WorldCat Identities

Albasi, Claire

Overview
Works: 23 works in 27 publications in 3 languages and 52 library holdings
Genres: Academic theses 
Roles: Thesis advisor, Other, Opponent
Publication Timeline
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Most widely held works by Claire Albasi
L'eau à découvert by Luc Abbadie( )

2 editions published in 2017 in French and held by 26 WorldCat member libraries worldwide

Indispensable à la régulation du climat, au développement de la vie sur Terre, au maintien des écosystèmes, aux populations, au développement de l'agriculture, de l'industrie comme à la production d'énergie, l'eau est un élément vital. Il convient donc, dans un contexte de changement global, d'analyser dans toute sa diversité la place et le rôle de l'eau et de se donner ainsi les moyens de mieux la préserver. Autour de cet enjeu qui engage toute l'humanité, Agathe Euzen, Catherine Jeandel et Rémy Mosseri ont réuni près de cent cinquante contributions, visant à apporter un éclairage sur chacun des domaines et des approches que couvre cette thématique. Quelle est l'origine de l'eau? Son rapport avec l'apparition de la vie? Quel rôle a-t-elle joué dans l'histoire de la planète et dans le développement de la vie végétale, animale et humaine? Quel est son cycle? Quelles sont ses propriétés chimiques? Comment les sociétés se sont-elles emparées de cet élément précieux? Allons-nous manquer d'eau? L'eau est-elle source de conflits? Comment l'eau est-elle gérée? Comment recycle-t-on une eau polluée? Quels sont les risques pour la santé mondiale? Quels sont les grands enjeux liés à l'eau au xxie siècle? Comprendre et proposer des solutions à ces défis majeurs est l'intention de cet ouvrage
Traitement d'effluents polysiloxaniques dans des matrices aqueuses salines : potentiel de la nanofiltration et de l'oxydation biologique by Arthur Boedec( Book )

2 editions published in 2018 in French and held by 2 WorldCat member libraries worldwide

La production industrielle des silicones génère des effluents aqueux contenant des siloxanes et polysiloxanes, chargés en sels à divers stades de la filière. Dans une perspective de développement durable et pour tenir compte des préoccupations grandissantes autour de l'impact environnemental des rejets industriels, des procédés d'épuration sont recherchés. L'objectif de cette étude est d'évaluer les performances de deux procédés, nanofiltration et oxydation biologique, pour le traitement des effluents aqueux polysiloxaniques. Des expériences de nanofiltration frontale ont été réalisées. Les essais préliminaires avec des solutions synthétiques, mélange d'eau et des siloxanes, ont montré une rétention quasi-totale des siloxanes dans tous les cas testés. Des expériences ont ensuite été menées avec des effluents représentatifs des effluents usines de différentes compositions pour évaluer la robustesse du procédé. Nous avons montré que la nanofiltration réduit efficacement la charge organique globale de l'effluent et réduit significativement la concentration en siloxane. La dilution provoque une diminution de l'abattement du COT et de la rétention des siloxanes mais la qualité du perméat est améliorée. L'augmentation de la salinité réduit la qualité du filtrat. Des essais de micro et ultrafiltration des mêmes effluents ont montré que seule la NF permet d'atteindre un niveau de rétention important des siloxanes. Des essais de nanofiltration tangentielle ont ensuite été réalisés afin de préparer une étude plus complète nécessaire en vue d'une éventuelle l'industrialisation du procédé. La biodégradabilité des siloxanes a été explorée par la méthode Oxitop. Aucune activité biologique provoquée par les siloxanes n'a été enregistrée lors de tests Oxitop réalisés avec des boues activées de stations d'épuration, mais aucun effets toxique ou inhibiteur n'ont été observés non plus. Un bioréacteur à membrane pilote a été alimenté pendant 5 mois au laboratoire avec une solution contenant des siloxanes pour tenter d'acclimater les boues activées aux siloxanes. Les tests Oxitop effectués avec des boues issues du pilote n'ont pas mis en évidence d'acclimatation des micro-organismes aux siloxanes
Bioréacteur à membranes immergées pour le traitement d'eaux usées domestiques : influence des conditions biologiques sur les performances du procédé by Maria Elena Hernandez Rojas( Book )

