Title of article :
Determination of some rheological parameters for the characterization of activated sludge
Author/Authors :
N. Tixier، نويسنده , , G. Guibaud، نويسنده , , M. Baudu، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2003
Pages :
6
From page :
215
To page :
220
Abstract :
The rheological characterization of activated sludge originating from different aeration tanks and from a lab-scale plant was carried out using rotation tests. Two rheological parameters were used: limit viscosity (μ∞) and reduced hysteresis area (rHa). μ∞ was strongly influenced by the total suspended solids (TSS) content of sludge and an exponential relation was found between TSS and the rheological parameter μ∞. Significant differences in sludge viscosity were found for sludge of different origins, but all of 10 g/l TSS content, indicating ability of viscosity to show different sludge qualities. Marked changes in activated sludge microorganisms communities were shown to have an influence on rheological parameters. During aerobic digestion of sludge, variations in μ∞ were noticed, indicating change of sludge quality. An over-growth of filamentous bacteria species was shown to induce a particular rheological behavior which could be characterized by rHa. This parameter was proposed as an index of filamentous bacteria proliferation in activated sludge aeration tanks.
Keywords :
Activated sludge , Rheology , Viscosity limit , Filamentous bacteria , Reduced hysteresis area , Aerobic digestion
Journal title :
Bioresource Technology
Serial Year :
2003
Journal title :
Bioresource Technology
Record number :
411508
Link To Document :
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