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Rheological behaviors of anaerobic granular sludge in a spiral symmetry stream anaerobic bioreactor
- Source :
- Water Science and Technology. 72:658-664
- Publication Year :
- 2015
- Publisher :
- IWA Publishing, 2015.
-
Abstract
- The rheological behaviors of the anaerobic granular sludge (AGS) in a spiral symmetry stream anaerobic bioreactor (SSSAB) were investigated. Shear-thinning behavior, thixotropic behavior, concentration–viscosity behavior and temperature–viscosity behavior were evaluated based on the constitutive equation of the AGS. The results indicated that the Herschel–Bulkley model was able to adequately describe the constitutive relation of AGS in the SSSAB. The AGS also showed shear-thinning behavior as well as thixotropic behavior. The critical shear rate and network strength of the AGS were 61.8 s−1 and 497.0 W m−3, respectively. The relationship between the apparent viscosity and the sludge concentration was illustrated and explained by the Woodcock formula. The relationship between apparent viscosity of the AGS and temperature could be modeled using the Arrhenius equation. The AGS was significantly thermo-sensitive and its mean energy of activation was 14.640 kJ mol−1. Notably, it was necessary to consider such behaviors in the hydrodynamic modeling of SSSAB in which shear condition, sludge concentration and temperature were in non-uniform distribution.
- Subjects :
- Arrhenius equation
Thixotropy
Environmental Engineering
Sewage
Viscosity
Chemistry
Constitutive equation
Temperature
Thermodynamics
Activation energy
Models, Theoretical
Apparent viscosity
Waste Disposal, Fluid
Shear rate
symbols.namesake
Bioreactors
Rheology
symbols
Bioreactor
Geotechnical engineering
Anaerobiosis
Water Science and Technology
Subjects
Details
- ISSN :
- 19969732 and 02731223
- Volume :
- 72
- Database :
- OpenAIRE
- Journal :
- Water Science and Technology
- Accession number :
- edsair.doi.dedup.....9c9cc3de25f23af2cb0e129493e6bab1