Mixing performance of gas sparging system in a model anaerobic digester

Low, S, Parthasarathy, R, Slatter, P and Eshtiaghi, N 2013, 'Mixing performance of gas sparging system in a model anaerobic digester', in Juan M. Lema, Marta Carballa (ed.) Proceedings of the 13th World Congress on Anaerobic Digestion (AD 13), United Kingdom, 25-28 June, 2013, pp. 1-4.


Document type: Conference Paper
Collection: Conference Papers

Title Mixing performance of gas sparging system in a model anaerobic digester
Author(s) Low, S
Parthasarathy, R
Slatter, P
Eshtiaghi, N
Year 2013
Conference name AD 13: Recovering (bio) Resources for the World
Conference location United Kingdom
Conference dates 25-28 June, 2013
Proceedings title Proceedings of the 13th World Congress on Anaerobic Digestion (AD 13)
Editor(s) Juan M. Lema, Marta Carballa
Publisher International Water Association (IWA)
Place of publication United Kingdom
Start page 1
End page 4
Total pages 4
Abstract Mixing performance of a gas sparging system in a model anaerobic digester was investigated using XGKT (xanthan gum) solution, a transparent liquid, to simulate the flow behaviour of digested sludge. The effect of specific power input on mixing performance was studied with 0.15% and 0.4 wt% XGKT solutions using upward and downward gas sparging arrangements.A flow visualisation technique was used to observe the mixing patterns and the inactive volume in the vessel. Experimental results show that the specific power input has no significant effect on inactive volume reduction in both 0.15 and 0.4 wt% solutions. Both gas sparging arrangements led to homogeneous mixing in 0.15 wt% solution. However, a significantly large volume of inactive region occurred in 0.4 wt% solution and remained undestroyed even after a long period of mixing. The effect of sparging arrangement was significant only in 0.4 wt% solution. Downward sparging led to smaller inactive volumes compared to upward sparging in both solutions.
Subjects Chemical Engineering Design
Keyword(s) Digester mixing
mechanical mixing
liquid recirculation
gas sparging
model digester
Copyright notice © 2013 International Water Association (IWA)
ISBN 9788469577561
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