Porosity and interior structure of flocculated activated sludge floc
Resource
Journal of Colloid and Interface Science 267 (1): 136-143
Journal
Journal of Colloid and Interface Science
Journal Volume
267
Journal Issue
1
Pages
136-143
Date Issued
2003
Date
2003
Author(s)
Chung, H. Y.
Abstract
This work estimated the porosities of activated sludge flocs, cationic polyelectrolyte flocculated, based on free-settling tests, buoyant weight measurements, and confocal laser scanning microscope (CLSM) tests. The extent of advective flow was estimated based on bubble-tracking test. The former two measurements suggested a close-to-unity porosity, that is, an extremely void floc interior. Meanwhile, the latter two tests recommended a dense floc interior with a porosity less than 64%. A discrepancy exists between the porosities estimated by various tests. A floc model was proposed based on the understanding that a vast amount of bound water in the floc was regarded as void in buoyant weight measurement, but was impermeable for advective flow. The distribution rather than the mean value of the porosity controls the advective flow. There existed no simple correlation between the porosities measured by different tests.
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Type
journal article
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