Multiscale structure characterization of sawdust-waste water sludge extrudates dried in a pilot-scale fixed bed

[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

Publication date :

27 June 2015

Journal title :

Biomass and Bioenergy

ISSN :

0961-9534

eISSN :

1873-2909

Publisher :

Elsevier, United Kingdom

Volume :

Issue :

Pages :

98 - 107

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://www.sciencedirect.com/science/article/pii/S0961953415300234

Available on ORBi :

since 29 June 2015

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