title: Hydrodynamic drag force exerted on activated sludge floc at intermediate Reynolds number.
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 C(D)Omega 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.
authors.affiliation: Chemical Engineering Department, National Taiwan University, Taipei, 10617, Taiwan.
authors.forename: H Y
authors.initials: HY
authors.lastname: Chung
authors.forename: S P
authors.initials: SP
authors.lastname: Ju
authors.forename: D J
authors.initials: DJ
authors.lastname: Lee