Waste water sludge; Sawdust; Convective drying; X-ray tomography; Mercury porosimetry
Abstract :
[en] Abstract Convective drying of waste water sludge and sawdust-sludge mixtures in a pilot-scale fixed bed was studied. Drying was performed in a cross-flow convective dryer using 500 g of wet material extruded through a disk with circular dies 12 mm in diameter. The structure of the bed mainly shows volume shrinkage and crack formation during drying. Several characterization techniques were used over a wide range of scales from nm up to mm. The overall bed structure was imaged with X-ray macrotomography, at a resolution of 0.36 mm per pixel. Single extrudates were scanned with X-ray microtomography, at a resolution of 41 μm per pixel. Pore structure of the dried samples were characterized by mercury porosimetry (7.5 nm < dp < 150 μm). Results show significant structural changes on all scales with increasing amounts of sawdust: shrinkage decreases, crack formation increases, and the pores become larger. This confirms the benefits of sawdust addition for sludge drying applications.
Disciplines :
Chemical engineering
Author, co-author :
Li, Jie ; Université de Liège > Département de chimie appliquée > Génie chimique - Procédés et développement durable
Plougonven, Erwan ; Université de Liège > Département de chimie appliquée > Génie chimique - Procédés et développement durable
Fraikin, Laurent ; Université de Liège > Département de chimie appliquée > Génie chimique - Procédés et développement durable
Salmon, Thierry; Université de Liège - ULiège > Département de Chimie Appliquée
Toye, Dominique ; Université de Liège > Département de chimie appliquée > Génie de la réaction et des réacteurs chimiques
Nistajakis, Emmanuel
Léonard, Angélique ; Université de Liège > Département de chimie appliquée > Génie chimique - Procédés et développement durable
Language :
English
Title :
Multiscale structure characterization of sawdust-waste water sludge extrudates dried in a pilot-scale fixed bed
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