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

The systems with membrane in the wastewaters treatment have several advantages compared with traditional processes at activated sludge. On the other hand one of the principal disadvantages is the fouling of the membrane. Various techniques were used to reduce membrane fouling. In this work the objective is to propose an optimal control of the bioreactor after having to elucidate the relations between the nature of sludge (composition, state of flocculation), the conditions for obtaining it and the fouling of the membrane (specific resistance). The membrane bioreactor was initially fed with a synthetic solution and for three values of sludge age (10, 20 and 30 days. We analyzed the response of the bioreactor compared to the fouling characteristics of produced sludge: quantification of specific resistance and determination of the mechanisms of fouling, analyzes physiological conditions of production of sludge, comparison of these characteristics with the extracellular substances polymeric (SPE) related to sludge and present in the supernatant. In a second part, the pilot was fed by wastewater, at fixed sludge age (20 days) by modifying the volumetric loading rates. The results obtained shown the important role that the compounds of the supernatant play. In the operating conditions considered, no clear relation was presented between of biomass growth rate and the presence of SPE. We shown however how their characteristics determine the amplitude of the fouling caused by sludge as a whole. On the basis of these result, operating conditions supporting a reduced fouling are proposed
Bioréacteur à membranes immergées pour le traitement d'eaux usées domestiques : influence des conditions de filtration et de l'hydrodynamique sur les performances du procédé by Romuald Van Kaam( Book )

2 editions published in 2005 in French and held by 2 WorldCat member libraries worldwide

The aim of this work is the study of a waste water treatment operation using a submerged membrane bioreactor. The study was focused on the influence of operating parameter (filtration time, non filtration time, backflushing, aeration mode and aeration flow rate) in the prevention of membrane fouling. The first part of the study was made with synthetic effluent in order to test several filtration operating conditions in a well known biological environment. The second part consisted in the test of the system with municipal wastewater in order to validate the previous experiments. The main results are that : - Non filtration time can be optimized according to threshold value for membrane permeability and mixed liquor specific resistance. - Aeration has an opposite influence. On one hand, coarse bubbles are useful to prevent membrane fouling but on the other hand aeration can disturb sludge flocculation. Rheological and hydrodynamic analyses points out the viscoplasticity of the mixed liquor, which increases the interest in injecting coarse bubbles in an intermittent way. - Experiments realized with domestic effluent confirm on one hand the operating parameter choice and on the other hand sludge rheological characteristics. - Energetic analysis have pointed out that the operating parameters fixed in this study leads to an economically viable process for domestic wastewater
Decolorization of synthetic melanoidins-containing wastewater by a bacterial consortium by Suhuttaya Jiranuntipon( )

1 edition published in 2008 in English and held by 2 WorldCat member libraries worldwide

Towards tertiary micropollutants removal by bioaugmented moving bed biofilm reactors (MBBRS) and nanofiltration (NF) by Seyed Mehran Abtahi Foroushani( Book )

1 edition published in 2018 in English and held by 1 WorldCat member library worldwide

This thesis aims at answering whether the concept of an integrated layout comprised of a coupled "bioaugmented moving bed biofilm reactors (bMBBRs) - polyelectrolyte multilayer (PEM)-based nanofiltration (NF) membrane" can be considered as a promising technology to eliminate target MPs from conventionally-treated municipal wastewater. Results presented herein indicate that each given component of the layout is efficient in the tertiary removal of MPs. Still, several challenges ahead of the process bioaugmentation (such as the survival and maintenance of inoculated strains) must be in-depth studied to find convenient operating solutions. On the other hand, further investigations are definitely needed to achieve a robust PEM-based membrane as a long-lasting technology. Even though a coupled bMBBR-NF system for enhanced MPs removal can be experimentally justified is, however, practically questionable. "The tale of bMBBR-NF" deserves much more scientific endeavors as plenty of environmental considerations are placed in, whereby achieving a future Green technology will not be far from our expectation
Bioréacteur à membrane externe pour le traitement d'effluents contenant des médicaments anticancéreux : élimination et influence du cyclophosphamide et de ses principaux métabolites sur le procédé by Luis Fernando Delgado Zambrano( )

