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- W2008188144 abstract "L’objectif de ce travail consistait àmontrer l’effet de la concentration en solides des boues sur le procédéde biolixiviation des métaux pour stabiliser et améliorer ces boues en utilisant le soufre élémentaire comme substrat. Deux séries d’essais ont étéréalisées en cultures discontinues, en bioréacteurs (type colonne), utilisant du soufre sous forme de blocs de 25 mm de diamètre, et contenant 12 litres d’un mélange de 80% de boues primaires et de 20% de boues secondaires (sur une base de matières sèches) provenant de la station d’épuration des eaux usées de la base militaire de Valcartier (Québec, Canada). Les concentrations en matières en suspension (MES) des différentes boues augmentaient de 8 à27 g/l pour les deux séries d’essais (B et B’: huit concentrations par série). Les résultats obtenus lors de la biolixiviation montraient que la vitesse d’acidification diminuait, alors que la production de sulfates augmentait, lorsque la concentration en solides des boues augmentait. La réduction apparente des MES et des MVS (matières volatiles en suspension) des boues lixiviées était nettement supérieure àcelle obtenue pour les boues stabilisées aérobies (témoins), et les valeurs de la constante de dégradation des matières biodégradables (kd) décroissaient linéairement lorsque la concentration en MES augmentait. Les taux de solubilisation des différents métaux, lors de la biolixiviation-stabilisation diminuaient, lorsque les concentrations en solides des boues augmentaient et étaient pour: Cd, 43 à79%; Cr, 22 à38%; Cu, 75 à97%; Fe, 40 à54%; Mn, 88 à98%; Ni, 25 à40%; Pb, 37 à89%; Zn, 76 à100%; P, 30 à34%; K, 47 à60%. Le choix de la forme de soufre conduit àla formation, dans certains endroits du bioréacteur, de zones anoxiques oùse produit un phénomène de dénitrification effectuépar les bactéries àrespiration anaérobie. Alors que la concentration en potassium soluble diminue généralement, le phosphore et l’azote ammoniacal passent en solution en fin de biolixiviation. Malgréces changements, la phase solide des boues lixiviées garde presque entièrement ses valeurs fertilisantes. The objective of this work was to determine the effects of various concentrations of solid sludge on the bioleaching of metals and the stabilisation of sludge using elemental sulphur as a substrate to remove metals by an acid bioleaching process. Two experimental series were carried out in batch cultures, in column-type bioreactors, using sulphur in the form of 25 mm diameter blocks, in a 12-litre mixture which contained 80% of primary and 20% of secondary sludge (on a dry weight basis). Both sludge types came from the waste water treatment centre of the Valcartier military base (Quebec, Canada). The suspended solids (SS) concentrations (g/l) of the first and second series (B and B’): ranged from 8 to 27 g/l, respectively, with eight concentrations per series. The results obtained during the bioleaching–stabilisation process show that the acidification rate was reduced, that the quantity of sulphate produced increased with the sludge solid concentration. But the reduction in SS and volatile suspended solids (VSS) of the leached sludge was greater than that obtained by stabilising the sludge aerobically (control). The value of the degradation constant (kd) decreased in response to the increase in VSS. The solubilisation rates of different metals during the bioleaching stabilisation decreased as the sludge solid concentrations increased and were as follows: Cd 43–79%; Cr 22–38%; Cu 75–97%; Fe 40–54%; Mn 88–98%; Ni 25–40%; Pb 37–89%; Zn 76–100%; P 30–34%; K 47–60%. The use of sulphur in the form of blocks leads to the formation of anoxic zones in certain regions of the bioreactor, favouring bacterial denitrification. Soluble concentrations of potassium were reduced by the end of the bioleaching process, whereas soluble concentrations of phosphorus and ammonium nitrogen increased. Despite these changes, the fertilizer values of the solid phase of these sludge types were effectively preserved." @default.
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- W2008188144 title "Simultaneous sewage sludge digestion and metal leaching using an internal loop reactor: effect of suspended solids concentration" @default.
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