Pegase modelling studies applied to micropollutants: use cases

For the last years, PEGASE model has been used in two studies aiming at better assessment of the source and behaviour of micropollutants in the rivers network. In the first study, with financial support from INERIS1, the PEGASE model has been used to simulate the fate of micropollutants (Cd, Zn & Cu) within the basins of the Meuse and the Adour. The choice of the modelled micropollutants and sub-basins has been performed in agreement with INERIS, the involved Water Agencies and the Aquapole. A major selection criterion was the availability of data (discharges and in-situ measurements). For the second study, the PEGASE model has been adapted to describe the cocaine fate (or rather one of its stable metabolite: benzoylecgonine–BZE) in surface water. The BZE has been added to the model as an additional micropollutant, thanks to the implementation of a new state variable. Simulations of BZE have been done in Belgium, where many measurements from the COWAT project [3] were available. The first results show a good matching between calculated and measured values. The ability of the model to simulate the fate of micropollutants (including emerging substances) within surface water has been demonstrated, but still requires enhancements and extension to other substances and sub-basins. In addition, these studies have shown the huge work remaining in discharge inventories

TRANSNATIONAL MODELING OF THE SURFACE WATER QUALITY OF THE INTERNATIONAL RIVER BASIN DISTRICT MEUSE WITH PEGASE

The PEGASE Model has been applied at the entire International River Basin District of the Meuse. The poster presents different sub-basin applications on (i) the Chiers (Luxembourg + Belgium Walloon Region and French Rhin-Meuse Basin, 2000-2006) for the reference years 2000 and 2002 and prospective scenario 2015, (ii) International simulation performed (during 2005-2006) upstream (up to the Belgian border) for the reference year 2002, (iii) Current coordination between BE-Flemish Region and NL for downstream simulations of historical situation and (iv) prospective scenarios : International databases for a single reference year on the whole Meuse Distric

Le logiciel PegOpera : un outil pour la gestion intégrée des eaux de surface

Le logiciel PegOpera inclut la version 5 du modèle Pegase (Planification Et Gestion de l’ASsainissement des Eaux) et une nouvelle interface graphique. PegOpera est un outil personnalisé utilisé par les gestionnaires de l’eau et opérationnel dans les champs d’applications de la Gestion Intégrée des Ressources en Eau (assainissement, DCE, NQE, …)

Pegase, a model dedicated to Surface WAter Quality Assessment that helps stakeholders implementing the WFD

Pegase, a model dedicated to surface water quality assessment that helps stakeholders implementing the WFD. That presentation showed 2 different applications directly made by the stakeholders in charge of the water management at the basin scale. The end-users analysed results of the Pegase model in the scope of implementation of the WFD. Differents scenarios were build in order to simulate the way to reach the good status for water bodies. Associated costs were estimated and relevant decisions were oriented using the results of the numerical Pegase tool

Percolation transition in the porous structure of latex-templated silica monoliths

International audiencePorous sol-gel silica monoliths are prepared using PMMA nanoparticles, 60 nm in diameter, as sacrificial templates. The pore-structure of the calcined pellets is investigated through nitrogen adsorption to assess the evolution of the porosity when varying the amount of porogen. The latex templated monoliths present a well defined spherical extrinsic porosity and an intrinsic microporosity due to preparation process. As a result of a careful analysis of the adsorption hysteresis, we identify a percolation threshold of the spherical porosity around 30% volume fraction. This phenomenon, similar to the percolation previously observed in latex-templated silica films, opens the way to the use of latex-templated porous silica monoliths with a tailorable and reliable pore structure

Water Framework Directive and Modelling Using PEGOPERA Simulation Software

peer reviewedaudience: researcher, professional, studentThe Water Framework Directive 2000/60/EC (WFD) established a framework for community action in the field of water policy. To implement the WFD, the competent authorities for watershed management should use modelling techniques to establish, for example, the pressure/impacts relationship. The PEGOPERA modelling tool (composed of the water quality model PEGASE and a friendly Graphical User Interface), has been developed in order to be compliant with the requirements of the WFD. PEGASE is a physicochemical model describing the behaviour of whole river systems, at various scales, from tens to tens of thousands km². The specificity of the model is its ability to work at a high spatial resolution not only for small river basins (water body level), but also for large drainage networks. Already used by several basin management competent authorities, the PEGOPERA modelling tool proved to be an efficient tool for helping in surface water management from local up to the international district level and is therefore an operational numerical tool for WFD implementatio

The extreme UV imager telescope on-board the Solar Orbiter mission: overview of phase C and D

The Solar Orbiter mission is composed of ten scientific instruments dedicated to the observation of the Sun’s atmosphere and its heliosphere, taking advantage of an out-of ecliptic orbit and at perihelion reaching a proximity close to 0.28 A.U. On board Solar Orbiter, the Extreme Ultraviolet Imager (EUI) will provide full-Sun image sequences of the solar corona in the extreme ultraviolet (17.1 nm and 30.4 nm), and high-resolution image sequences of the solar disk in the extreme ultraviolet (17.1 nm) and in the vacuum ultraviolet (121.6 nm). The EUI concept uses heritage from previous similar extreme ultraviolet instrument. Additional constraints from the specific orbit (thermal and radiation environment, limited telemetry download) however required dedicated technologies to achieve the scientific objectives of the mission. The development phase C of the instrument and its sub-systems has been successfully completed, including thermo-mechanical and electrical design validations with the Structural Thermal Model (STM) and the Engineering Model (EM). The instrument STM and EM units have been integrated on the respective spacecraft models and will undergo the system level tests. In parallel, the Phase D has been started with the sub-system qualifications and the flight parts manufacturing. The next steps of the EUI development will be the instrument Qualification Model (QM) integration and qualification tests. The Flight Model (FM) instrument activities will then follow with the acceptance tests and calibration campaigns

Influence of Temperature on the Performance of Carbon- and ATO-supported Oxygen Evolution Reaction Catalysts in a Gas Diffusion Electrode Setup.

State-of-the-art industrial electrocatalysts for the oxygen evolution reaction (OER) under acidic conditions are Ir-based. Considering the scarce supply of Ir, it is imperative to use the precious metal as efficiently as possible. In this work, we immobilized ultrasmall Ir and Ir0.4Ru0.6 nanoparticles on two different supports to maximize their dispersion. One high-surface-area carbon support serves as a reference but has limited technological relevance due to its lack of stability. The other support, antimony-doped tin oxide (ATO), has been proposed in the literature as a possible better support for OER catalysts. Temperature-dependent measurements performed in a recently developed gas diffusion electrode (GDE) setup reveal that surprisingly the catalysts immobilized on commercial ATO performed worse than their carbon-immobilized counterparts. The measurements suggest that the ATO support deteriorates particularly fast at elevated temperatures