Rheological characterisation of thermally-treated anaerobic digested sludge: Impact of temperature and thermal history
Identifieur interne : 000109 ( PascalFrancis/Checkpoint ); précédent : 000108; suivant : 000110Rheological characterisation of thermally-treated anaerobic digested sludge: Impact of temperature and thermal history
Auteurs : Ehsan Farno [Australie] ; Jean Christophe Baudez [France] ; Rajarathinam Parthasarathy [Australie] ; Nicky Eshtiaghi [Australie]Source :
- Water research : (Oxford) [ 0043-1354 ] ; 2014.
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Abstract
This study investigated the partially irreversible effect of thermal treatment on the rheology of digested sludge when it was subjected to temperature change between 20 °C and 80 °C and then cooled down to 20 °C. The yield stress, infinite viscosity and liquor viscosity of sludge were measured at 20 °C for different thermal histories and were compared to the evolution of the solubilised chemical oxygen demand (COD) of sludge liquor. The results showed that thermal history irreversibly affects sludge rheology as the yield stress of sludge which was heated to 80 °C then cooled down to 20 °C was 68% lower than the initial yield stress at 20 °C. This decrease was due to the irreversible solubilisation of solid matter during heating as underlined by soluble COD data which did not reach its original level after thermal treatment. Measured soluble COD of sludge which was heated and cooled down was much higher than the soluble COD of initial sludge. We found a proportionality of the increase of soluble COD with the decrease of the yield stress as well as increase of infinite viscosity.
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(RMPC), Civil Environmental and Chemical Eng. Department, RMIT University</s1><s2>Victoria 3001</s2><s3>AUS</s3><sZ>1 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, Nicky" sort="Eshtiaghi, Nicky" uniqKey="Eshtiaghi N" first="Nicky" last="Eshtiaghi">Nicky Eshtiaghi</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Rheology and Material Processing Lab. (RMPC), Civil Environmental and Chemical Eng. 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(RMPC), Civil Environmental and Chemical Eng. Department, RMIT University</s1><s2>Victoria 3001</s2><s3>AUS</s3><sZ>1 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, Nicky" sort="Eshtiaghi, Nicky" uniqKey="Eshtiaghi N" first="Nicky" last="Eshtiaghi">Nicky Eshtiaghi</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Rheology and Material Processing Lab. (RMPC), Civil Environmental and Chemical Eng. Department, RMIT University</s1><s2>Victoria 3001</s2><s3>AUS</s3><sZ>1 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="2014">2014</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>Heat treatment</term><term>Rheological properties</term><term>Sewage sludge</term><term>Temperature effect</term><term>Thermal history</term><term>Viscosity</term><term>Waste treatment</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Traitement déchet</term><term>Boue résiduaire</term><term>Propriété rhéologique</term><term>Viscosité</term><term>Traitement thermique</term><term>Effet température</term><term>Histoire thermique</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">This study investigated the partially irreversible effect of thermal treatment on the rheology of digested sludge when it was subjected to temperature change between 20 °C and 80 °C and then cooled down to 20 °C. The yield stress, infinite viscosity and liquor viscosity of sludge were measured at 20 °C for different thermal histories and were compared to the evolution of the solubilised chemical oxygen demand (COD) of sludge liquor. The results showed that thermal history irreversibly affects sludge rheology as the yield stress of sludge which was heated to 80 °C then cooled down to 20 °C was 68% lower than the initial yield stress at 20 °C. This decrease was due to the irreversible solubilisation of solid matter during heating as underlined by soluble COD data which did not reach its original level after thermal treatment. Measured soluble COD of sludge which was heated and cooled down was much higher than the soluble COD of initial sludge. We found a proportionality of the increase of soluble COD with the decrease of the yield stress as well as increase of infinite viscosity.</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0043-1354</s0></fA01><fA02 i1="01"><s0>WATRAG</s0></fA02><fA03 i2="1"><s0>Water res. : (Oxf.)</s0></fA03><fA05><s2>56</s2></fA05><fA08 i1="01" i2="1" l="ENG"><s1>Rheological characterisation of thermally-treated anaerobic digested sludge: Impact of temperature and thermal history</s1></fA08><fA11 i1="01" i2="1"><s1>FARNO (Ehsan)</s1></fA11><fA11 i1="02" i2="1"><s1>BAUDEZ (Jean Christophe)</s1></fA11><fA11 i1="03" i2="1"><s1>PARTHASARATHY (Rajarathinam)</s1></fA11><fA11 i1="04" i2="1"><s1>ESHTIAGHI (Nicky)</s1></fA11><fA14 i1="01"><s1>Rheology and Material Processing Lab. (RMPC), Civil Environmental and Chemical Eng. 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