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2007 | 9 | 2 | 1-4

Article title

Mathematical modelling of wet oxidation of excess sludge


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A mathematical model enabling a quantitative description of wet oxidation of excess sludge in continuous bubble columns is proposed. The model consists of mass and heat transfer kinetic equations and material and heat balance equations of gas and liquid phases flowing through the absorber. The equations of material and heat balance refer to a parallel, co- current flow of gas and liquid phase and take into account a complex chemical reaction in the liquid phase core. The proposed model was used in a numerical simulation of wet oxidation in a bubble absorber for different process conditions: flow rate and composition of the gas and liquid phase, temperature and pressure, and different heights and diameters of the column.









Physical description


1 - 1 - 2007
19 - 10 - 2007


  • Faculty of Process and Environmental Engineering, Technical University of Łódź, 90-924 Łódź, ul Wólczańska 213, Poland
  • Faculty of Process and Environmental Engineering, Technical University of Łódź, 90-924 Łódź, ul Wólczańska 213, Poland


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  • Kolaczkowski S. T., Plucinski P., Beltran F. J., Rivas F. J., McLurgh D. B.: Wet air oxidation: a review of process technologies and aspects in reactor design., Chem. Eng. J., 1999, 73(2), 1999.[Crossref]
  • Debellefontaine H., Foussard J. N.: Wet air oxidation for the treatment of industrial wastes. Chemical aspects, reactor design and industrial applications in Europe, Waste Management, 2000, 20, 15.[Crossref]
  • Bień J. B.: Osady ściekowe - teoria i praktyka, Politechnika Częstochowska, 2002.
  • Tettamanti M., Lasagni M., Collina E., Sancassani M., Pitea D., Fermo P., Fariati F.: Thermal Oxidation Kinetics and Mechanism of Sludge from a Wastewater Treatment Plant, Environ. Sci. Technol., 2001, 35, 3981.[PubMed][Crossref]
  • Imbierowicz M., Chacuk A.: The advanced kinetic model of the excess activated sludge wet oxidation, Pol. J. Chem. Tech., 2006, 8(2), 16.
  • Zarzycki R., Chacuk A.: Absorption: Fundamentals & Applications, Pergamon Press, Oxford, 1993.
  • Michelsen M. L.: An efficient general purpose method for the integration of stiff ordinary differential equations, AIChE J., 1976, 22(3), 594.[Crossref]

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