Predicting the apparent viscosity and yield stress of mixtures of primary, secondary and anaerobically digested sewage sludge: Simulating anaerobic digesters.
Identifieur interne : 001921 ( Main/Exploration ); précédent : 001920; suivant : 001922Predicting the apparent viscosity and yield stress of mixtures of primary, secondary and anaerobically digested sewage sludge: Simulating anaerobic digesters.
Auteurs : Flora Markis [Australie] ; Jean-Christophe Baudez [France] ; Rajarathinam Parthasarathy [Australie] ; Paul Slatter [Australie] ; Nicky Eshtiaghi [Australie]Source :
- Water research [ 1879-2448 ] ; 2016.
Descripteurs français
- KwdFr :
- MESH :
English descriptors
- KwdEn :
- MESH :
- chemical : Sewage.
- Hydrodynamics, Models, Theoretical, Rheology, Viscosity.
Abstract
Predicting the flow behaviour, most notably, the apparent viscosity and yield stress of sludge mixtures inside the anaerobic digester is essential because it helps optimize the mixing system in digesters. This paper investigates the rheology of sludge mixtures as a function of digested sludge volume fraction. Sludge mixtures exhibited non-Newtonian, shear thinning, yield stress behaviour. The apparent viscosity and yield stress of sludge mixtures prepared at the same total solids concentration was influenced by the interactions within the digested sludge and increased with the volume fraction of digested sludge - highlighted using shear compliance and shear modulus of sludge mixtures. However, when a thickened primary - secondary sludge mixture was mixed with dilute digested sludge, the apparent viscosity and yield stress decreased with increasing the volume fraction of digested sludge. This was caused by the dilution effect leading to a reduction in the hydrodynamic and non-hydrodynamic interactions when dilute digested sludge was added. Correlations were developed to predict the apparent viscosity and yield stress of the mixtures as a function of the digested sludge volume fraction and total solids concentration of the mixtures. The parameters of correlations can be estimated using pH of sludge. The shear and complex modulus were also modelled and they followed an exponential relationship with increasing digested sludge volume fraction.
DOI: 10.1016/j.watres.2016.05.045
PubMed: 27243386
Affiliations:
- Australie, France
- Auvergne (région administrative), Auvergne-Rhône-Alpes, Victoria (État)
- Melbourne, Montoldre
Links toward previous steps (curation, corpus...)
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- to stream Ncbi, to step Merge: 003612
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Le document en format XML
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This paper investigates the rheology of sludge mixtures as a function of digested sludge volume fraction. Sludge mixtures exhibited non-Newtonian, shear thinning, yield stress behaviour. The apparent viscosity and yield stress of sludge mixtures prepared at the same total solids concentration was influenced by the interactions within the digested sludge and increased with the volume fraction of digested sludge - highlighted using shear compliance and shear modulus of sludge mixtures. However, when a thickened primary - secondary sludge mixture was mixed with dilute digested sludge, the apparent viscosity and yield stress decreased with increasing the volume fraction of digested sludge. This was caused by the dilution effect leading to a reduction in the hydrodynamic and non-hydrodynamic interactions when dilute digested sludge was added. Correlations were developed to predict the apparent viscosity and yield stress of the mixtures as a function of the digested sludge volume fraction and total solids concentration of the mixtures. The parameters of correlations can be estimated using pH of sludge. The shear and complex modulus were also modelled and they followed an exponential relationship with increasing digested sludge volume fraction.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li></country><region><li>Auvergne (région administrative)</li><li>Auvergne-Rhône-Alpes</li><li>Victoria (État)</li></region><settlement><li>Melbourne</li><li>Montoldre</li></settlement></list><tree><country name="Australie"><region name="Victoria (État)"><name sortKey="Markis, Flora" sort="Markis, Flora" uniqKey="Markis F" first="Flora" last="Markis">Flora Markis</name></region><name sortKey="Eshtiaghi, Nicky" sort="Eshtiaghi, Nicky" uniqKey="Eshtiaghi N" first="Nicky" last="Eshtiaghi">Nicky Eshtiaghi</name><name sortKey="Parthasarathy, Rajarathinam" sort="Parthasarathy, Rajarathinam" uniqKey="Parthasarathy R" first="Rajarathinam" last="Parthasarathy">Rajarathinam Parthasarathy</name><name sortKey="Slatter, Paul" sort="Slatter, Paul" uniqKey="Slatter P" first="Paul" last="Slatter">Paul Slatter</name></country><country name="France"><region name="Auvergne-Rhône-Alpes"><name sortKey="Baudez, Jean Christophe" sort="Baudez, Jean Christophe" uniqKey="Baudez J" first="Jean-Christophe" last="Baudez">Jean-Christophe Baudez</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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