An Estimate of Activated-Sludge Floc Permeability: A Novel Hydrodynamic Approach

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Title:	An Estimate of Activated-Sludge Floc Permeability: A Novel Hydrodynamic Approach
Authors:	Wu, R. M.;Feng, W. H.;Tsai, I. H.;Lee, D. J.
Contributors:	淡江大學化學工程與材料工程學系
Keywords:	ACTIVATED SLUDGE;FLOC PERMEABILITY;FREEZE-THAW TREATMENT;HYDRODYNAMIC DRAG FORCE
Date:	1998-01-01
Issue Date:	2013-04-13 15:27:54 (UTC+8)
Publisher:	Water Environment Federation
Abstract:	This work estimates the interior permeability of waste activated sludge flocs by observing the motion of individual flocs moving vertically toward an impermeable flat plate. Through a comparison of experimental data with theoretical predictions in the literature, floc permeabilities of original sludge and freeze-thaw-conditioned sludges are found to be 0.7 × $10^{-7}$ to 5 × $10^{-7}$ ${\rm m}^{2}$ and 0.9 × $10^{-9}$ to 6 × $10^{-9}$ ${\rm m}^{2}$ , respectively. Moreover, incorporating inertial effect delays the influence of the flat plate, thereby causing the creeping-flow-based correlation to fail.
Relation:	Water Environment Research 70(7), pp.1258-1264
DOI:	10.2175/106143098X123615
Appears in Collections:	[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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