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Effects of physico-chemical factors on the viscosity evolution of anaerobic granular sludge

Paper ID Volume ID Publish Year Pages File Format Full-Text
4070 207 2009 8 PDF Available
Title
Effects of physico-chemical factors on the viscosity evolution of anaerobic granular sludge
Abstract

The rheological properties of anaerobic granular sludge samples from four full-scale and one lab-scale anaerobic bioreactors were characterized by determining their “limit viscosity” values. These values were deducted from the evolution of the apparent viscosity of granular sludge samples (20 mL) at steady shear rate (200 s−1) recorded using rotation tests with a wings type measurement cell stirrer Anton-Parr reference: ST24-1D/2V-Q0. The limit viscosity values depended on the applied shear rate, indicating a non-Newtonian behavior of the anaerobic granular sludge types investigated. The effect of variations of physico-chemical parameters such as pH (involving surface charge change), size, surface roughness and TSS content on the evolution of the limit viscosity of an anaerobic granular sludge suspension was investigated. This showed the importance of both quantitative (number of particles in a given volume) as well as qualitative (surface charge or shape) granule-granule interactions on this rheological parameter. Moreover, the origin of the granular sludge strongly influenced the limit viscosity value according with different granules characteristics. This work confirms the ability of the rheological parameter “limit viscosity” as an overall parameter to describe the physico-chemical characteristics (TSS, granulometry, origin, and charge) of anaerobic granular sludge and showed this holds for both sieved (500 μm) and unsieved sludges.

Keywords
Rheology; Viscosity; Anaerobic granular sludge
First Page Preview
Effects of physico-chemical factors on the viscosity evolution of anaerobic granular sludge
Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 43, Issue 3, 15 March 2009, Pages 231–238
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering