Mixing characteristics of sludge simulant in a model anaerobic digester

Low, S, Eshtiaghi, N, Slatter, P, Baudez, J and Parthasarathy, R 2016, 'Mixing characteristics of sludge simulant in a model anaerobic digester', Bioprocess and Biosystems Engineering, vol. 39, no. 3, pp. 473-483.


Document type: Journal Article
Collection: Journal Articles

Title Mixing characteristics of sludge simulant in a model anaerobic digester
Author(s) Low, S
Eshtiaghi, N
Slatter, P
Baudez, J
Parthasarathy, R
Year 2016
Journal name Bioprocess and Biosystems Engineering
Volume number 39
Issue number 3
Start page 473
End page 483
Total pages 11
Publisher Springer
Abstract This study aims to investigate the mixing characteristics of a transparent sludge simulant in a mechanically agitated model digester using flow visualisation technique. Video images of the flow patterns were obtained by recording the progress of an acid-base reaction and analysed to determine the active and inactive volumes as a function of time. The doughnut-shaped inactive region formed above and below the impeller in low concentration simulant decreases in size with time and disappears finally. The 'cavern' shaped active mixing region formed around the impeller in simulant solutions with higher concentrations increases with increasing agitation time and reaches a steady state equilibrium size, which is a function of specific power input. These results indicate that the active volume is jointly determined by simulant rheology and specific power input. A mathematical correlation is proposed to estimate the active volume as a function of simulant concentration in terms of yield Reynolds number.
Subject Wastewater Treatment Processes
Chemical Engineering Design
Rheology
Keyword(s) Active volume
Anaerobic digester
Mechanical mixing
Sludge simulant
DOI - identifier 10.1007/s00449-015-1530-4
Copyright notice © Springer-Verlag 2016
ISSN 1615-7591
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