AustralieFrV1, Main, Exploration, bibRecord, 003F75

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

Identifieur interne : 003F75 ( Main/Exploration ); précédent : 003F74; suivant : 003F76

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

Auteurs : Ehsan Farno [Australie] ; Jean Christophe Baudez [France] ; Rajarathinam Parthasarathy [Australie] ; Nicky Eshtiaghi [Australie]

Source :

Water research : (Oxford) [ 0043-1354 ] ; 2014.

RBID : Pascal:14-0182837

Descripteurs français

Pascal (Inist)
- Traitement déchet, Boue résiduaire, Propriété rhéologique, Viscosité, Traitement thermique, Effet température, Histoire thermique.

English descriptors

KwdEn :
- Heat treatment, Rheological properties, Sewage sludge, Temperature effect, Thermal history, Viscosity, Waste treatment.

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.

Affiliations:

Australie, France

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to stream Main, to step Merge: 004033
to stream Main, to step Curation: 003F75

Le document en format XML

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<front><div type="abstract" xml:lang="en">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.</div>
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Rheological characterisation of thermally-treated anaerobic digested sludge: Impact of temperature and thermal history

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

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri