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Computational fluid dynamics simulation of two-phase flow and dissolved oxygen in a wastewater treatment oxidation ditch.

Matko, T., Chew, J., Wenk, J., Chang, J. and Hofman, J., 2021. Computational fluid dynamics simulation of two-phase flow and dissolved oxygen in a wastewater treatment oxidation ditch. Process Safety and Environmental Protection, 145 (January), 340 -353.

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CFD aeration - paper - Manuscript - Matko - submit - July 2020 - check.pdf - Accepted Version
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DOI: 10.1016/j.psep.2020.08.017

Abstract

This study presents a computational fluid dynamics (CFD) model of an aerated wastewater treatment oxidation ditch, taking into account gas-liquid flow, oxygen mass transfer and dissolved oxygen. Especially, the effect of the bubble size distribution (BSD) and the biochemical oxygen demand (BOD) distribution on the dissolved oxygen (DO) distribution has been considered. Species transport modelling predicts the DO and BOD distribution. De-oxygenation of local dissolved oxygen by BOD is modelled by an oxygen sink that depends on the local BOD concentration. Bubble coalescence and breakup models predict the BSD. The behaviour of the ditch is non-ideal, which is indicated by the residence time distribution (RTD), heterogeneous flow pattern and DO distribution. The parameters with the greatest influence on the dissolved oxygen are the BOD and bubble size. There is good agreement between the numerical simulation and the observations of flow pattern and measurements of mean DO. This study identifies that the BOD distribution and the BSD are important parameters for accurately predicting the DO distribution and which have been mostly neglected in the public research.

Item Type:Article
ISSN:0957-5820
Uncontrolled Keywords:Aeration; Oxidation ditch; Computational fluid dynamics; Dissolved oxygen; Multiphase flow; Wastewater treatment
Group:Faculty of Media & Communication
ID Code:34591
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:25 Sep 2020 09:10
Last Modified:06 Oct 2020 10:13

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