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Hysteresis area, a rheological parameter used as a tool to assess the ability of filamentous sludges to settle

Paper ID Volume ID Publish Year Pages File Format Full-Text
36454 45133 2005 6 PDF Available
Title
Hysteresis area, a rheological parameter used as a tool to assess the ability of filamentous sludges to settle
Abstract

The activated sludge process is the most widely used biological wastewater treatment method. The measurement of some physico-chemical parameters in aeration tanks does not allow clarification operation failures to be avoided. This study focuses on the determination of a rheological parameter of filamentous activated sludge at standard concentrations (2–7 g L−1) in order to assess sludge settleability. On filamentous sludges, rheological measurements in shear flow display a hysteresis area (or reduced hysteresis area (rHa) when the volume of sludge considered is 1 mL), which corresponds to the presence of filamentous bacteria in the sludges. In numerous cases of filamentous activated sludges, significant relationships with the zone settlement velocity (ZSV) parameters of settleability point out that hysteresis area could be used to predict the ability of filamentous activated sludges to settle. With the protocol used, a filamentous activated sludge with a rHa >20 Pa s−1 mL−1, always showed a very low or null ability to settle whatever the value of activated sludge total suspended solid (TSS) content over a standard range (2–7 g L−1)

Keywords
Rheology; Activated sludge; Settleability; Hysteresis area
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Hysteresis area, a rheological parameter used as a tool to assess the ability of filamentous sludges to settle
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 40, Issue 8, July 2005, Pages 2671–2676
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
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us