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An estimate of activated‐sludge floc permeability: a novel hydrodynamic approach
Author(s) -
Wu R.M.,
Feng W.H.,
Tsai I.H.,
Lee D.J.
Publication year - 1998
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143098x123615
Subject(s) - permeability (electromagnetism) , activated sludge , flocculation , chemistry , geotechnical engineering , environmental engineering , mechanics , soil science , environmental science , materials science , wastewater , geology , physics , membrane , biochemistry
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 m 2 and 0.9 × 10 −9 to 6 × 10 −9 m 2 , respectively. Moreover, incorporating inertial effect delays the influence of the flat plate, thereby causing the creeping‐flow‐based correlation to fail.