title: A unified model of ammonium oxidation rate at various initial ammonium strength and active ammonium oxidizer concentrations.
abstract: This paper attempts to provide insight into the biological ammonium oxidation process applied to high-strength ammonium wastewater treatment. The ammonium oxidation process has been investigated at various ammonium and biomass concentrations. Using the oxygen uptake rate (OUR) method, a proportion of both active ammonium oxidizers (AAO) and nitrite oxidizers to the total suspended solids were separately estimated, and then tested to normalize the ammonium oxidation rate at various ammonium strengths and AAO concentrations. High-ammonium strength showed no significant inhibition to ammonium oxidation due to high-AAO concentration. It was demonstrated that the key factor deciding the specific ammonium oxidation rate was the ratio of ammonium concentration to the active nitrifiers (AN) concentration, but not the sole-variable such as initial ammonium concentration and AN concentration. Contois model was screened to suitably fit the ammonium oxidation kinetics under the high-ammonium loading condition, resulting in a half-saturation constant of 0.028 mg N mg(-1) AAO and a maximum specific ammonium oxidation rate of 3.56 g N g(-1)AAO d(-1).
authors.affiliation: Ulsan Eco Center, Korea Industrial Complex Corporation, Republic of Korea.
authors.forename: Jung-Hoon
authors.initials: JH
authors.lastname: Kim
authors.forename: Xuejun
authors.initials: X
authors.lastname: Guo
authors.forename: Shishir Kumar
authors.initials: SK
authors.lastname: Behera
authors.forename: Hung-Suck
authors.initials: HS
authors.lastname: Park
mesh_terms: D000064:Acclimatization / Q000187:drug effects; D052818:Autotrophic Processes / Q000187:drug effects; D018533:Biomass; D007700:Kinetics; D008956:Models, Chemical; D009584:Nitrogen / Q000378:metabolism; D010084:Oxidation-Reduction / Q000187:drug effects; D010100:Oxygen / Q000378:metabolism; D000644:Quaternary Ammonium Compounds / Q000378:metabolism* / Q000494:pharmacology*; D012044:Regression Analysis; D013997:Time Factors
chemical_list: D000644:Quaternary Ammonium Compounds; D009584:Nitrogen; D010100:Oxygen