Floc model and intrafloc flow
Resource
Chemical Engineering Science 60 (2): 565-575
Journal
Chemical Engineering Science
Journal Volume
60
Journal Issue
2
Pages
565-575
Date Issued
2005
Date
2005
Author(s)
Abstract
The three-dimensional pore structures in waste activated sludge floc were identified using the fluorescence in situ hybridization (FISH) I and confocal laser scanning microscope (CLSM) images. The meshes of the three-dimensional porous configuration of a sludge floc were constructed from the CLSM series images. The intrafloc flow field was simulated for the constructed floc model when it was subjected to a uniform flow field, based on which the Darcy's permeability was estimated. The permeability (k DL) of original floc was estimated as 8 × 10 -12 m 2. Flocculated flocs had higher k DL due to their large pore size, while the corresponding values of k DL of the freeze/thawed flocs were lower. The calculated results indicate that a few large pores in the floc determine the permeability. The fractal dimension and compactness, however, are not correlated with the permeability of the flocs. © 2004 Elsevier Ltd. All rights reserved.
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Type
journal article
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