Skin layer on thermally dried sludge cake
Journal
Drying Technology
Journal Volume
24
Journal Issue
8
Pages
1047-1052
Date Issued
2006
Author(s)
Abstract
This work utilized an X-ray micro-computerized tomography scanner (micro-CT) to investigate how skin layers - hard and relatively impermeable layers that hinder mass transfer - form and develop on wastewater sludge cake with (cake-O) or without artificial cracks (cake-N). A novel scheme that applies Otsu's algorithm twice was employed to determine the solid phase and skin layers in the scanned cake images. Initial cracks in a cake had significant impact on how the skin layer would form on the cake. A unique correlation between effective surface area to drying (not covered by a skin layer) and moisture content was identified. The advancement velocities of skin layers on drying cake were evaluated.
Subjects
Drying
Image analysis
Skin layer
Sludge
SDGs
Type
journal article