Effect of radial velocity profiles on axial dispersion in packed beds: asymptotic behaviour

Luzi, Carlos Daniel; Martı́nez, Osvaldo; Barreto, Guillermo Fernando

doi:10.1007/s43153-021-00141-2

Cited by 3 publications

(2 citation statements)

References 48 publications

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“…The observed step in the curves of medium and large particle sizes for different bed heights may be attributed to axial dispersion resulting from the compaction of the bed during operation. In contrast, the bed of particles with smaller particle sizes (0.08-0.3 mm) exhibited lower difficulty in particle reorientation and was less affected by these phenomena [82,83].…”

Section: Effect Of Particle Sizementioning

confidence: 95%

“…Several studies have analyzed the adsorption of methylene blue onto banana peel in batch processes, but there is limited information regarding the effect of fixed-bed height, especially for residence time. However, Stavrinou et al [83] analyzed the adsorption process of methylene blue in both batch and continuous experiments. They analyzed their results to explain the transport phenomena involved in the continuous process and the interaction of operating conditions on removal efficiency.…”

Section: Effect Of the Fixed-bed Heightmentioning

confidence: 99%

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Continuous Removal of Dyes from Wastewater Using Banana-Peel Bioadsorbent: A Low-Cost Alternative for Wastewater Treatment

Yhon,

Mendoza,

Osorio

et al. 2023

Sustainability

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Methylene blue is a widely used dye that can have severe negative impacts on the environment and human health. Adsorption is an effective method for removing it from wastewater, but the high cost of traditional adsorbents has motivated the research into low-cost alternatives derived from waste biomass. Designing a dye-removal process requires the knowledge of breakthrough curves. This paper assesses the use of banana peel as an adsorbent in a continuous process for the removal of methylene blue. The adsorption efficiency of lab-scale continuous systems using a stock solution of 0.5 g L−1 methylene blue was analyzed. The best performance was found at pH 6, with a particle size of 0.08–0.3 mm and a fixed bed height of 7.5 cm. The total adsorption capacity was 22.11 mg/g based on experimental data and 25.40 mg/g based on mathematical modeling (Thomas model). The saturation time was 53 h. According to the results, the process conditions and adsorbent characteristics have a critical role in the design of continuous adsorption systems. However, further research is needed to generalize conclusions about the process and include additional experimental data under different operating conditions.

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Section: Effect Of Particle Sizementioning

confidence: 95%

Section: Effect Of the Fixed-bed Heightmentioning

confidence: 99%

Continuous Removal of Dyes from Wastewater Using Banana-Peel Bioadsorbent: A Low-Cost Alternative for Wastewater Treatment

Yhon,

Mendoza,

Osorio

et al. 2023

Sustainability

View full text Add to dashboard Cite

show abstract

Supercritical fluid extraction of coumarins and flavonoids from citrus peel

Mora,

Tavares,

Curbelo

et al. 2025

The Journal of Supercritical Fluids

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Effect of radial velocity profiles on axial dispersion in packed beds: Transient formulation

2023

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For a single-phase flow in a packed bed, systematic radial velocity profiles promote the axial dispersion of a solute, identified as trans-column dispersion and quantified by the corresponding dispersion coefficient. In a recent contribution, we evaluated the magnitude of such a dispersive effect for a long enough bed, i.e., the asymptotic behavior. However, in many practical cases, this last condition is not accomplished, and the dispersion coefficient will be lower than the asymptotic value. <p>The development of the trans-column dispersion is addressed, based on a two-dimensional two-zone model and the application of the Taylor-Aris method of moments. The results show a satisfactory agreement compared with available literature data. The effect of the vessel-to-particle diameter ratio on the development of the trans-column dispersion coefficient is also explored. As the initial growth rate of the dispersion coefficient is lower the higher the diameter ratio and the opposite trend holds for the asymptotic value, the net effect of the diameter ratio weakens up to distances of some tens of particle diameter. This result can be identified as one of the reasons for the controversy that still prevails in assessing the contribution of the trans-column dispersion to the total axial dispersion.</p> Further aspects discussed concern suitable approximations to evaluate the development of the trans-column dispersion coefficient and the comparison between the results from the Taylor-Aris method of moments and from the residence time distribution approach.

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Effect of radial velocity profiles on axial dispersion in packed beds: asymptotic behaviour

Cited by 3 publications

References 48 publications

Continuous Removal of Dyes from Wastewater Using Banana-Peel Bioadsorbent: A Low-Cost Alternative for Wastewater Treatment

Continuous Removal of Dyes from Wastewater Using Banana-Peel Bioadsorbent: A Low-Cost Alternative for Wastewater Treatment

Supercritical fluid extraction of coumarins and flavonoids from citrus peel

Effect of radial velocity profiles on axial dispersion in packed beds: Transient formulation

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