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<dc:title xml:lang="fr">Traitement des boues de vidange par lits de séchage sous climat soudano-sahélien</dc:title>
<dcterms:alternative xml:lang="en">Treatment of faecal sludge on planted and unplanted bed in soudano-sahelian climate</dcterms:alternative>
<dc:subject xml:lang="fr">Filtre planté</dc:subject>
<dc:subject xml:lang="fr">Lit de séchage</dc:subject>
<dc:subject xml:lang="fr">Boues de vidange</dc:subject>
<dc:subject xml:lang="fr">Oryza longistaminata</dc:subject>
<dc:subject xml:lang="fr">Sporobolus pyramidalis</dc:subject>
<dc:subject xml:lang="fr">Cyperus alopecuroïdes</dc:subject>
<dc:subject xml:lang="fr">Déshydration</dc:subject>
<dc:subject xml:lang="fr">Modèle numérique</dc:subject>
<dc:subject xml:lang="fr">Équation de consolidation de Terzaghi</dc:subject>
<dc:subject xml:lang="en">Sludge treatment reed bed system</dc:subject>
<dc:subject xml:lang="en">Drying bed</dc:subject>
<dc:subject xml:lang="en">Faecal sludge</dc:subject>
<dc:subject xml:lang="en">Oryza longistaminata</dc:subject>
<dc:subject xml:lang="en">Sporobolus pyramidalis</dc:subject>
<dc:subject xml:lang="en">Cyperus alopecuroïdes</dc:subject>
<dc:subject xml:lang="en">Dewatering</dc:subject>
<dc:subject xml:lang="en">Numerical modeling</dc:subject>
<dc:subject xml:lang="en">Terzaghi consolidation equation</dc:subject>
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<tef:elementdEntree autoriteExterne="027221393" autoriteSource="Sudoc">Boues d'épuration</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="03563474X" autoriteSource="Sudoc">Eau -- Épuration -- Biofiltration</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">L'usage des lits de séchage plantés et non plantés (LSP et LSNP) pour le traitement des boues de vidange (BV) augmente en Afrique de l’Ouest malgré leurs performances parfois mauvaises et leur dimensionnement empirique. Pour contribuer à I'accès aux performances épuratoires des LSP et LSNP, le suivi de 13 lits de séchage expérimentaux a été réalisé. Sur la base de l'équation de consolidation de Terzaghi, un modèle, permettant de simuler I'humidité volumique des boues sur les lits, a été développé selon 2 approches. Les résultats montrent des performances épuratoires mitigées. Pour des valeurs seuils de concentrations de BV, les 3 espèces testées sur les LSP ont flétries. Les simulations avec l’Approche 1 présente des erreurs absolues relatives inférieures à 15% et sont meilleures que ceux avec l'approche 2. Cependant, I'approche 2 a l'avantage de reproduire les tendances de l'évolution des coefficients de consolidation et perméabilité des boues en fonction de la profondeur et du temps.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Despite the bad performances sometimes obtained according to the context and the empirical method of design, the use of drying beds (planted and not planted) for the treatment of faecal sludge (FS) increase in West Africa. To access to treatment performances in local context (Ouagadougou), the monitoring of 13 experimental drying beds were done. Based on the Terzaghi consolidation equation, the development of a numerical model were done according 2 approaches. Regarding removal efficiency, the performances of treatment of sludge on drying beds were mitigated. The results demonstrate that Oryza longistaminata, Sporobolus pyramidalis and Cyperus alopecuroïdes cannot be used in sludge drying planted beds for the treatment of FS. The simulations with the model in the approach 1 were better than those in approach 2. However, the approach 2 can reproduce the trends of volumetric moisture, the trends of consolidation coefficient and permeability as a function of depth and as a function of time.</dcterms:abstract>
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