The duplicity of floc strength

The breakage of flocs is dependent upon the strength of the bonds holding the aggregate together. The present work describes the breakage and re-growth behaviour of three different types of floc, these were: 1) coagulant precipitate flocs, 2) turbidity flocs and 3) organic matter flocs. Floc aggrega...

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Bibliographic Details
Published in:Water science and technology 2004-01, Vol.50 (12), p.63-70
Main Authors: Jarvis, P, Jefferson, B, Parsons, S
Format: Article
Language:English
Subjects:
Bonding strength
Breakage
Coagulants
Flocculation
Jar tests
Lasers
Nanotechnology
Organic Chemicals - analysis
Organic Chemicals - chemistry
Organic matter
Particle Size
Sewage - chemistry
Shears
Turbidity
Water Purification - methods
Water Supply - analysis
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Summary:The breakage of flocs is dependent upon the strength of the bonds holding the aggregate together. The present work describes the breakage and re-growth behaviour of three different types of floc, these were: 1) coagulant precipitate flocs, 2) turbidity flocs and 3) organic matter flocs. Floc aggregates were exposed to increased levels of shear on a conventional jar tester and the sizes of the flocs were observed dynamically using a laser diffraction instrument. The organic flocs showed most resistance to breakage across the whole range of shears under investigation. The dynamic procedure provided detailed information on particle size distributions (PSD). Large and small scale degradation events could be identified from analysis of the PSD data. All of the flocs under investigation showed little re-growth potential after breakage. The precipitate and organic flocs showed slightly better re-aggregation of the small floc sizes.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2004.0696