Experimental and theoretical study of recovery processes of olive by-products by thermal and physico-chemical paths
Identifieur interne : 000018 ( Hal/Checkpoint ); précédent : 000017; suivant : 000019Experimental and theoretical study of recovery processes of olive by-products by thermal and physico-chemical paths
Auteurs : Ajmia Chouchene [France]Source :
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Abstract
In Tunisia, oil extraction industry generates high amount of two by-products: an aqueous effluent (Olive Mill WasteWater) and a solid residue (Olive Mill Solid Waste). Two recovery pathways (thermal and physicochemical) were performed to reduce these wastes. Firstly, a combined process which includes impregnation on low-cost renewable absorbents and an energetic recovery via combustion was studied. Olive Mill Solid Waste (OMSW) and sawdust were chosen as absorbent of OMWW. During combustion tests, carbon balance increases with temperature increasing followed by an increase of CO and VOC emissions. Nevertheless, it was necessary to increase the residence time of gas in order to reduce the unburned compounds in the exhaust. This process may be a promising issue to reduce OMWW environmental impact. The mixture of OMSW/ OMWW with mass ratio of OMWW close to 28%wt shows a similar behaviour to original OMSW under inert and oxidative atmospheres. It seems that the use of this mixture of OMSW/OMWW may be a solution for Tunisia since the resource is abundant and may increase farm yields. The physico-chemical way of OMSW recovery focused on the removal of nickel and copper from wastewaters. The trapping of these metals in the ash reveals that nickel and copper are low volatilized. Moreover, these metals are not soluble during leaching. Consequently, their transfer to the atmosphere and the environment is minimal.
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Two recovery pathways (thermal and physicochemical) were performed to reduce these wastes. Firstly, a combined process which includes impregnation on low-cost renewable absorbents and an energetic recovery via combustion was studied. Olive Mill Solid Waste (OMSW) and sawdust were chosen as absorbent of OMWW. During combustion tests, carbon balance increases with temperature increasing followed by an increase of CO and VOC emissions. Nevertheless, it was necessary to increase the residence time of gas in order to reduce the unburned compounds in the exhaust. This process may be a promising issue to reduce OMWW environmental impact. The mixture of OMSW/ OMWW with mass ratio of OMWW close to 28%wt shows a similar behaviour to original OMSW under inert and oxidative atmospheres. It seems that the use of this mixture of OMSW/OMWW may be a solution for Tunisia since the resource is abundant and may increase farm yields. The physico-chemical way of OMSW recovery focused on the removal of nickel and copper from wastewaters. The trapping of these metals in the ash reveals that nickel and copper are low volatilized. Moreover, these metals are not soluble during leaching. Consequently, their transfer to the atmosphere and the environment is minimal.</div></front></TEI><hal api="V3"><titleStmt><title xml:lang="en">Experimental and theoretical study of recovery processes of olive by-products by thermal and physico-chemical paths</title><title xml:lang="fr">Etude expérimentale et théorique de procédés de valorisation de sous-produtis oléicoles par voies thermique et physico-chimique</title><author role="aut"><persName><forename type="first">Ajmia</forename><surname>Chouchene</surname></persName><idno type="halauthorid">729550</idno><affiliation ref="#struct-109941"></affiliation></author><editor role="depositor"><persName><forename>ABES</forename><surname>STAR</surname></persName><email type="md5">f5aa7f563b02bb6adbba7496989af39a</email><email type="domain">abes.fr</email></editor></titleStmt><editionStmt><edition n="v1" type="current"><date type="whenSubmitted">2012-06-04 12:22:24</date><date type="whenModified">2012-06-25 15:14:12</date><date type="whenReleased">2012-06-05 13:48:15</date><date type="whenProduced">2010-12-06</date><date type="whenEndEmbargoed">2012-06-04</date><ref type="file" target="https://tel.archives-ouvertes.fr/tel-00703759/document"><date notBefore="2012-06-04"></date></ref><ref type="file" subtype="author" n="1" target="https://tel.archives-ouvertes.fr/tel-00703759/file/2010MULH4891_these_CHOUCHENE.pdf"><date notBefore="2012-06-04"></date></ref></edition><respStmt><resp>contributor</resp><name key="131274"><persName><forename>ABES</forename><surname>STAR</surname></persName><email type="md5">f5aa7f563b02bb6adbba7496989af39a</email><email type="domain">abes.fr</email></name></respStmt></editionStmt><publicationStmt><distributor>CCSD</distributor><idno type="halId">tel-00703759</idno><idno type="halUri">https://tel.archives-ouvertes.fr/tel-00703759</idno><idno type="halBibtex">chouchene:tel-00703759</idno><idno type="halRefHtml">Alimentation et Nutrition. Université de Haute Alsace - Mulhouse, 2010. Français. <NNT : 2010MULH4891></idno><idno type="halRef">Alimentation et Nutrition. Université de Haute Alsace - Mulhouse, 