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Responses of sludge flocs to shear strength

Paper ID Volume ID Publish Year Pages File Format Full-Text
36648 45139 2005 5 PDF Available
Title
Responses of sludge flocs to shear strength
Abstract

The effect of shear strength measured in agitation rate ranging from 50 to 800 rpm on physical properties and metabolism of microbial cells was investigated using activated sludge flocs. The response of microbial cells to varying external shear strength was monitored in terms of sludge particle size, settling properties, cell surface hydrophobicity, and metabolic behavior measured as carbon dioxide (CO2) production, oxygen (O2) utilization rate, and sludge production rate. Exopolysaccharide production of the microbial cells increased with shear strength, while the sludge production rate decreased with the shear strength. In addition to stimulate CO2 production, shear strength could also induce the change of cell surface hydrophobicity. A higher cell surface hydrophobicity, larger floc size, and lower sludge volume index (SVI) were observed at mild shear strength when sludge flocs were agitated at a rate of 400–600 rpm. The results suggested that the metabolic behavior of microbial cells may change in respond to applied shear strength, which results in a subsequent change in physical properties of the sludge flocs. It can be concluded that mild shear strength is likely to exert a favourable influence on the cell attachment, leading to the growth of settable biological flocs.

Keywords
Cell hydrophobicity; Exopolysaccharides; Metabolism; Physical properties of sludge flocs; Shear strength
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 40, Issue 10, October 2005, Pages 3213–3217
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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Any Questions? feel free to contact us