Rheological characterisation of thermally-treated anaerobic digested sludge: Impact of temperature and thermal history

Farno, E, Baudez, J, Parthasarathy, R and Eshtiaghi, N 2014, 'Rheological characterisation of thermally-treated anaerobic digested sludge: Impact of temperature and thermal history', Water Research, vol. 56, pp. 156-161.


Document type: Journal Article
Collection: Journal Articles

Title Rheological characterisation of thermally-treated anaerobic digested sludge: Impact of temperature and thermal history
Author(s) Farno, E
Baudez, J
Parthasarathy, R
Eshtiaghi, N
Year 2014
Journal name Water Research
Volume number 56
Start page 156
End page 161
Total pages 6
Publisher IWA Publishing
Abstract This study investigated the partially irreversible effect of thermal treatment on the rheology of digested sludge when it was subjected to temperature change between 20 °C and 80 °C and then cooled down to 20 °C. The yield stress, infinite viscosity and liquor viscosity of sludge were measured at 20 °C for different thermal histories and were compared to the evolution of the solubilised chemical oxygen demand (COD) of sludge liquor.The results showed that thermal history irreversibly affects sludge rheology as the yield stress of sludge which was heated to 80 °C then cooled down to 20 °C was 68% lower than the initial yield stress at 20 °C. This decrease was due to the irreversible solubilisation of solid matter during heating as underlined by soluble COD data which did not reach its original level after thermal treatment. Measured soluble COD of sludge which was heated and cooled down was much higher than the soluble COD of initial sludge. We found a proportionality of the increase of soluble COD with the decrease of the yield stress as well as increase of infinite viscosity.
Subject Rheology
Wastewater Treatment Processes
Keyword(s) Digested sludge rheology
Infinite viscosity
Soluble COD
Composition change
Yield stress
DOI - identifier 10.1016/j.watres.2014.02.048
Copyright notice © 2014 Elsevier Ltd. All rights reserved.
ISSN 0043-1354
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