Comparison of three granular support materials for anaerobic fluidized bed systems |
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Authors: | D. García-Calderón P. Buffière R. Moletta S. Elmaleh |
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Affiliation: | (1) Laboratoire de Biotechnologie de l'Environnement INRA, Av. des Etangs, 11100 Narbonne, France;(2) Groupe Génie des Procédés, Université Montpellier, II CC 024 34095, 5 Montpellier, France |
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Abstract: | Summary Three different materials, kaolin, pozzolana and biolite (a material used in a commercial anaerobic fluidized bed treatment process) when tested as supports for an anaerobic fluidized bed system had similar physical and fluidization properties but behaved differently towards the biomass hold-up. However, all three systems attained similar removal efficiency rates.Nomenclature U Fluidization velocity (m/s) - U1 Terminal fluidization velocity (m/s) - g Local acceleration due to gravity (m/s2) - s Solid density (kg/m3) - f Fluid density (kg/m3) - P Pressure drop (Pa) - HRT Hydraulic retention time (days) - Hmf Height of bed at minimum fluidization (m) - H Height of bed (m) - Cd Drag coefficient (dimensionless) - W Mass of solids in bed (kg) - dp Particle diameter (m) - A Cross-sectional area of column (m2) - h column height (m) - Rct Terminal Reynolds no. - Voidagc (fractional free volume, dimensionless) - mf Voidage (fractional free volume) at minimum of fluidization (dimensionless) |
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Keywords: | carrier materials fluidization biofilm anaerobic digestion |
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