1 edition published in 2009 in French and held by 1 WorldCat member library worldwide

La problématique concernant la présence et les risques potentiels liés aux micropolluants dans l'environnement est devenue une préoccupation d'actualité. Aujourd'hui, les stations d'épuration ne sont pas en mesure de traiter de manière adéquate ce nouveau type de pollution. Dans le cadre de cette thèse, l'application de la technologie des bioréacteurs à membrane a été envisagée afin d'évaluer leur potentiel pour la dégradation d'un médicament anticancéreux : le cyclophosphamide (CP). Les objectifs de cette étude sont d'une part évaluer le potentiel des bioréacteurs à membrane pour la dégradation du cyclophosphamide, ainsi que pour l'élimination de sa toxicité, d'autre part rechercher l'effet du CP et de ses métabolites sur les performances globales du procédé et sur l'activité de la biomasse épuratrice ainsi que sur les propriétés physico-chimiques de la liqueur mixte et les conséquences sur le colmatage. Deux âges de boues ont été évalués, 50 jours lors de la première campagne et 70 jours lors de la deuxième. L'élimination du CP et du métabolite 4-Keto-CP durant les deux campagnes expérimentales est d'environ 80% pour les deux composés. Les processus d'adsorption et de biodégradation contribuent à l'élimination du CP de l'eau résiduaire traitée. Le cocktail de CP et ces métabolites aux conditions opératoires étudiées n'a pas d'influence significative sur l'élimination globale de la DCO et de l'azote total. Cependant, la toxicité du cocktail des composés pharmaceutiques sur la boue activée modifie les caractéristiques de la matrice biologique : Une diminution de la production de boues du BÀM R1 CP par rapport au BÀM R2 contrôle est observée. La présence du CP et ses principaux métabolites stimule les mécanismes de survie et de production des EPS avec une production légèrement plus forte des polysaccharides que des protéines. Les résultats mettent en évidence que la réponse des boues activées des BÀM au cisaillement est dépendante de la présence de ces molécules. Cette étude démontre au final l'intérêt des BÀM pour traiter ce type d'effluents, et limiter la pollution relarguée dans le milieu naturel
Développement de modèles dynamiques pour la simulation et l'optimisation de bioréacteurs à membranes immergées pour le traitement d'eaux usées by Alain Zarragoitia Gonzalez( )

1 edition published in 2009 in Spanish and held by 1 WorldCat member library worldwide

This thesis studies a submerged membrane bioreactor (MBR) technology that is used to treat effluents. We present in detail the modeling of this process, the validation of developed models, and the results of simulation and optimization carried out with the above mentioned models. The new contributions to scientific knowledge of this work are the following: - A new dynamic model that integrates for such systems, many of the variables and the main phenomena occurring during the process of filtration in MBR wastewater treatment. That constitutes an original contribution to the analysis and development of this technology. - The simulation allows to achieve the quantification of the influence and effect of aeration on the process (membranes fouling) and the influence of the sequencing of the filtration and coarse bubbles aeration cycles. All that takes into account the behavior of biomass, the generation of exopolymeric substances and inlet characteristics. The results provided by the model are validated by comparison with experimental results. - An optimization of MBR operating conditions using the experimental design for simulation, is reported based on the results obtained using the developed models
Bioréacteur à membranes immergées pour le traitement d'eaux usées domestiques influence des conditions biologiques sur les performances du procédé by Maria Elena Hernandez Rojas( )

1 edition published in 2006 in French and held by 1 WorldCat member library worldwide

The systems with membrane in the wastewaters treatment have several advantages compared with traditional processes at activated sludge. On the other hand one of the principal disadvantages is the fouling of the membrane. Various techniques were used to reduce membrane fouling. In this work the objective is to propose an optimal control of the bioreactor after having to elucidate the relations between the nature of sludge (composition, state of flocculation), the conditions for obtaining it and the fouling of the membrane (specific resistance). The membrane bioreactor was initially fed with a synthetic solution and for three values of sludge age (10, 20 and 30 days. We analyzed the response of the bioreactor compared to the fouling characteristics of produced sludge: quantification of specific resistance and determination of the mechanisms of fouling, analyzes physiological conditions of production of sludge, comparison of these characteristics with the extracellular substances polymeric (SPE) related to sludge and present in the supernatant. In a second part, the pilot was fed by wastewater, at fixed sludge age (20 days) by modifying the volumetric loading rates. The results obtained shown the important role that the compounds of the supernatant play. In the operating conditions considered, no clear relation was presented between of biomass growth rate and the presence of SPE. We shown however how their characteristics determine the amplitude of the fouling caused by sludge as a whole. On the basis of these result, operating conditions supporting a reduced fouling are proposed
Microfiltration tangentielle appliquée à l'oenologie : compréhension et maîtrise des phénomènes de colmatage by Youssef El Rayess( )

