WorldCat Identities

Ducom, Gaëlle (1975-....).

Overview
Works: 4 works in 6 publications in 1 language and 6 library holdings
Roles: Thesis advisor, Author, Opponent
Publication Timeline
.
Most widely held works by Gaëlle Ducom
Etude de procédés hybrides pour la nanofiltration de macroémulsions : couplage avec une déstabilisation chimique et avec un écoulement gaz / liquide by Gaëlle Ducom( Book )

2 editions published in 2001 in French and held by 2 WorldCat member libraries worldwide

This study concerns the nanofiltration process applied to cutting oil fluids in the form of macroemulsions treatment. The aim is to enhance this process productivity, which is essentially limited by fouling in the form of oil drops deposit and by polarisation concentration. Both phenomena induce low permeate fluxes. For that, two processes were studied: use of air sparging and coupling with a chemical destabilisation of the emulsion. The first process allows flux enhancement for several kinds of solutions: stabilised or non-stabilised emulsions and clay suspensions. The permeate flux enhancement can reach a factor 2.4 depending on the operating conditions. Two-phase flow in the concentrate compartment of a flat sheet cell was characterised. A data bank of flow characteristics was obtained and wall shear stresses at the membrane surface were determined using an electrochemical method. Flux enhancement in nanofiltration was then linked to some hydrodynamic parameters. On the other hand, in the operating conditions of this study, the second process does not induce flux enhancement, which was partly explained by osmotic phenomena. Several destabilisation mechanisms of the emulsion were identified, depending on the salt concentration
Influence des procédés de la filière traitement thermique sur les caractéristiques et les évolutions bio-physico-chimiques des Mâchefers d'Incinération d'Ordures Ménagères (MIOM) = nfluence of waste input and process technology on Municipal Solid Waste Incinerator : Bottom ash bio-physico-chemical characteristics and behaviors by Eva Rendek( Book )

2 editions published in 2006 in French and held by 2 WorldCat member libraries worldwide

The waste input and the process technology of the plant appear to have a great influence on bottom ash quality. To better understand how these parameters can affect the residues characteristics, bottom ash from 6 different plants were tested and compared in this study. Bottom ash physico-chemical characteristics were investigated by chemical analyses, and leaching tests. In order to understand their long-term behavior, accelerated ageing experiments and biodegradation tests were also performed. The whole analyses gave complementary information. It was shown that the 6 samples do have different properties. Waste input have a great influence on Cl and S content in bottom ash, as well as on the Ca/Si ratio. The importance of this ratio on carbonation process has been demonstrated. Combustion parameters have an influence on quantity and mobility of the residual organic matter. Biological and physicochemical experiments were coupled with a view to developing a new rapid assessment method of bottom ash quality. Comparative results of leaching tests and biodegradation experiments showed a positive correlation between dissolved carbon and microbial activity. However, quantities of biodegraded or leached carbon are not representative of the samples total organic carbon content. Thermal analysis have revealed the presence of two fractions of organic components, showing different thermal behaviors. One of them can be directly linked to the leachable and biodegradable organic matter fraction. Calorimetric test is then a novel analysis method that allows to provide rapid and global information concerning the characteristics of organic matter in bottom ash and its possible short and long-term evolution
Epuration fine des biogaz en vue d'une valorisation énergétique en pile à combustible de type SOFC : Adsorption de l'octaméthylcyclotétrasiloxane et du sulfure d'hydrogène by Léa Sigot( )

1 edition published in 2014 in French and held by 1 WorldCat member library worldwide

