New measurement techniques for secondary settlers: a review

In activated sludge wastewater treatment research, most of the attention has been devoted to the biodegradation process. However, in terms of effluent quality, the final settling and clarification processes are at least as important because any particle carried over the overflow weir brings with it...

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Bibliographic Details
Published in:Water science and technology 2006-01, Vol.53 (4-5), p.419-429
Main Authors: Vanrolleghem, P A, Clercq, B D, Clercq, J D, Devisscher, M, Kinnear, D J, Nopens, I
Format: Article
Language:English
Subjects:
Activated sludge
Aggregation
Biodegradation
Breakage
Compression
Compression tests
Flocculation
Fluid dynamics
Fluid flow
Hydrodynamics
Measurement
Measurement techniques
Membrane separation
Overflow
Particle Size
Phosphorus
Separation
Settlers
Settling
Sludge
Waste Disposal, Fluid
Wastewater
Wastewater treatment
Weirs
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Summary:In activated sludge wastewater treatment research, most of the attention has been devoted to the biodegradation process. However, in terms of effluent quality, the final settling and clarification processes are at least as important because any particle carried over the overflow weir brings with it not only COD, but also nitrogen and phosphorus. In recent years we see indeed increased attention on this separation step, and alternatives such as membrane separation are increasingly introduced. Still, a large installed base of settlers exists, whose operation could/should be optimised. The measurement techniques presented in this contribution each focus on one of the key processes in the secondary settler: hydrodynamics, particle aggregation and breakage, hindered settling and compression. For each technique, the measuring principle is explained and a typical data set shown.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2006.148