1 edition published in 2011 in French and held by 1 WorldCat member library worldwide

Wine clarification by membrane processes mainly cross-flow microfiltration has been limited by membrane fouling generating low permeate fluxes with economic efficiency. Understanding, controlling and anticipation of fouling are the main goals of this work. In a first time, the individual contribution of wine compounds (tannins, pectins, mannoproteins and yeasts) to a multichannel ceramic membrane fouling was evaluated. The fouling mechanisms were analyzed using a fundamental approach. The presence of pectins induce the lowest fluxes by a gel-type formation at the membrane surface while yeasts presence tends to reduce fouling in the case of crude wine (case of mixed components). Because it represents the flux beyond which irreversible fouling appears on the membrane surface, the critical flux for irreversibility is a key parameter to control fouling. No critical flux for irreversibility could be measured, hence a criterion that identifies a range of operating conditions where the degree of fouling remains acceptable was proposed. The last part of this work was devoted to the study of dynamic filtration (RVF) for further application in wine sector. This technique was tested with two different membranes: hydrophilic PES and hydrophobic PTFE. Results have allowed to demonstrate the efficiency of the system to reduce fouling in the case of PES membrane. Fouling of PTFE membrane is greatly influenced by molecules / membrane interaction making dynamic filtration ineffective in reducing of membrane fouling
Modélisation et simulation d'un bioréacteur à membranes immergées pour le traitement des eaux usées urbaines et hospitalières by Yusmel González Hernández( )

1 edition published in 2018 in Spanish and held by 1 WorldCat member library worldwide

This thesis presents the modelling of a submerged membrane bioreactor (SMBR) using experimental values coming from SMBR at bench and pilot scale, for the treatment of urban and hospital wastewater respectively. The main objective of this work was to develop a global model integrating a biological model and a model for membrane fouling, with upgraded precision, consistency and calibration in the description of the functioning of these systems. For this, concerning the biological model, an evolution of the Activated Sludge Model 3 (ASM3), including the simultaneous growth and substrate storage, and the bound and soluble extracellular polymeric substances (EPS) production was proposed. The concentration of these EPS joined to those of the total suspended solids (TSS) are the variables transmitted to the new version of the membrane fouling model. This last one can take into account the influence of these substances in the cake porosity. A new procedure was developed to calibrate the parameters taking into account their influence on the model and their uncertainty. This procedure used the data obtained on experimental SMBR and respirometry. It allowed the calibration and successful validation of the developed model. At the same time, a methodology was adapted for the carbon material fractionation according to the ASM models taking into account the phenomenon of substrate storage. Finally, a parametric sensitivity study was conducted, where the global model achieved to respond adequately to the perturbations of the main variables that influence on the membrane fouling process. The high correspondence obtained between numerical and experimental results, as well as the ability of the model to explain most of the cases reported in the literature, evidence the relevance of phenomena considered in the model. Thus, the developed model is justified and the interest of the phenomenological feature of the model is highlighted
Décoloration d'effluents de distillerie par un consortium microbien by Suhuttaya Jiranuntipon( )

1 edition published in 2009 in English and held by 1 WorldCat member library worldwide

