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• W2238853329 abstract "RESUME Les deux objectifs de ce projet etaient de proposer un systeme de traitement par filtres a scories du lixiviat de la mine Joplin, Missouri et de proposer un modele preliminaire des mecanismes de retention du phosphore dans les filtres a scories. Trois phases experimentales ont ete realisees : essais individuels en flacon, essais sequentiels en flacon et essais en colonnes. Les essais individuels en flacon ont ete utilises pour comparer la performance de traitement de 10 scories et 1 apatite et pour choisir les meilleurs materiaux parmi ceux-ci. Les essais sequentiels en flacon ont ete utilises pour comparer les performances de traitement de quelques sequences de filtres. Finalement, les essais en colonnes ont ete utilises pour caracteriser la performance d’enlevement et la longevite d’un filtre soumis a des conditions d’alimentation controlees. Durant les essais en colonnes, l’effet de la composition de l’affluent, du temps de retention hydraulique des vides et de la sequence de filtre a ete mesure. Certains essais en colonnes ont ete operes specifiquement pour etudier les mecanismes d’enlevement du phosphore.Le modele propose est defini par les etapes suivantes : 1) la dissolution cinetique des scories est representee par la dissolution de CaO, 2) un fort pH dans le filtre cause la precipitation du phosphore et la croissance de cristaux, 3) la retention des cristaux est causee par filtration, decantation et densification, 4) la diminution du volume de reaction (et du temps de reaction) disponible est causee par l’accumulation de cristaux et autres particules dans les vides, 5) le pH dans le filtre diminue avec le temps si le temps de reaction est trop court (ce qui resulte en une diminution de l’efficacite d’enlevement). Une nouvelle approche pour definir les performances des filtres a scories est proposee. La capacite de retention a saturation est exprimee en mg P / mL de vides.Le systeme propose pour traiter le lixiviat de la mine Joplin est compose de deux filtres successifs de scories EAF Fort Smith operes a un temps de retention hydraulique des vides total de 34 h. Apres 179 jours d’operation, les performances de traitement des deux filtres ont ete de 99.9 %, 85.3 %, 98.0 % et 99.3 % pour le phosphore, le fluor, le manganese et le zinc, respectivement.----------ABSTRACT The two objectives of this project were to propose a slag filters treatment system for the leachate of the Joplin mine, Missouri, and propose a preliminary model for phosphorus removal mechanisms in slag filters. Three experimental phases were realized: individual batch tests, sequential batch tests and column tests. Individual batch tests were used to compare the treatment performance of 10 slags and 1 apatite and to select the best materials from this list. Sequential batch tests were used to compare the treatment performance of several filter sequences. Finally, column tests were used to characterize the removal performance and longevity of controlled filters. During column tests, the effect of influent composition, void hydraulic retention time and filter sequences was measured. Some column tests were operated especially for the study of phosphorus removal mechanisms.The proposed model is expressed by the following steps: 1) the rate limiting dissolution of slag is represented by the dissolution of CaO, 2) a high pH in the slag filter results in phosphorus precipitation and crystal growth, 3) crystal retention takes place by filtration, settling and growth densification, 4) the decrease in available reaction volume is caused by crystal and other particulate matter accumulation (and an associated decrease in available reaction time), and 5) the pH decreases in the filter over time if the reaction time is too short (which results in a reduced removal efficiency). A new approach to define filter performance is proposed. Saturation retention capacity is expressed in units of mg P/ mL voids.The proposed system for the treatment of the Joplin mine leachate is composed of two successive Fort Smith EAF slag filters operated at a total void hydraulic retention time of 34 hours. After 179 days of operation, the treatment performance of this system was 99.9 %, 85.3 %, 98.0 % et 99.3 % for phosphorus, fluoride, manganese and zinc respectively." @default.
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• W2238853329 date "2012-06-01" @default.
• W2238853329 modified "2023-09-27" @default.
• W2238853329 title "Mining Wastewater Treatment by Slag Filters" @default.
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