Vangsgaard, Anna Katrine1; Mutlu, Ayten Gizem3; Gernaey, Krist1; Smets, Barth F.3; Sin, Gürkan7
1 Department of Chemical and Biochemical Engineering, Technical University of Denmark2 Computer Aided Process Engineering Center, Department of Chemical and Biochemical Engineering, Technical University of Denmark3 Department of Environmental Engineering, Technical University of Denmark4 Urban Water Engineering, Department of Environmental Engineering, Technical University of Denmark5 Center for Process Engineering and Technology, Department of Chemical and Biochemical Engineering, Technical University of Denmark6 Environmental Chemistry, Department of Environmental Engineering, Technical University of Denmark7 Centre for oil and gas – DTU, Center, Technical University of Denmark
BACKGROUND: A validated model describing the nitritation-anammox process in a granular sequencing batch reactor (SBR) system is an important tool for: a) design of future experiments and b) prediction of process performance during optimization, while applying process control, or during system scale-up. RESULTS: A model was calibrated using a step-wise procedure customized for the specific needs of the system. The important steps in the procedure were initialization, steady-state and dynamic calibration, and validation. A fast and effective initialization approach was developed to approximate pseudo steady-state in the biofilm system. For oxygen mass transfer coefficient (kLa) estimation, long-term data, removal efficiencies, and the stoichiometry of the reactions were used. For the dynamic calibration a pragmatic model fitting approach was used - in this case an iterative Monte Carlo based screening of the parameter space proposed by Sin et al. (2008) - to find the best fit of the model to dynamic data. Finally, the calibrated model was validated with an independent data set. CONCLUSION: The presented calibration procedure is the first customized procedure for this type of system and is expected to contribute to achieve a fast and effective model calibration, an important enabling tool for various biochemical engineering design, control and operation problems.
Journal of Chemical Technology and Biotechnology, 2013, Vol 88, Issue 11, p. 2007-2015
Calibration and validation; Model fitting; Monte Carlo; Autotrophic nitrogen removal; Anammox; Sequencing batch reactors