Bubble rise velocity and bubble size in thickened waste activated sludge: Utilising electrical resistance tomography (ERT)

Bobade, V, Evans, G and Eshtiaghi, N 2019, 'Bubble rise velocity and bubble size in thickened waste activated sludge: Utilising electrical resistance tomography (ERT)', Chemical Engineering Research and Design, vol. 148, pp. 119-128.


Document type: Journal Article
Collection: Journal Articles

Title Bubble rise velocity and bubble size in thickened waste activated sludge: Utilising electrical resistance tomography (ERT)
Author(s) Bobade, V
Evans, G
Eshtiaghi, N
Year 2019
Journal name Chemical Engineering Research and Design
Volume number 148
Start page 119
End page 128
Total pages 10
Publisher Elsevier
Abstract Bubble columns are intensively used in many different industries as multiphase contactors. The gas phase properties in the bubble column significantly impact on the hydrodynamics of the column which effects on heat and mass transfer rates within the column. In this paper, electrical resistance tomography together with dynamic gas disengagement technique is used to determine the gas holdup and bubble rise velocity within the column at four different gas flow rates (17 L/min) and two different total solids concentrations of waste activated sludge (3% & 5.5%). For the first time, effective shear rate and bubble size are calculated based on the HerschelBulkley model. A linear relation was observed for the bubble rise velocity with stress imposed and between gas holdup and natural logarithm of stress imposed by gas injection.
Subject Wastewater Treatment Processes
Rheology
Keyword(s) Bubble rise velocity
Bubble size
Effective shear rate
Gas holdup
Waste activated sludge
DOI - identifier 10.1016/j.cherd.2019.05.021
Copyright notice © 2019 Institution of Chemical Engineers. Published by Elsevier B. V. All rights reserved.
ISSN 0263-8762
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