Distillery effluent from sugarcane molasses leads to an environmental pollution due to its large volume and the presence of dark brown colored compounds, known as melanoidins. In this study, a bacterial consortium CONS8 isolated from waterfall sediments in Maehongsorn province was selected as a molasses-decolorizing consortium. Consortium CONS8 was able to decolorize, only within 2 days, in Erlenmeyer flasks, three different synthetic wastewaters containing either Viandox sauce (13.5% v/v), beet molasses wastewater (41.5% v/v) or sugarcane molasses wastewater (20% v/v) at 9.5, 8.0 and 17.5%, respectively. Four predominant bacteria present in the consortium CONS8 were identified by the 16S rDNA analysis. To achieve the highest decolorization, the artificial bacterial consortium MMP1 comprising Klebsiella oxytoca, Serratia mercescens (T2) and unknown bacterium DQ817737 (T4), was constructed. Under optimized conditions (aeration, pH), the bacterial consortium MMP1 was able to decolorize the synthetic melanoidins-containing wastewater at 18.3% within 2 days. The comparison of decolorization by the consortium MMP1 with abiotic control proved that the color removal for synthetic melanoidins-containing wastewater medium was mainly due to biotic activity of bacterial cells, without any adsorption phenomena. Supplement of nutrients and vitamin B did not promote melanoidins decolorization by bacterial consortium MMP1. Finally, the performance of a membrane bioreactor (MBR) for synthetic melanoidins-containing wastewater treatment was investigated at laboratory scale, with a mineral membrane. The reactor seeding was made with the MMP1 bacterial consortium inoculum. The reactor was performed with several hydraulic retention times (HRT) of 15, 20, and 40 hours. The performances were analyzed in terms of COD, color removal and biomass in the reactor. The results indicated that the higher COD and color removal efficiency were achieved with the longer HRT
Bioréacteur à membranes immergées pour le traitement d'eaux usées domestiques influence des conditions de filtration et de l'hydrodynamique sur les performances du procédé by Romuald Van Kaam( )

1 edition published in 2005 in French and held by 1 WorldCat member library worldwide

The aim of this work is the study of a waste water treatment operation using a submerged membrane bioreactor. The study was focused on the influence of operating parameter (filtration time, non filtration time, backflushing, aeration mode and aeration flow rate) in the prevention of membrane fouling. The first part of the study was made with synthetic effluent in order to test several filtration operating conditions in a well known biological environment. The second part consisted in the test of the system with municipal wastewater in order to validate the previous experiments. The main results are that : - Non filtration time can be optimized according to threshold value for membrane permeability and mixed liquor specific resistance. - Aeration has an opposite influence. On one hand, coarse bubbles are useful to prevent membrane fouling but on the other hand aeration can disturb sludge flocculation. Rheological and hydrodynamic analyses points out the viscoplasticity of the mixed liquor, which increases the interest in injecting coarse bubbles in an intermittent way. - Experiments realized with domestic effluent confirm on one hand the operating parameter choice and on the other hand sludge rheological characteristics. - Energetic analysis have pointed out that the operating parameters fixed in this study leads to an economically viable process for domestic wastewater
Rôle de la sorption et de la biodégradation dans l'élimination de micropolluants par des procédés d'épuration biologique : application aux molécules anticancéreuses traitées par bioréacteur à membrane by Jordan Seira( )

1 edition published in 2013 in French and held by 1 WorldCat member library worldwide

Les travaux de recherche effectués dans le cadre de ce travail de thèse ont eu pour objectif de caractériser le rôle joué par les mécanismes de sorption et de biodégradation dans l'élimination de micropolluants organiques par les boues biologiques, et notamment celles de bioréacteur à membrane. La première étape a consisté en la mise au point d'une méthode d'analyse de molécules anticancéreuses depuis les phases aqueuse et solide des boues. L'extraction des molécules contenues dans la phase aqueuse a été réalisée par une combinaison de cartouches SPE permettant la récupération sélective d'espèces acides, neutres et basiques. L'extraction depuis la phase solide a été rendue possible grâce à l'utilisation de la technique sous solvant pressurisé et à chaud PLE, suivie par une étape de purification directement inspirée de la méthode développée pour la phase aqueuse. Une procédure originale de préparation d'échantillons de boues a été proposée pour estimer rigoureusement le phénomène de sorption. Le modèle de Freundlich est celui qui a donné les corrélations les plus satisfaisantes et a été sélectionné. La détermination des paramètres du modèle a mis en évidence des comportements de sorption différents pour les molécules ciblées, mais toujours caractérisés par des aptitudes de sorption faibles. La mise en relation des propriétés physico-chimiques des molécules, des boues et des paramètres de sorption n'a pas révélé de corrélations évidentes entre ces différents paramètres et ne permet pas de proposer de modèle capable de prédire la sorption en fonction des caractéristiques des boues et des polluants. La caractérisation du comportement d'un cocktail d'anticancéreux lors du traitement par un pilote de bioréacteur à membrane externe a révélé que le mécanisme majeur à l'origine de leur élimination était la biodégradation. Les interactions entre les microorganismes et les micropolluants ciblés sont liées au cométabolisme. Une étude approfondie du mécanisme a révélé que ces mêmes interactions étaient à l'origine d'une limitation de la biodégradation et doivent être intensifiées pour améliorer les performances de traitement sur ce point
Caractérisation et optimisation des phénomènes de transfert dans un double bioréacteur à membranes by Jan Günther( )

