Investigating the Effect of Multiple Reference Frame Approach on the Modelling of an Oxidation Ditch

Norouzi-Firouz, Hossein; Sarrafzadeh, Mohammad‐Hossein; Zarghami, Reza

doi:10.1007/s41742-018-0095-x

Cited by 4 publications

(1 citation statement)

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“…Based on our previous work, [46] the multiple-reference-frame approach (MRF) has been applied for simulating the rotation of surface aerators in this study with an appropriate dimension of the rotating zone.…”

Section: Hydrodynamic Modelmentioning

confidence: 99%

A coupled hydrodynamic‐biokinetic simulation of three‐phase flow in an oxidation ditch using CFD

et al. 2021

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Coupling the hydrodynamic and biokinetic models, was done on a lab-scale oxidation ditch as the bioreactor of the activated sludge process and validated against the available experimental data. The simulation was carried out in three-phase, three-dimensional conditions with k-є and Eulerian-Eulerian methods. A simplified activated sludge model No.1 (ASM1) has been added to transport terms to account for the biokinetic model. Rotatory speed for surface aerator was initially increased and its corresponding effects on solid volume fraction, dissolved oxygen, and velocity profile and values were observed. A 150 rpm increase in the rotational velocity resulted in 36% higher average liquid phase velocity for the one-aerator arrangement, which was 3% more than that of the two-aerator oxidation ditch. The 150% increase in the solid volume fraction led to a 10% reduction in the maximum liquid phase velocity. The effect of aerators number has been considered explicitly on baffle performance and liquid phase velocity profile. Finally, a new design for the aerator has been offered that provides an ordered flow field and optimal conditions for the performance of the baffle and oxidation process.

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Section: Hydrodynamic Modelmentioning

confidence: 99%