Clear model fluid with similar rheological behavior of municipal sludge

Eshtiaghi, N, Markis, F, Baudez, J, Gupta, R, Parthasarathy, R and Slatter, P 2011, 'Clear model fluid with similar rheological behavior of municipal sludge', in Proceedings of the 2011 AIChE Annual Meeting, Minneapolis, United States, 16-21 Oct., 2011, pp. 1-5.


Document type: Conference Paper
Collection: Conference Papers

Title Clear model fluid with similar rheological behavior of municipal sludge
Author(s) Eshtiaghi, N
Markis, F
Baudez, J
Gupta, R
Parthasarathy, R
Slatter, P
Year 2011
Conference name 2011 AICHE Annual Meeting
Conference location Minneapolis, United States
Conference dates 16-21 Oct., 2011
Proceedings title Proceedings of the 2011 AIChE Annual Meeting
Publisher American Institute of Chemical Engineers by Omnipress
Place of publication Minneapolis, United States
Start page 1
End page 5
Total pages 5
Abstract Anaerobic digestion is a key treatment process for solids treatment and energy generation in sewage treatment plant. Currently, research is focused on solving the issues associated with efficiency of mixing in anaerobic digesters. This includes experimental investigations on real sludge followed by Computational Fluid Dynamics (CFD) modeling. Using opaque liquids such as sludge for experimental work limits visualization of mixing flow and subsequently the digester is treated as a "black box". Digested sludge is a complex material with both non-Newtonian and thixotropic characteristics. In steady state, it can be modeled by a basic (but truncated) power-law, however, for short-time processes the Herschel-Bulkley model can be sufficiently powerful to model liquid-like properties. A comparison of three model fluids, Carboxymethyl Cellulose (CMC), Carbopol gel and Laponite clay revealed that these fluids could only model certain aspects of sludge behaviour. The rheological behaviour of sludge was therefore modeled using CMC in steady state, Carbopol gel for short-time flows and clay suspension for thixotropic modeling.
Subjects Rheology
Wastewater Treatment Processes
Keyword(s) Municipal sludge
Rheology
Non-Newtonian fluid
Copyright notice © 2011 American Institute of Chemical Engineers by Omnipress
ISBN 9780816910700
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