Accelerating the spread of the active mixing region in a sludge simulant using submerged jets

Kennedy, S, Bhattacharyya, P, Eshtiaghi, N and Parthasarathy, R 2016, 'Accelerating the spread of the active mixing region in a sludge simulant using submerged jets', Chemical Engineering Research and Design, vol. 114, pp. 331-340.


Document type: Journal Article
Collection: Journal Articles

Title Accelerating the spread of the active mixing region in a sludge simulant using submerged jets
Author(s) Kennedy, S
Bhattacharyya, P
Eshtiaghi, N
Parthasarathy, R
Year 2016
Journal name Chemical Engineering Research and Design
Volume number 114
Start page 331
End page 340
Total pages 10
Publisher Elsevier
Abstract In anaerobic digesters operated in a municipal wastewater plant, submerged recirculating jet streams are often used for the purpose of agitating sludge. However, due to the complex rheology of the sludge, large portions of the digester can remain stagnant and the stagnant volume changes slowly with time. The rate of change varies with time which is determined by the rheological nature of the sludge. In our previous flow visualisation study involving a downward facing jet recirculating a transparent, non-Newtonian, sludge simulant in a model digester, we have shown that the rate of decrease of inactive volume occurs in three distinct flow regimes. In practice, some of these flow regimes can persist for an undesirably long period of time and delay the acquisition of a fully "active" state within the vessel. Our experiments in the present work carried out using the same sludge simulant reveal that the time-span of the flow regimes can be remarkably shortened by a simple change in the geometry of the recirculating jet. The findings reported here open up the possibility of improving the extent of mixing of highly viscous, non-Newtonian feeds within shorter time frame and lowering specific power input in systems operated with recirculating submerged jets.
Subject Chemical Engineering not elsewhere classified
Resources Engineering and Extractive Metallurgy not elsewhere classified
Keyword(s) Flow visualisation
Inactive volume
Mixing
Non-Newtonian liquids
Sludge rheology
Submerged jet
DOI - identifier 10.1016/j.cherd.2016.08.030
Copyright notice © Institution of Chemical Engineers
ISSN 0263-8762
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