An investigation 39 on rheological behaviour of thermally treated digested sludge: dependency on solid concentration

Farno, E, Baudez, J, Parthasarathy, R and Eshtiaghi, N 2014, 'An investigation 39 on rheological behaviour of thermally treated digested sludge: dependency on solid concentration', in K. Stevenson (ed.) Proceedings of Chemeca 2014 - Processing Excellence; Powering Our Future, Perth, Australia, 28 September - 1 October 2014, pp. 1-9.


Document type: Conference Paper
Collection: Conference Papers

Title An investigation 39 on rheological behaviour of thermally treated digested sludge: dependency on solid concentration
Author(s) Farno, E
Baudez, J
Parthasarathy, R
Eshtiaghi, N
Year 2014
Conference name 2014 Chemeca
Conference location Perth, Australia
Conference dates 28 September - 1 October 2014
Proceedings title Proceedings of Chemeca 2014 - Processing Excellence; Powering Our Future
Editor(s) K. Stevenson
Publisher IChemE
Place of publication Australia
Start page 1
End page 9
Total pages 9
Abstract This study investigated the effect of temperature and duration of heat treatment on rheological properties of different concentration of digested sludge. The flow curve and the yield stress of 2%, 3% and 3.5% digested sludge have been measured before and during heat treatment at different temperatures between 20 and 80°C for different heating duration of 1, 15 and 30min. The effect of thermal history on rheology of sludge was then studied after cooling back sludge to 20°C (thermal history at 50, 60, 70 and 80°C). In addition, the effect of temperature and thermal history on solubilized chemical oxygen demand (COD) for sludge with different solid concentration was also investigated to prove the composition change of sludge during the heat treatment. The result showed that the irreversible effect of temperature was more evident at higher temperatures and concentrations. At higher concentrations (3% and 3.5%), by increasing the temperature, the yield stress decreased after an initial increase while for 2% sludge yield stress consistently decreased with increasing temperature and showed a linear relationship with decreasing particulate COD. The yield stress followed a great agreement with an exponential decreasing function of temperature and the temperature of thermal history.
Subjects Rheology
Keyword(s) thermal treatment
digested sludge
rheology
Chemical oxygen demand (COD)
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