Characterization and modeling of gas-liquid-solid fluidized-bed reactors
The pressure fluctuation behavior in a 4 inch ID gas-liquid-solid-fluidized bed is studied in this work for a wide variety of particles. The average root mean square of the pressure fluctuations and power spectral density function of the pressure signals are used to characterize the transitions among the various flow regimes. The effect of particle size on the reactant conversion for a pseudo-first order reaction in a catalytic reactor is examined based on a comprehensive model developed in this study. The reactant conversion predicted by the model exhibits a maximum with respect to particle size. Overall reaction rates in the fluidized bed system are compared to those predicted for a slurry bubble column utilizing a sedimentation-dispersion model for the solids. A comprehensive model is presented for biological phenol degradation in a bed containing a mixed culture of immobilized living cells. Double-substrate limiting kinetics and substrate inhibition are considered in the model. Biodegradation rates and phenol and dissolved oxygen concentrations predicted by the model are in excellent agreement with experimental data. The model is used to examine the effects of inlet phenol concentration and biofilm thickness on the biodegradation rate. A mathematical model is also developed for the transient response of a draft tube bioreactor to a step increase in influent phenol concentration. The model considers external mass transfer resistance, the simultaneous diffusion, reaction, and adsorption of phenol and oxygen inside the bioparticles, the dynamics of biofilm growth, the time delay of microbial growth during the transient period, and variations in biofilm thickness and density with biofilm growth.
- Research Organization:
- Ohio State Univ., Columbus (USA)
- OSTI ID:
- 6124355
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
FLUIDIZED BEDS
MATHEMATICAL MODELS
ADSORPTION
BIOCHEMICAL REACTION KINETICS
BIODEGRADATION
BIOREACTORS
CHEMICAL REACTION KINETICS
CHEMICAL REACTORS
DIFFUSION
FLOW MODELS
GASES
GROWTH
IMMOBILIZED CELLS
INHIBITION
LIQUIDS
LOADING RATE
MICROORGANISMS
PARTICLE SIZE
PHENOLS
PRESSURE GRADIENTS
SOLIDS
AROMATICS
CHEMICAL REACTIONS
DECOMPOSITION
FLUIDS
HYDROXY COMPOUNDS
KINETICS
ORGANIC COMPOUNDS
REACTION KINETICS
SIZE
SORPTION
140504* - Solar Energy Conversion- Biomass Production & Conversion- (-1989)