References of "Vasel, Jean-Luc"
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See detailMODELLING OF BACTERIAL SULPHATE REDUCTION IN ANAEROBIC PONDS : KINETIC INVESTIGATIONS
Harerimana, Casimir ULg; Vasel, Jean-Luc ULg; Jupsin, Hugues ULg et al

in Australian Water Association (2011)

The aim of the study was first to develop a simple and practical model of anaerobic digestion including sulphate-reduction in anaerobic ponds. The basic microbiology of our model consists of three steps ... [more ▼]

The aim of the study was first to develop a simple and practical model of anaerobic digestion including sulphate-reduction in anaerobic ponds. The basic microbiology of our model consists of three steps, namely, acidogenesis, methanogenesis, and sulphate reduction. This model includes multiple reaction stoichiometry and substrate utilization kinetics. The second aim was to determine some kinetic parameters associated with this model. The values of these parameters for sulfidogenic bacteria are used in the anaerobic pond model to describe the sulphate reduction processes and to evaluate the risk of odour generation. [less ▲]

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See detailSome influences of sediments in aerated lagoons and waste stabilization ponds
Chabir, D.; El Ouarghi, H.; Brostaux, Yves ULg et al

in Water Science & Technology (2000), 42(10), 237-246

Respirometric tests have been undertaken on sediments in aerated lagoons and waste stabilization ponds to quantify their oxygen demand and to determine the main factors governing the process. Factors such ... [more ▼]

Respirometric tests have been undertaken on sediments in aerated lagoons and waste stabilization ponds to quantify their oxygen demand and to determine the main factors governing the process. Factors such as seasonal variations, temperature, substrate, sediment layer thickness, density of macro-invertebrates and suspended sediments were investigated. The results showed that temperature and substrate concentration are the main factors that influence sediment oxygen demand; followed by spatial heterogeneity and resuspension of sediments, whereas the density of macro-invertebrates could have an effect in summer (hot season). Sediment layer thickness had no effect. A model of sediment oxygen demand is developed for the two main factors (temperature and substrate) with an r2 of 0.98. [less ▲]

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See detailL'environnement
Andre, Philippe ULg; Boreux, Jean-Jacques ULg; Hanson, Alain ULg et al

in Nguyen, Long-Den; Tsalkovitch, Gérard (Eds.) La mesure et l'instrumentation. Etat de l'art et perspectives. (1995)

Il s'agit du chapitre 14 d'un ouvrage collectif consacré à la mesure et à l'instrumentation. Ce chapitre présente plusieurs aspects de la démarche de la mesure dans l'environnement. Il explicite les ... [more ▼]

Il s'agit du chapitre 14 d'un ouvrage collectif consacré à la mesure et à l'instrumentation. Ce chapitre présente plusieurs aspects de la démarche de la mesure dans l'environnement. Il explicite les aspects méthodologiques propres à l'environnement et les méthodes de mesure qui en découlent, notamment les bio-capteurs, les bio-indicateurs, l'utilisation de l'homme comme instrument de mesure, … Il balaye les différents secteurs de l'environnement -air, eau, odeur- et montre comment le modèle et la théorie de l'analyse des systèmes peuvent être considérés comme des outils performants de surveillance d'atmosphères polluées ou de confort thermique dans les bâtiments. [less ▲]

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See detailBase de calcul pour le dimensionnement d'une tour de refroidissement à tirage naturel
Nicolas, Jacques ULg; Vasel, Jean-Luc ULg

in European Journal of Mechanical and Environmental Engineering (1992), 37

Le but de cet article est de fournir de façon exhaustive l'ensemble des relations qui permettent le calcul des transferts thermiques dans une tour de refroidissemenmt à contrecourant et à tirage naturel ... [more ▼]

Le but de cet article est de fournir de façon exhaustive l'ensemble des relations qui permettent le calcul des transferts thermiques dans une tour de refroidissemenmt à contrecourant et à tirage naturel. L'article se base sur les approches classiques décrites dans la littérature (Merkel, Chilton, Braun, ...), mais en uniformisant les symboles et les unités, de façon à fournir en un seul texte tous les éléments qui permettent de modéliser, pour des besoins de contrôle ou de dimensionnement, une tour de refroidissement et d'en estimer les performances.Quelques pratiques d'utilisation de ces relations sont étudiées, ainsi qu'une confrontation de différentes méthodes de résolution sur un même exemple. [less ▲]

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See detailModélisation des échanges thermiques et de la circulation d'air dans un lit bactérien
Nicolas, Jacques ULg; Vasel, Jean-Luc ULg

in Revue des Sciences de l'Eau = Journal of Water Science (1990), 3(3), 303-324

The temperature is one of the main parameters governing the biological reactions in a trickling filter. The present model proposes a set of equations applicable for the determination of a temperature ... [more ▼]

The temperature is one of the main parameters governing the biological reactions in a trickling filter. The present model proposes a set of equations applicable for the determination of a temperature profile, and therefore of an average temperature, inside the trickling filter, when the flowrate and the temperature at entry of the liquid, the ambient air conditions (temperature and humidity) and the thermal exchange coefficients of the tower are known. Moreover, the airflow induced by natural draft is also computed when the head loss coefficients in the media and at entry are known. Beside this formulation, the first results of modal fitting on pilot plants are discussed. With few further developments, the method could be useful for the optimization of the operating temperature in a trickling filter which guarantees a sufficient airflow rate in the tower. [less ▲]

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