Impact of temperature and duration of thermal treatment on different concentrations of anaerobic digested sludge: Kinetic similarity of organic matter solubilisation and sludge rheology

Farno, E, Baudez, J, Parthasarathy, R and Eshtiaghi, N 2015, 'Impact of temperature and duration of thermal treatment on different concentrations of anaerobic digested sludge: Kinetic similarity of organic matter solubilisation and sludge rheology', Chemical Engineering Journal, vol. 273, pp. 534-542.


Document type: Journal Article
Collection: Journal Articles

Title Impact of temperature and duration of thermal treatment on different concentrations of anaerobic digested sludge: Kinetic similarity of organic matter solubilisation and sludge rheology
Author(s) Farno, E
Baudez, J
Parthasarathy, R
Eshtiaghi, N
Year 2015
Journal name Chemical Engineering Journal
Volume number 273
Start page 534
End page 542
Total pages 9
Publisher Elsevier
Abstract Municipal digested sludge is a dispersion of agglomerated particles or flocs in a liquid medium which exhibits yield stress, shear thinning behaviour and high irreversible temperature dependence. In this study, the rate of solubilisation of organic matter in digested sludge was investigated when sludge (at different solid concentrations) was exposed to thermal treatment between 50 and 80. °C for 1 to 60. min. The organic matter solubilisation was measured using chemical oxygen demand (COD) analysis on liquor of the thermally treated sludge. The effects of the abovementioned temperature range and heating duration on yield stress and the apparent viscosity of sludge at different solid concentrations have also been investigated. The results showed that the irreversible effect of temperature was much higher at higher concentrations, higher temperatures and longer duration of treatment. It was also observed that for any sludge concentration the kinetic of COD solubilisation, yield stress and apparent viscosity reductions followed a logarithmic correlation with duration of thermal treatment. This similarity was also pronounced in the linear relationship between solubilised COD and yield stress and apparent viscosity reductions in all tested concentrations and the durations of heat treatment. Modified form of Herschel-Bulkley was used to obtain a master curve, independent of temperature, concentration and duration of thermal treatment. Furthermore, a new model was proposed for the impact of temperature and the duration of thermal treatment on yield stress and apparent viscosity reduction.
Subject Rheology
Wastewater Treatment Processes
Keyword(s) Apparent viscosity
Modified Herschel-Bulkley
Soluble COD
Thermal history
Yield stress
DOI - identifier 10.1016/j.cej.2015.03.097
Copyright notice © 2015 Elsevier B.V. All rights reserved.
ISSN 1385-8947
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