title: Modeling a granule-based anaerobic ammonium oxidizing (ANAMMOX) process.
abstract: A mathematical model was developed to describe the anaerobic ammonium oxidation (ANAMMOX) process in a granular upflow anaerobic sludge blanket (UASB) reactor. ANAMMOX granules were cultivated in the UASB reactor by seeding aerobic granules. The granule-based reactor had a great N-loading resistant capacity. The model simulation results on the 1-year reactor performance matched the experimental data well. The yield coefficient for the growth and the decay rate coefficient of the ANAMMOX granules were estimated to be 0.164 g COD g(-1) N and 0.00016 h(-1), respectively. With this model, the effects of process parameters on the reactor performance were evaluated. Results showed that the optimum granule diameter for the maximum N-removal should be between 1.0 and 1.3 mm and that the optimum N loading rate should be 0.8 kg N m(-3) d(-1). In addition, the substrate micro-profiles in the ANAMMOX granules were measured with a microelectrode to explore the diffusion dynamics within the granules, and the measured profiles matched the predicted results well.
authors.affiliation: Department of Chemistry, University of Science & Technology of China, Hefei, China.
authors.forename: Bing-Jie
authors.initials: BJ
authors.lastname: Ni
authors.forename: You-Peng
authors.initials: YP
authors.lastname: Chen
authors.forename: Shao-Yang
authors.initials: SY
authors.lastname: Liu
authors.forename: Fang
authors.initials: F
authors.lastname: Fang
authors.forename: Wen-Ming
authors.initials: WM
authors.lastname: Xie
authors.forename: Han-Qing
authors.initials: HQ
authors.lastname: Yu
mesh_terms: D000693:Anaerobiosis; D019149:Bioreactors; D008962:Models, Theoretical; D010084:Oxidation-Reduction; D000644:Quaternary Ammonium Compounds / Q000378:metabolism*; D012722:Sewage / Q000382:microbiology*
chemical_list: D000644:Quaternary Ammonium Compounds; D012722:Sewage