Effect of thermal history on municipal digested sludge rheology: Experimental and modeling

Farno, E, Parthasarathy, R, Baudez, J and Eshtiaghi, N 2013, 'Effect of thermal history on municipal digested sludge rheology: Experimental and modeling', in Kathy Hirschfeld (ed.) Chemeca 2013 : Challenging Tomorrow, Brisbane, Australia, 29 September - 2 October 2013, pp. 1-6.


Document type: Conference Paper
Collection: Conference Papers

Title Effect of thermal history on municipal digested sludge rheology: Experimental and modeling
Author(s) Farno, E
Parthasarathy, R
Baudez, J
Eshtiaghi, N
Year 2013
Conference name Challenging Tomorrow
Conference location Brisbane, Australia
Conference dates 29 September - 2 October 2013
Proceedings title Chemeca 2013 : Challenging Tomorrow
Editor(s) Kathy Hirschfeld
Publisher Engineers Australia
Place of publication Barton, ACT, Australia
Start page 1
End page 6
Total pages 6
Abstract The rheological characteristics of digested sludge are severely temperature dependent. An effect of temperature on rheological properties of digested sludge is partially irreversible. In this paper, the effects of temperature change and thermal history on viscosity of digested sludge were studied using a stress-controlled rheometer which was connected to a temperature controlled water bath. Digested municipal sludge were collected from one of Melbourne wastewater treatment plants and subjected to change of temperature from 20-80°C. In addition, the effect of temperature on the sludge composition was studied by measuring solubilized chemical oxygen demand (COD) in sludge liquor. The Herschel-Bulkley equation was used to model the data. The yield stress and the apparent viscosity were measured and compared at different temperatures. The results showed that by changing the temperature, the sludge becomes more fluid; however, the rheological characteristics of sludge including yield stress and apparent viscosity do not come back to their original values after cooling the heated sludge. The solubilized COD showed a composition change after cooling the heated sludge which confirmed the irreversible change in the rheological characteristics of digested sludge.
Subjects Rheology
Keyword(s) digested sludge rheology
viscosity
Herschel- Bulkley model
COD
composition change
Copyright notice © 2013 Engineers Australia
ISBN 9781922107077
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