Three‐Phase (Gas–Liquid–Solid) Fluidization

Pjontek, Dominic; Donaldson, Adam; Macchi, Arturo

doi:10.1002/9783527699483.ch22

Cited by 1 publication

(1 citation statement)

References 43 publications

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“…More importantly, the liquid-solid/gas-liquidsolid systems can mitigate the cell damage/death due to mechanical stress which is caused by the agitated impellers in stirred-tank bioreactor. To allow the fluidization of tiny microbials, the cell immobilization methods such as attachment and encapsulation are used to make the microorganisms to be fluidizable with the carriers by the upward liquid and/or gas flow [35]. In liquid-solid fluidized bed systems, for instance, Chowdhury et al [36] used a liquid-solid circulating fluidized-bed (LSCFB) bioreactor to identify that the overall removal rates for organic (chemical oxygen demand, COD), nitrogen (N), and phosphorous (P) could be up to of 91%, 78% and 85%, respectively, with the fluidization of the Lava rock particles incorporated with biomass.…”

Section: Introductionmentioning

confidence: 99%

Design and Investigation of a 3D-Printed Micro-Fluidized Bed

Zhang

Goh

et al. 2021

ChemEngineering

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Micro-fluidized bed has aroused much attention due to its low-cost, intensified-process and fast-screening properties. In this paper, a micro-fluidized bed (15 × 15 mm in cross-section) was designed and fabricated with the use of the stereolithography printing technique, for the investigation of bubbles’ hydrodynamics and comparison of the solids (3D-printed particles VS fungal pellets) fluidization characteristics. In a liquid–gas system, bubble flow regime started from mono-dispersed homogeneous regime, followed by poly-dispersed homogeneous regime, transition bubble regime and heterogeneous bubble regime with increasing gas flowrates from 3.7 mL/min to 32.7 mL/min. The impacts from operating parameters such as gas flowrate, superficial liquid velocity and gas sparger size on bubble size, velocity and volume fraction have been summarized. In liquid–solid fluidization, different solid fluidization regimes for both particles bed and pellets bed were identified. From the bed expansion results, much higher Umf of 7.8 mm/s from pellets fluidization was observed compared that of 2.3 mm/s in particles fluidization, because the hyphal structures of fungal pellets increased surface friction but also tended to agglomerate. The similar R–Z exponent n (5.7 and 5.5 for pellets and particles, respectively) between pellets and particles was explained by the same solid diameter, but much higher Ut of 436 µm/s in particles bed than that of 196 µm/s in pellets bed is a consequence of the higher density of solid particles. This paper gives insights on the development of MFB and its potential in solid processing.

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Section: Introductionmentioning

confidence: 99%