The rheological behaviour of anaerobic digested sludge
Identifieur interne : 006615 ( Main/Exploration ); précédent : 006614; suivant : 006616The rheological behaviour of anaerobic digested sludge
Auteurs : J. C. Baudez [France, Australie] ; F. Markis [Australie] ; N. Eshtiaghi [Australie] ; P. Slatter [Australie]Source :
- Water research : (Oxford) [ 0043-1354 ] ; 2011.
Descripteurs français
- Pascal (Inist)
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English descriptors
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Abstract
Producing biogas energy from the anaerobic digestion of wastewater sludge is one of the most challenging tasks facing engineers, because they are dealing with vast quantities of fundamentally scientifically poorly understood and unpredictable materials; while digesters need constant flow properties to operate efficiently. An accurate estimate of sludge rheological properties is required for the design and efficient operation of digestion, including mixing and pumping. In this paper, we have determined the rheological behaviour of digested sludge at different concentrations, and highlighted common features. At low shear stress, digested sludge behaves as a linear viscoelastic solid, but shear banding can occur and modify the apparent behaviour. At very high shear stress, the behaviour fits well to the Bingham model. Finally, we show that the rheological behaviour of digested sludge is qualitatively the same at different solids concentrations, and depends only on the yield stress and Bingham viscosity, both parameters being closely linked to the solids concentration.
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C." last="Baudez">J. C. Baudez</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Cemagref, UR TSCF</s1><s2>03150 Montoldre</s2><s3>FRA</s3><sZ>1 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Auvergne-Rhône-Alpes</region><region type="old region" nuts="2">Auvergne (région administrative)</region><settlement type="city">Montoldre</settlement></placeName></affiliation><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Rheology and Materials Processing Centre, Dept. of Chemical Engineering, RMIT University</s1><s2>Victoria 3001</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Victoria 3001</wicri:noRegion></affiliation></author><author><name sortKey="Markis, F" sort="Markis, F" uniqKey="Markis F" first="F." last="Markis">F. Markis</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Rheology and Materials Processing Centre, Dept. of Chemical Engineering, RMIT University</s1><s2>Victoria 3001</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Victoria 3001</wicri:noRegion></affiliation></author><author><name sortKey="Eshtiaghi, N" sort="Eshtiaghi, N" uniqKey="Eshtiaghi N" first="N." last="Eshtiaghi">N. Eshtiaghi</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Rheology and Materials Processing Centre, Dept. of Chemical Engineering, RMIT University</s1><s2>Victoria 3001</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Victoria 3001</wicri:noRegion></affiliation></author><author><name sortKey="Slatter, P" sort="Slatter, P" uniqKey="Slatter P" first="P." last="Slatter">P. Slatter</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Rheology and Materials Processing Centre, Dept. of Chemical Engineering, RMIT University</s1><s2>Victoria 3001</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Victoria 3001</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Water research : (Oxford)</title><title level="j" type="abbreviated">Water res. : (Oxf.)</title><idno type="ISSN">0043-1354</idno><imprint><date when="2011">2011</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Water research : (Oxford)</title><title level="j" type="abbreviated">Water res. : (Oxf.)</title><idno type="ISSN">0043-1354</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Anaerobic digestion</term><term>Biogas</term><term>Biological treatment</term><term>Modeling</term><term>Pumping</term><term>Rheological properties</term><term>Sewage sludge</term><term>Shear stress</term><term>Viscosity</term><term>Waste water</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Digestion anaérobie</term><term>Boue résiduaire</term><term>Biogaz</term><term>Eau usée</term><term>Propriété rhéologique</term><term>Pompage</term><term>Contrainte cisaillement</term><term>Modélisation</term><term>Viscosité</term><term>Traitement biologique</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Biogaz</term><term>Eau usée</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Producing biogas energy from the anaerobic digestion of wastewater sludge is one of the most challenging tasks facing engineers, because they are dealing with vast quantities of fundamentally scientifically poorly understood and unpredictable materials; while digesters need constant flow properties to operate efficiently. An accurate estimate of sludge rheological properties is required for the design and efficient operation of digestion, including mixing and pumping. In this paper, we have determined the rheological behaviour of digested sludge at different concentrations, and highlighted common features. At low shear stress, digested sludge behaves as a linear viscoelastic solid, but shear banding can occur and modify the apparent behaviour. At very high shear stress, the behaviour fits well to the Bingham model. Finally, we show that the rheological behaviour of digested sludge is qualitatively the same at different solids concentrations, and depends only on the yield stress and Bingham viscosity, both parameters being closely linked to the solids concentration.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li></country><region><li>Auvergne (région administrative)</li><li>Auvergne-Rhône-Alpes</li></region><settlement><li>Montoldre</li></settlement></list><tree><country name="France"><region name="Auvergne-Rhône-Alpes"><name sortKey="Baudez, J C" sort="Baudez, J C" uniqKey="Baudez J" first="J. C." last="Baudez">J. C. Baudez</name></region></country><country name="Australie"><noRegion><name sortKey="Baudez, J C" sort="Baudez, J C" uniqKey="Baudez J" first="J. C." last="Baudez">J. C. Baudez</name></noRegion><name sortKey="Eshtiaghi, N" sort="Eshtiaghi, N" uniqKey="Eshtiaghi N" first="N." last="Eshtiaghi">N. Eshtiaghi</name><name sortKey="Markis, F" sort="Markis, F" uniqKey="Markis F" first="F." last="Markis">F. Markis</name><name sortKey="Slatter, P" sort="Slatter, P" uniqKey="Slatter P" first="P." last="Slatter">P. Slatter</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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