolation & purification / Q000378:metabolism*; D010100:Oxygen / Q000378:metabolism*; D010101:Oxygen Consumption / Q000502:physiology; D012212:Rheology / Q000295:instrumentation*
chemical_list: D064751:Ammonium Compounds; D009573:Nitrites; D009584:Nitrogen; D010100:Oxygen
keywords: Anammox; Autotrophic nitrogen removal; CANON; Oxygen effect