1 edition published in 2009 in French and held by 1 WorldCat member library worldwide

This work presents a specific bioreactor previously designed to study microbial interactions. In this process, the microbial species in two tanks are physically separated by a microfiltration membrane. In order to give to the microorganisms a molecular environment in each compartment similar to the one that would be obtained if the microbial cells were cultivated in the same reactor, two criteria have to be considered: (i) the flow rates between compartments have to be sufficient with respect to the microbial kinetics and (ii) all the molecular compounds of the medium that have an effect on the microorganism behaviour must pass through the membrane. The main constrain is due to transfer of component limited by the fluid flow in and around the fiber of the filtration module. This thesis has therefore committed to deepening the understanding of the mechanisms limiting the transfer involved during the filtration of biological fluid complex according to operating conditions and geometric characteristics of the hollow fiber module of filtration. For this purpose, based on the choice of membrane module configuration proposed in this study, and to strive for a rational optimization of the use of this device, the study relied on the use of CFD tools, supplemented by an experimental approach conducted under models conditions. The numerical simulations of fluid flow have shown a modification of the axial filtration velocity profile with packing density. Similarly, a numerical model of cake deposit was developed and show difference of cake growth along the fiber with packing density. Two experimental hollow fiber modules with two packing densities were tested with clean water and biological fluid, and showed good agreement with the numerical data. These results underline the variations of filtration velocity along the fiber that will allow some predictions on fouling deposit to be done
Potentialité de la biomasse végétale pour le traitement des eaux usées domestiques : développement d'un procédé de biofiltration pour l'assainissement non collectif by Audrey Breton( )

1 edition published in 2013 in French and held by 1 WorldCat member library worldwide

In France, 13 million people are concerned by on-site wastewater treatment (OSWWT). An OSWWT system consists of pretreatment, usually a septic tank, followed by a treatment system. Recent regulatory developments open up a range of possibilities as to possible treatment systems for wastewater treatment. The objective of this thesis is to develop a system of wastewater treatment based on plant biomass from waste of agriculture. Analytical monitoring of six individual houses allowed the study of the characteristics of the wastewater before and after their entry into the pretreatment system. Waters are characterized by a wide variability from one family to another and from the same house. The organic load per person is treating an average of 60 gDBO5.j-1 for a volume of water discharged 90 L.j-1, that to say effluent two times more concentrated than indicated by the regulations. The design and monitoring of a pilot scale laboratory were used to evaluate the potential of several plant biomass for the treatment of pretreated wastewater. They are compared to a reference medium with proven effectiveness in water treatment. The study of treatment performance for two different volume loads of different backgrounds was performed during forty weeks. This study resulted in the development and implementation of a pilot in situ for single house. The approach of life cycle analysis has been applied to in situ pilot in order to optimize the process in place. In addition, LCA has to make a comparison with different existing OSWWT
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1 edition published in 2008 in English and held by 1 WorldCat member library worldwide

