INGAR   05399
INSTITUTO DE DESARROLLO Y DISEÑO
Unidad Ejecutora - UE
artículos
Título:
Experimental and theoretical investigation of fluidized bed anaerobic biofilm reactors,
Autor/es:
M. FUENTES MORA; M. MUSSATI; SCENNA N.; P. AGUIRRE
Revista:
BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
Editorial:
BRAZILIAN SOC CHEMICAL ENG
Referencias:
Lugar: Rio de Janeiro; Año: 2009 vol. 26 p. 457 - 468
ISSN:
0104-6632
Resumen:
Abstract - This work presents an experimental and theoretical investigation of anaerobic fluidized bed reactors
(AFBRs). The bioreactors are modeled as dynamic three-phase systems. Biochemical transformations are assumed
to occur only in the fluidized bed zone. The biofilm process model is coupled to the system hydrodynamic model
through the biofilm detachment rate; which is assumed to be a first-order function of the energy dissipation
parameter and a second order function of biofilm thickness. Non-active biomass is considered to be particulate
material subject to hydrolysis. The model includes the anaerobic conversion for complex substrate degradation and
kinetic parameters selected from the literature. The experimental set-up consisted of two mesophilic (36±1ºC) labscale
AFBRs (R1 and R2) loaded with sand as inert support for biofilm development. The reactor start-up policy
was based on gradual increments in the organic loading rate (OLR), over a four month period. Step-type
disturbances were applied on the inlet (glucose and acetic acid) substrate concentration (chemical oxygen demand
(COD) from 0.85 to 2.66 g L-1) and on the feed flow rate (from 3.2 up to 6.0 L d-1) considering the maximum
efficiency as the reactor loading rate switching. The predicted and measured responses of the total and soluble
COD, volatile fatty acid (VFA) concentrations, biogas production rate and pH were investigated. Regarding
hydrodynamic and fluidization aspects, variations of the bed expansion due to disturbances in the inlet flow rate and
the biofilm growth were measured. As rate coefficients for the biofilm detachment model, empirical values of- This work presents an experimental and theoretical investigation of anaerobic fluidized bed reactors
(AFBRs). The bioreactors are modeled as dynamic three-phase systems. Biochemical transformations are assumed
to occur only in the fluidized bed zone. The biofilm process model is coupled to the system hydrodynamic model
through the biofilm detachment rate; which is assumed to be a first-order function of the energy dissipation
parameter and a second order function of biofilm thickness. Non-active biomass is considered to be particulate
material subject to hydrolysis. The model includes the anaerobic conversion for complex substrate degradation and
kinetic parameters selected from the literature. The experimental set-up consisted of two mesophilic (36±1ºC) labscale
AFBRs (R1 and R2) loaded with sand as inert support for biofilm development. The reactor start-up policy
was based on gradual increments in the organic loading rate (OLR), over a four month period. Step-type
disturbances were applied on the inlet (glucose and acetic acid) substrate concentration (chemical oxygen demand
(COD) from 0.85 to 2.66 g L-1) and on the feed flow rate (from 3.2 up to 6.0 L d-1) considering the maximum
efficiency as the reactor loading rate switching. The predicted and measured responses of the total and soluble
COD, volatile fatty acid (VFA) concentrations, biogas production rate and pH were investigated. Regarding
hydrodynamic and fluidization aspects, variations of the bed expansion due to disturbances in the inlet flow rate and
the biofilm growth were measured. As rate coefficients for the biofilm detachment model, empirical values of±1ºC) labscale
AFBRs (R1 and R2) loaded with sand as inert support for biofilm development. The reactor start-up policy
was based on gradual increments in the organic loading rate (OLR), over a four month period. Step-type
disturbances were applied on the inlet (glucose and acetic acid) substrate concentration (chemical oxygen demand
(COD) from 0.85 to 2.66 g L-1) and on the feed flow rate (from 3.2 up to 6.0 L d-1) considering the maximum
efficiency as the reactor loading rate switching. The predicted and measured responses of the total and soluble
COD, volatile fatty acid (VFA) concentrations, biogas production rate and pH were investigated. Regarding
hydrodynamic and fluidization aspects, variations of the bed expansion due to disturbances in the inlet flow rate and
the biofilm growth were measured. As rate coefficients for the biofilm detachment model, empirical values of-1) and on the feed flow rate (from 3.2 up to 6.0 L d-1) considering the maximum
efficiency as the reactor loading rate switching. The predicted and measured responses of the total and soluble
COD, volatile fatty acid (VFA) concentrations, biogas production rate and pH were investigated. Regarding
hydrodynamic and fluidization aspects, variations of the bed expansion due to disturbances in the inlet flow rate and
the biofilm growth were measured. As rate coefficients for the biofilm detachment model, empirical values of
3.73⋅104 and 0.75⋅104 s2 kg-1 m-1 for R1 and R2, respectively, were estimated.⋅104 and 0.75⋅104 s2 kg-1 m-1 for R1 and R2, respectively, were estimated.
Keywords: Anaerobic Processes; Biofilms; Dynamic Modeling; Fluidized Bed Bioreactors; Wastewater
Treatment.: Anaerobic Processes; Biofilms; Dynamic Modeling; Fluidized Bed Bioreactors; Wastewater
Treatment.