Biogas energy use is hampered by the presence of trace compounds. Three contaminant families are particularly detrimental for external reforming catalysts and solid oxide fuel cell (SOFC) anodes: sulfur-containing compounds, volatile organic silicon compounds (VOSiC) and chlorinated compounds. Therefore, a thorough biogas treatment is necessary for such an application. This experimental work deals with the development of a polishing treatment for the adsorption of these contaminants. Adsorbents were selected for their efficiency to remove hydrogen sulfide (H2S - sulfur-containing compound), octamethylcyclotetrasiloxane (D4 - VOSiC) and cis-1,2-dichloroéthene (C2H2Cl2 - chlorinated compound), molecules representative of the three harmful families. The studied zeolite showed the best efficiency for H2S removal whereas silica gel performed best for D4 adsorption. A parametric study highlighted the influence of adsorbent bed height, contaminant concentration, gas flow rate, the presence of contaminants in mixture and humidity on purification performance. Adsorption tests with a raw landfill biogas showed that it is possible to guarantee an H2S concentration below the 1 ppmvH2S tolerance limit of the reformer. Using adsorbent physicochemical characterizations, hypothesis about retention mechanisms were proposed for the couples zeolite + H2S and silica gel + D4. H2S is adsorbed and then oxidized into elemental sulfur at the surface of the zeolite. During the adsorption on silica gel, D4 seems to polymerize on the surface. These two phenomena prevent the regeneration of the adsorbents. A first modeling approach of the adsorption phenomena involved for the couple silica gel + D4 allowed the determination of the global mass transfer coefficient. Experimental breakthrough curves obtained for different masses of adsorbent were successfully simulated. Some “dimensioning rules” were proposed for the industrial design of a polishing treatment able to produce a biogas with the quality required to feed an SOFC. The techno-economic analysis showed that the SOFC solution is technically feasible but not economically viable because SOFC technology is still too costly compared to conventional conversion devices. However, the solution seems promising from an environmental point of view
Influence des procédés de la filière traitement thermique sur les caractéristiques et les évolutions bio-physico-chimiques des Mâchefers d'Incinération d'Ordures Ménagères (MIOM) nfluence of waste input and process technology on Municipal Solid Waste Incinerator Bottom ash bio-physico-chemical characteristics and behaviors by Eva Rendek( )

1 edition published in 2007 in French and held by 1 WorldCat member library worldwide

L'évolution réglementaire en matière de gestion des déchets incite à la valorisation des Mâchefers d'Incinérations d'Ordures Ménagères (MIOM), notamment à leur réutilisation en matière routière. Or les caractéristiques physiques et techniques de ces sous produits sont en pleine évolution. Ces modifications constitutives résultent de l'évolution de plusieurs facteurs techniques et socio-économiques de la filière (nature des déchets incinérés, conditions d'incinération, conditions de stockage, prétraitement,...). Afin de comprendr les paramètres influant sur la composition et le comportement à long terme des mâchefers, 6 lots de MIOM ont été sélectionnés avec notre partenaire industriel NOVERGIE SUEZ et comparés. La synthèse de ce travail consiste en la corrélation des résultats de la phase expérimentale et des données relatives aux caractéristiques des filières. Un lien a été clairement établi entre la nature des déchets incinérés et la composition des mâchefers. La fraction massique de verre prélevée par une collecte sélective efficace a un impact direct sur les teneurs relatives en calcium et silicium dans les MIOM et sur la conduite des fours (modification du PCI). Le rapport Ca/Si a des conséquences sur le potentiel de carbonatation des MIOM et, de ce fait, sur leur stabilisation vis à vis du relargage de certains métaux lourds qui conditionne leur valorisation. En dehors de la lixiviation des métaux lourds, le second paramètre qui peut limiter la valorisation des MIOM est le taux de matière organique résiduelle lixiviable. Sur ce point, des corrélations (à l'échelle du laboratoire) entre matière organique biodégradable et lixiviable ont été mises en évidence. Il n'y a pas de lien évident entre l'efficacité de la collecte des fractions organiques (plastiques, papiers-cartons, fermentescibles) et le taux d'imbrûlés dans les MIOM. Ce dernier paraît essentiellement dépendant des technologies de combustion et de la conduite des fours. La méthode microcalorimétrique mise en cours de ce travail a permis de différencier les 6 MIOM étudiés en affinant certaines caractéristiques des molécules organiques imbrûlées. Il existe deux types de molécules dont les paramètres de combustion (température et enthalpie) sont sensiblement différents. Une de ces deux fractions est constituée, pour partie, de molécules solubles. La méthode développée paraît siffisamment fiable, en terme de répétitivité, pour que l'on puisse l'envisager comme appui aux gestionnaires d'incinérateur pour le suivi de la conduite des fours
 
Audience Level
0
Audience Level
1
  General Special  
Audience level: 0.92 (from 0.90 for Epuration ... to 0.94 for Etude de p ...)

Alternative Names
Gaëlle Ducom wetenschapper

Languages
French (6)