Multilevel Structure of Sludge Flocs
Resource
Journal of Colloid and Interface Science 252 (2): 383-392
Journal
Journal of Colloid and Interface Science
Journal Volume
252
Journal Issue
2
Pages
383-392
Date Issued
2002
Date
2002
Author(s)
Abstract
In this work, the structure of two kaolin sludges and a waste activated sludge are investigated using both light-scattering and free-settling methods. Fractal dimensions estimated by the light-scattering and free-settling techniques (D(S) and D(F) respectively) differ significantly and support the hypothesis that naturally occurring aggregates possess a multilevel structure. A two-level floc structural model comprised of (i) a primary floc (of fractal dimension D(S)) consisting of primary particles and (ii) a secondary floc (of fractal dimension D(F)) consisting of the microflocs is proposed to interpret the experimental findings. The structural changes of sludge flocs before and after cationic flocculation are interpreted using the proposed two-level model.
Type
journal article
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