Activated Sludge Flocculation: On-Line Determination of Floc Size and the Effect of Shear

Biggs, C. A. and Lant, P. A. (2000) Activated Sludge Flocculation: On-Line Determination of Floc Size and the Effect of Shear. Water Research, 34 9: 2542-2550.


Author Biggs, C. A.
Lant, P. A.
Title Activated Sludge Flocculation: On-Line Determination of Floc Size and the Effect of Shear
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
Publication date 2000
Sub-type Article (original research)
DOI 10.1016/S0043-1354(99)00431-5
Volume 34
Issue 9
Start page 2542
End page 2550
Total pages 9
Place of publication UK
Publisher Elsevier Science Ltd
Collection year 2000
Language eng
Subject C1
291104 Environmental Technologies
770502 Land and water management
Abstract This paper presents a technique which enables on-line monitoring of activated sludge flocculation. The usefulness of this technique is demonstrated by investigating the effect of shear on steady-state floc sizes. The technique is based on a method developed to investigate flocculation of inorganic particles. Samples of activated sludge are sonicated for 3 min at 50 W to produce the necessary primary particles to observe flocculation. The samples are then stirred in a batch mixing vessel and sized on-line using a Malvern Mastersizer/E. The dynamics of flocculation were found to be reproducible and follow the principles of inorganic shear induced flocculation. The median flee size was found to increase until an equilibrium between the rates of aggregation and breakage was reached. At this point, a steady-state floc size was maintained. The effect of shear on the steady-state flee size was quantified using the experimental technique. The change in floc size-with shear followed a power law relationship. This relationship was used to investigate the breakage mechanisms. (C) 2000 Elsevier Science Ltd. All rights reserved.
Keyword Engineering, Environmental
Environmental Sciences
Water Resources
Flocculation
Floc Size
Shear
Sonication
Physical Characteristics
Breakup
Aggregation
Extraction
Particles
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: Advanced Water Management Centre Publications
 
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