Hydrodynamic drag force exerted on activated sludge floc at intermediate Reynolds number
Resource
Journal of Colloid & Interface Science 263(2003), 498–505
Journal
Journal of Colloid and Interface Science
Pages
-
Date Issued
2003
Date
2003
Author(s)
DOI
246246/2006111501275357
Abstract
We hung the activated sludge flocs on an elastic nylon stick and then subjected it to a uniform water flow and measured its displacement.
The hydrodynamic drag force exerted on the floc was subsequently estimated, both for cationic flocculated flocs and for flocculated and then
frozen/thawed flocs. A confocal laser scanning microscope (CLSM) was employed to probe the interior structure of flocs. Polyelectrolyte
flocculation leads to a compact global structure, and hence high drag force exerted on the floc by water. The corresponding CDΩ value at
Re = 12–27 for flocs ranges from 1.58 to 3.61. Fast freezing would little affect the hydrodynamic drag force. Slow freezing, in contrast,
considerably consolidated the floc structure and hence presented impermeable sphere-like behavior of the slowly frozen/thawed flocs.
Subjects
Floc structure
Drag force
Activated sludge
Freezing
Measurement
SDGs
Publisher
Taipei:National Taiwan University Dept Chem Engn
Type
journal article
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