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[Adsorption dynamics and breakthrough characteristics based on the fluidization condition].

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    Fluidized bed reactors demonstrate superior phenol adsorption efficiency and capacity compared to fixed beds. This study highlights their potential for effective wastewater treatment using granular activated carbon.

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    Area of Science:

    • Environmental Science
    • Chemical Engineering
    • Materials Science

    Background:

    • Limited research exists on adsorption dynamics and breakthrough in fluidized beds.
    • Phenol contamination in water poses significant environmental and health risks.
    • Granular activated carbon (GAC) is a widely used adsorbent for phenolic compounds.

    Purpose of the Study:

    • To investigate and compare the adsorption performance of a fluidized bed reactor versus a fixed bed reactor for phenol removal.
    • To analyze adsorption dynamics, breakthrough characteristics, and adsorption capacities under varying fluidization conditions.
    • To evaluate the efficiency of GAC as an adsorbent in both reactor configurations.

    Main Methods:

    • Experimental investigation of phenol adsorption using GAC in both fluidized and fixed bed reactors.
    • Comparison of adsorption efficiency, dynamic characteristics, breakthrough curves, and capacities at different superficial velocities (6-13 mm/s).
    • Kinetic modeling using the Pseudo-second-order model to describe adsorption behavior.

    Main Results:

    • Both reactor types achieved >93% adsorption efficiency within 5 minutes at superficial velocities of 8 mm/s and 13 mm/s.
    • Adsorption kinetics followed the Pseudo-second-order model with high linearity (R² > 0.999).
    • Fluidized bed reactors exhibited higher adsorption capacities (8.77 mg/g at 6 mm/s, 24.70 mg/g at 8 mm/s) compared to fixed beds.

    Conclusions:

    • Fluidized bed reactors offer enhanced phenol adsorption efficiency and capacity over fixed bed reactors.
    • The Pseudo-second-order model accurately describes the adsorption kinetics in both systems.
    • Fluidized bed technology presents a promising approach for efficient removal of phenolic pollutants from wastewater.