Performance evaluation of mixing systems in a model anaerobic digester

Low, S, Parthasarathy, R, Slatter, P and Eshtiaghi, N 2013, 'Performance evaluation of mixing systems 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 Performance evaluation of mixing systems 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 Performance of three mixing systems (mechanical mixing, pumped liquid recirculation and gas mixing) was investigated in a laboratory scale model anaerobic digester. A transparent model fluid, xanthan gum Keltrol T (XGKT) solution was used to represent digested sludge due to their similarity in rheological characteristics. Mixing performance in 0.15 and 0.4 wt% XGKT solutions was investigated using a flow visualisation technique involving a decolourisation method with the assistance of a fluorescent dye tracer. A constant specific power input was used for all the three mixing systems. The changes in inactive mixing volume were determined as a function of mixing time for each system. The final inactive volumes in the three mixing systems were compared to determine their mixing efficiencies. Complete mixing with less than 5% inactive volume was achieved in the 0.15 wt% solution in all the three systems. However, a significantly large inactive volume remained undestroyed in the 0.4 wt% solution. The mechanical mixing had the best performance in the 0.15 wt% solution whereas the gas sparging system showed the best mixing efficiency in the 0.4 wt% solution.
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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