, Volume 25, Issue 2, pp 239–251 | Cite as

A model to describe the performance of the UASB reactor

  • Raúl Rodríguez-Gómez
  • Gunno Renman
  • Luis Moreno
  • Longcheng Liu
Original Article


A dynamic model to describe the performance of the Upflow Anaerobic Sludge Blanket (UASB) reactor was developed. It includes dispersion, advection, and reaction terms, as well as the resistances through which the substrate passes before its biotransformation. The UASB reactor is viewed as several continuous stirred tank reactors connected in series. The good agreement between experimental and simulated results shows that the model is able to predict the performance of the UASB reactor (i.e. substrate concentration, biomass concentration, granule size, and height of the sludge bed).


CSTR Kinetic Model UASB Wastewater 

List of symbols


Continuous stirred tank resctor


Diffusion coefficient of substrate within the granule (m2 h−1)


Inactive biomass concenration (kg m−3)


Saturation constant (kg COD m−3 h−1)


Decay rate (h−1)


Inhibition constant(kg m−3)


Mass transfer coefficient (m h−1)


Half saturation concentration (kg m−3)


Grau second order substrate removal rate constant (h−1)


Number of CSTR


Number of granules per volume of reactor (granule m−3)


Organic loading reate (kg COD m−3 h−1)


Péclet number


Flow rate (m3 h−1)


Flux (kg m−2 h−1)


Granule radius (m)


Initial radius of the granule (m)


Kinetic term (kg m−3 h−1)


Radial distance from the center of the granule (m)


Substrate concentration (kg m−3)


Inlet substrate concentration (kg m−3)


Effluent substrate concentration (kg m−3)


Substrate concentration within the granule (kg m−3)


Gradient of the substrate (kg m−2 h−1)


Time (h)


Maximum utilization rate constant (kg COD m−3 h−1)


Volume of CSTR (m3)


Biomass concentration (kg m−3)


Yield [kg VSS generated (kg COD degraded)−1)]


Kinetic parameter [kg COD (kg VSS)−1)]


Volume fraction occupied by the granules


Density of the biomass (kg m−3)


Maximum specific growth rate (h−1)


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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Raúl Rodríguez-Gómez
    • 1
    • 2
  • Gunno Renman
    • 2
  • Luis Moreno
    • 1
  • Longcheng Liu
    • 1
  1. 1.Department of Chemical Engineering and TechnologyRoyal Institute of Technology (KTH)StockholmSweden
  2. 2.Land and Water Resources EngineeringRoyal Institute of Technology (KTH)StockholmSweden

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