Kinetic analysis via mathematical modeling for ferrous iron oxidation in a class of SBR-type system

doi:10.1016/j.cjche.2019.04.014

Abstract

Abstract: This paper analyses the oxidation of ferrous iron via chemical and biological means in a class of Sequential Batch Reactors (SBR-type). For this, a kinetic model for the study of iron oxidation system is proposed, followed by a parametric sensitivity analysis and a bifurcation analysis, which allow selecting the most influential kinetic parameters in order to ensure a suitable prediction capacity of the mathematical structure. The system consists of two SBR bioreactors, the first being used to produce hydrogen peroxide (H₂O₂) that is fed to a second reactor where the iron oxidation is carried out by chemical-biological processes. Model predictions were compared with experimental data for the production of H₂O₂ and for ferrous iron oxidation, finding suitable correlation coefficients (r²> 0.98) for each state variable. The bifurcation analysis showed the trajectories of the main variables, such as, biomass, H₂O₂ and ferrous iron, under the change of the most influential kinetic parameters. This analysis demonstrates the usefulness of the constructed model to predict the kinetic behaviour of the SBR-type process.

Key words: Bifurcation analysis, Hydrogen peroxide, Iron oxidation, Modeling, Simulation

摘要： This paper analyses the oxidation of ferrous iron via chemical and biological means in a class of Sequential Batch Reactors (SBR-type). For this, a kinetic model for the study of iron oxidation system is proposed, followed by a parametric sensitivity analysis and a bifurcation analysis, which allow selecting the most influential kinetic parameters in order to ensure a suitable prediction capacity of the mathematical structure. The system consists of two SBR bioreactors, the first being used to produce hydrogen peroxide (H₂O₂) that is fed to a second reactor where the iron oxidation is carried out by chemical-biological processes. Model predictions were compared with experimental data for the production of H₂O₂ and for ferrous iron oxidation, finding suitable correlation coefficients (r²> 0.98) for each state variable. The bifurcation analysis showed the trajectories of the main variables, such as, biomass, H₂O₂ and ferrous iron, under the change of the most influential kinetic parameters. This analysis demonstrates the usefulness of the constructed model to predict the kinetic behaviour of the SBR-type process.

关键词: Bifurcation analysis, Hydrogen peroxide, Iron oxidation, Modeling, Simulation

Edgar N. Tec-Caamal, Refugio Rodríguez-Vázquez, Luis G. Torres-Bustillos, Ricardo Aguilar-López. Kinetic analysis via mathematical modeling for ferrous iron oxidation in a class of SBR-type system[J]. Chinese Journal of Chemical Engineering, 2019, 27(10): 2472-2480.

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