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ABSTRACT
The use of activated carbon column to adsorb the organic
components in the water or wastewater is an
effective technology. Regeneration of spent GAC
becomes important for the economical feasibility. Fluidized bed
has some advantages such as better fluid-solid
contact, large flow rate, and large mass transfer
coefficient, etc. Therefore, fluidized bed is adequately used on
the adsorption operation of large flow rates.
The aqueous-phase adsorption/desorption of phenols onto coconut-
shell granular activated carbon (GAC) fluidized bed were
investigated under a variety of operating conditions
including particle sizes, activated carbon mass,
influent phenol concentrations and liquid flow rates. Also,
design and analysis of such system required a
model to describe the breakthrough curves of
adsorption/desorption systems. The model which took into
account the external mass transfer with film-
surface diffusion, surface adsorption
equilibrium and internal mass transfer was presented. Use of the
measured Langmuir isotherm equilibrium
parameters in the model permitted the
successful description of experimental data of phenols
adsorption/desorption recycle operation in GAC
fluidized bed.
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