Distillery effluent from sugarcane molasses leads to an environmental pollution due to its large volume and the presence of dark brown colored compounds, known as melanoidins. In this study, a bacterial consortium CONS8 isolated from waterfall sediments in Maehongsorn province was selected as a molasses-decolorizing consortium. Consortium CONS8 was able to decolorize, only within 2 days, in Erlenmeyer flasks, three different synthetic wastewaters containing either Viandox sauce (13.5% v/v), beet molasses wastewater (41.5% v/v) or sugarcane molasses wastewater (20% v/v) at 9.5, 8.0 and 17.5%, respectively. Four predominant bacteria present in the consortium CONS8 were identified by the 16S rDNA analysis. To achieve the highest decolorization, the artificial bacterial consortium MMP1 comprising Klebsiella oxytoca, Serratia mercescens (T2) and unknown bacterium DQ817737 (T4), was constructed. Under optimized conditions (aeration, pH), the bacterial consortium MMP1 was able to decolorize the synthetic melanoidins-containing wastewater at 18.3% within 2 days. The comparison of decolorization by the consortium MMP1 with abiotic control proved that the color removal for synthetic melanoidins-containing wastewater medium was mainly due to biotic activity of bacterial cells, without any adsorption phenomena. Supplement of nutrients and vitamin B did not promote melanoidins decolorization by bacterial consortium MMP1. Finally, the performance of a membrane bioreactor (MBR) for synthetic melanoidins-containing wastewater treatment was investigated at laboratory scale, with a mineral membrane. The reactor seeding was made with the MMP1 bacterial consortium inoculum. The reactor was performed with several hydraulic retention times (HRT) of 15, 20, and 40 hours. The performances were analyzed in terms of COD, color removal and biomass in the reactor. The results indicated that the higher COD and color removal efficiency were achieved with the longer HRT
Limitation du colmatage dans les bioréacteurs à membranes à l'échelle industrielle : modélisation et caractérisation de l'hydrodynamique by Elodie Suard( )

1 edition published in 2018 in French and held by 1 WorldCat member library worldwide

Membrane bioreactors (MBRs) are widely used in the wastewater treatment sector. However, membrane fouling mitigation remains challenging, and leads to important maintenance and energy costs. Several strategies have been developed industrially to enhance MBR productivity, including coarse bubble sequenced aeration for fouling mitigation. The way such aeration participates in sludge hydrodynamic patterns is an important research topic. However, the methods currently used for hydrodynamic characterisation suffer from several drawbacks, mainly due to the system's complexity (three phases with opaque deformable solids). More research is needed to characterize hydrodynamics in MBRs filled with activated sludge. A semi-industrial reactor (2.0 m3) was designed and equipped with three hollow fiber membrane modules (KMS Puron) to contribute to fill this knowledge gap. The reactor was continuously fed with activated sludge from one of the reactors of the Seine Aval (SIAAP) wastewater treatment plant. Operating parameters, activated sludge properties as well as process performances were monitored for five months with two objectives: (i) to characterize gas dispersion for different operating conditions (aeration strategy, activated sludge concentrations), (ii) to rank activated sludge properties and operating conditions, according to their impact on fouling mitigation. The ultimate goal is to propose adapted aeration strategies allowing sustainable filtration performance. In order to characterize the gas dispersion in a complex geometry such as MBR membrane tanks, an innovative approach based on electrical resistivity tomography was adapted to the pilot conditions. A numerical approach was used to define the experimental design in terms of electrode positions, quadripole sequences but also inversion parameters, used to reconstruct resistivity maps from experimental datasets. This numerical study, performed on COMSOL, demonstrated the ability of the ERT method to observe different patterns in the membrane zone. ERT was therefore applied to characterise bubble dispersion in the semi-industrial membrane bioreactor filled with activated sludge and operated using different aeration conditions. The dataset obtained from filtration monitoring was analysed using fuzzy logic. The resulting fuzzy decision trees, constructed from the whole dataset or from subsets clustering similar operating conditions, pointed out the impact on the permeability evolution of two main factors: the COD difference between activated sludge supernatant and permeate (COD), standing for complex colloidal phase, and Mixed Liquor Suspended Solid (MLSS) concentration. Both variables emphasizing fouling at high values. Also, an air flow rate augmentation seemed to mitigate fouling, except at high COD concentrations (> 500 mg/L), where its impact was reversed. This last observation needs further investigation, on a larger dataset. The model obtained from fuzzy logic allows a better simulation of permeability evolutions compared to multivariate linear regression (errors of 0.61 and 0.70, respectively), despite a relatively high measurement uncertainty of permeability (up to 16 %). Those results are consistent with the gas dispersion observed with ERT measurements: homogeneity of gas dispersion depends on MLSS concentration and air flow rate. At high concentrations of MLSS (6 g/L and 10 g/L), a high air flow rate is required for the bubbles to be distributed on the whole membrane zone and preferential flow paths have been observed, especially at low air flow rate. This gas dispersion heterogeneity explains worsened filtration performance. In this context, the new use of these technics, ERT and fuzzy logic, provided results that reinforce the interest to link aeration parameters to sludge properties, their MLSS concentration in particular, leading to consider control strategies for these operating parameters
Développement d'un procédé de lissage de charge par adsorption/désorption en amont d'une épuration biologique pour le traitement d'eaux résiduaires industrielles. by Séda Bourneuf( )

