Premium
Image analysis of X‐ray microtomograms of soft materials during convective drying: 3D measurements
Author(s) -
LÉONARD A.,
BLACHER S.,
MARCHOT P.,
PIRARD J.P.,
CRINE M.
Publication year - 2005
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.2005.01485.x
Subject(s) - porosity , materials science , wastewater , thickening , convection , sewage treatment , composite material , environmental science , pulp and paper industry , mechanics , environmental engineering , engineering , physics , polymer science
Summary Drying dewatered sludge leads to a complex three‐dimensional porous structure. Moreover, this operation is dependent on the way the material is processed. In this study, textural changes of sludge extrudates submitted to convective drying are followed by a 3D image analysis of reconstructed X‐ray microtomograms. To achieve this goal, two different wastewater sludges collected in wastewater treatment plant after the thickening step and dewatered in the laboratory are used. It is showed that the evolution of the 3D‐crack ratio vs. the residual water content evolves following a hyperbolic law. The 3D opening crack size distribution reveals two different types of pore development, i.e. a continuous pore size evolution for one sludge and the sudden appearance of cracks for the other sludge.