2010. Français. <NNT : 2010MULH4891></idno></publicationStmt><seriesStmt><idno type="stamp" n="STAR">STAR - Dépôt national des thèses électroniques</idno></seriesStmt><notesStmt></notesStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Experimental and theoretical study of recovery processes of olive by-products by thermal and physico-chemical paths</title><title xml:lang="fr">Etude expérimentale et théorique de procédés de valorisation de sous-produtis oléicoles par voies thermique et physico-chimique</title><author role="aut"><persName><forename type="first">Ajmia</forename><surname>Chouchene</surname></persName><idno type="halauthorid">729550</idno><affiliation ref="#struct-109941"></affiliation></author></analytic><monogr><idno type="nnt">2010MULH4891</idno><imprint><date type="dateDefended">2010-12-06</date></imprint><authority type="institution">Université de Haute Alsace - Mulhouse</authority><authority type="school">École Doctorale Jean-Henri Lambert</authority><authority type="supervisor">Gwenaelle Trouve</authority></monogr></biblStruct></sourceDesc><profileDesc><langUsage><language ident="fr">French</language></langUsage><textClass><keywords scheme="author"><term xml:lang="en">Olive Mill WasteWater</term><term xml:lang="en">Olive Mill Solid Waste</term><term xml:lang="en">Pyrolysis</term><term xml:lang="en">Combustion</term><term xml:lang="en">Emissions</term><term xml:lang="en">Kinetic</term><term xml:lang="en">Absorption</term><term xml:lang="en">Metals</term><term xml:lang="fr">Cinétique</term><term xml:lang="fr">Métaux</term><term xml:lang="fr">Grignons d'olives</term><term xml:lang="fr">Margines</term><term xml:lang="fr">Pyrolyse</term></keywords><classCode scheme="halDomain" n="sdv.aen">Life Sciences [q-bio]/Food and Nutrition</classCode><classCode scheme="halTypology" n="THESE">Theses</classCode></textClass><abstract xml:lang="en">In Tunisia, oil extraction industry generates high amount of two by-products: an aqueous effluent (Olive Mill WasteWater) and a solid residue (Olive Mill Solid Waste). Two recovery pathways (thermal and physicochemical) were performed to reduce these wastes. Firstly, a combined process which includes impregnation on low-cost renewable absorbents and an energetic recovery via combustion was studied. Olive Mill Solid Waste (OMSW) and sawdust were chosen as absorbent of OMWW. During combustion tests, carbon balance increases with temperature increasing followed by an increase of CO and VOC emissions. Nevertheless, it was necessary to increase the residence time of gas in order to reduce the unburned compounds in the exhaust. This process may be a promising issue to reduce OMWW environmental impact. The mixture of OMSW/ OMWW with mass ratio of OMWW close to 28%wt shows a similar behaviour to original OMSW under inert and oxidative atmospheres. It seems that the use of this mixture of OMSW/OMWW may be a solution for Tunisia since the resource is abundant and may increase farm yields. The physico-chemical way of OMSW recovery focused on the removal of nickel and copper from wastewaters. The trapping of these metals in the ash reveals that nickel and copper are low volatilized. Moreover, these metals are not soluble during leaching. Consequently, their transfer to the atmosphere and the environment is minimal.</abstract><abstract xml:lang="fr">En Tunisie, l'extraction d'huile d'olives génère d'énormes quantités de sous-produits oléicoles : les grignons d'olives et les margines. De ce fait, la valorisation de ces sous-produits par deux voies (thermique et physicochimique) a été réalisée. Le premier volet concerne une nouvelle alternative qui consiste à utiliser les margines en mélange avec une matrice solide pour constituer un combustible de biomasse. La sciure et les grignons d'olives (GO) ont été choisis comme matrice d'absorption à moindre coût. Lors des essais de combustion, le bilan de carbone augmente avec l'augmentation de température, accompagné d'une augmentation du monoxyde de carbone et des composés organiques volatils. Toutefois, il a été mis en évidence la nécessité de travailler avec un temps de séjour plus élevé pour minimiser l'émission des imbrûlés. Ce procédé d'imprégnation est une technique prometteuse de réduction des impacts environnementaux de margines. Le mélange GO/margines ayant un taux d'imprégnation ≤ à 28% a montré un comportement similaire à ceux des grignons d'olives sous inerte et sous air. L'utilisation de ce mélange GO/margines semble être une solution pour la Tunisie puisque la ressource est présente et permettra d'augmenter les rendements des exploitations. Quant à la valorisation physicochimique des grignons d'olives, elle a été dédiée à l'étude de l'adsorption du nickel et du cuivre. L'étude de piégeage de ces métaux dans les cendres a révélé que le nickel et le cuivre se volatilisent peu ou ne se volatilisent pas. Ces métaux sont très faiblement solubles par lixiviation des cendres. En conséquence, le transfert vers l'atmosphère et l'environnement est alors inexistant ou minimal.</abstract></profileDesc></hal></record>Pour manipuler ce document sous Unix (Dilib)
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