1 edition published in 2015 in French and held by 1 WorldCat member library worldwide

Les sites chimiques, pétrochimiques et pétroliers génèrent des effluents chargés en polluants soumis à une réglementation de plus en plus stricte. Le travail de thèse se focalise sur le traitement des effluents industriels et plus spécifiquement sur l'amortissement des pics de pollution via un procédé d'adsorption/désorption afin de minimiser les impacts négatifs sur l'épuration biologique. Pour cela, deux études complémentaires ont été menées en parallèle. La première étude concerne l'adsorption et la désorption de polluants en phase aqueuse avec notamment la sélection d'un adsorbant puis la détermination de ses capacités d'adsorption vis-à-vis de deux molécules modèles. Plusieurs cycles d'adsorption et de désorption ainsi que des pics de pollution ont été réalisés afin de (i) démontrer la faisabilité du procédé, (ii) d'identifier les phénomènes mis en jeu et les paramètres déterminants dans la capacité d'amortissement d'une colonne d'adsorbant et (iii) étudier les phénomènes de compétition entre molécules. Les données expérimentales ont pu être modélisées avec succès à l'aide d'un couplage du modèle Linear Driving Force (LDF) et de l'isotherme de Freundlich. D'autre part, l'impact d'une variation de charge sur les performances épuratoires du traitement biologique seul a été examiné et comparé aux effets observés lors d'un pic de pollution sur un procédé couplant une colonne d'adsorbant (en amont) et le traitement biologique. Un intérêt a également été porté aux foisonnements de bactéries filamenteuses, survenus à plusieurs reprises : une identification des filaments a été réalisée et un traitement de lutte efficace a été mis en place. Les résultats ont démontré qu'une colonne d'adsorbant placée en amont du bassin de biodégradation permet d'améliorer la qualité de l'effluent traité et ainsi de respecter les normes de rejet fixées par la législation
Aération pour le décolmatage dans les bioréacteurs à membranes immergées pour le traitement des eaux usées : impact sur le milieu biologique et la filtration by Etienne Braak( )

1 edition published in 2012 in French and held by 1 WorldCat member library worldwide

This work contributes to the knowledge on aeration for fouling prevention in submerged membrane bioreactors, which represents a great part of energy consumption of the process. More precisely it aims at estimating the impact of aeration on mixed liquor properties for operational parameters range close to those used in full scale plants. Our study links operational parameters (airflow rate), hydrodynamics at macroscopic scale (bubble sizeand velocity), hydrodynamics at local scale (shear stresses), biological media properties (floc size and soluble extracellular polymeric substances), and filtration performance (transmembrane pressure variations). Hydrodynamics characterisation of two phase flow in membrane module enabled to highlight differences between air/water and air/sludge hydrodynamics with 15-25 % lower bubble velocities in sludge but one order of magnitude higher shear stress (maximal values of 10 Pa). Controlled breakdown of biological media was performed by imposing constant shear stress (range 0,1-10 Pa) to mixed liquor samples. Increase of shear induced a decrease of floc size, and soluble extracellular polymeric substances release. The comparison with shear value obtained by simulation showed that stresses induced by aeration were in the range of mixed liquor destructuration. A pilot campaign showed that wastewater had a stronger impact on the long term on mixed liquor properties, and thus filtration performances, than aeration. However higher transmembrane pressure increase rate observed on pilot for higher airflow at similar wastewater quality could be explained by stronger breakage of biological agregates on short term
 
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