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• W2068753479 abstract "Hydrodynamics and mass transfer characteristics of a three-phase airlift reactor were studied in a rectangular split-vessel reactor and using an air-seawater-marine sediment system. Experiments were conducted over a range of downcomer to riser cross-sectional area ratios (AD/AR = 0.65 to 1.0) for two-phase systems and for five sediment concentrations (5 to 25% w/v) using marine sediments. The influence of higher sediment concentrations (30 to 50% w/v) was examined for AD/AR = 1. The presence of fine sediment particles in the system had little effect on hydrodynamic and mass transfer parameters compared to the two-phase systems up to 25% loading, decreasing at higher loadings. The airlift reactor was found to meet the dissolved oxygen demand needed for a contaminated sediment treatment process. Axial distribution of the particles was uniform along the riser and the downcomer. Correlations were developed that described the hydrodynamic and mass transfer behaviour for all experimental conditions examined. On a étudié les caractéristiques de l'hydrodynamique et de transfert de matière d'un réacteur airlift triphasique dans un réacteur divisé rectangulaire pour un système air-eau de mer-sédiments marins. Les expériences ont été menées pour des rapports de sections de colonne ascendante sur colonne descendante (ADAR = 0,65 à 1,0) pour des systèmes biphasiques et cinq concentrations de sédiments (5 à 25% de w/v) composées de sédiments marins. L'influence de plus fortes concentrations de sédiments (30 – 50% de w/v) a été examinée pour ADAR = 1. La présence de fines particules de sédiments dans le système a eu peu d'effet sur les paramètres hydrodynamiques et de transfert de matière, comparativement aux systèmes biphasiques jusqu'à une charge de 25%, qui diminue à des charges plus élevées. On a trouvé que le réacteur airlift satisfaisait la demande en oxygène dissous nécessaire à un procédé de traitement de sédiments contaminés. La distribution axiale des particules était uniforme le long de la colonne montante et de la colonne descendante. On a établi des corrélations qui décrivent le comportement hydrodynamique et de transfert de matière pour les conditions expérimentales étudiées." @default.
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• W2068753479 date "1999-08-01" @default.
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• W2068753479 title "Influence of geometry and solids concentration on the hydrodynamics and mass transfer of a rectangular airlift reactor for marine sediment and soil bioremediation" @default.
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• W2068753479 doi "https://doi.org/10.1002/cjce.5450770406" @default.
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