Association of Uranium with Organic Matter- and Iron-bearing Colloids in Wetland Environments

Informations projet

UMIC

N° de convention de subvention: 701542

DOI 10.3030/701542

Projet clôturé

Date de signature de la CE 17 Mars 2016

Date de début 1 Octobre 2016

Date de fin 30 Janvier 2019

Financé au titre de

• EXCELLENT SCIENCE - Marie Skłodowska-Curie Actions

Coût total € 175 419,60

Contribution de l’UE € 175 419,60

Coordonné par

ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE
Suisse

Objectif

In the context of decreasing water standards for uranium (U) concentrations in drinking water, the use of natural or constructed wetlands is often proposed for cost-effective small-scale water treatment. The underlying mechanism is immobilization of the dissolved form of uranium, U(VI), through its reduction to a less mobile form, U(IV). However, the long-term stability of U(IV) species formed is not well understood. Indeed, a significant amount of U is found labile, even in its reduced form, and contaminates the hydrologic network in several sites. Previous studies suggest that the colloidal phase is responsible for the dispersion of U(IV) in the watershed. In addition, it has been hypothesized that the propensity of the colloidal phase to bind and mobilize U(IV) depends on the association of Fe with colloidal natural organic matter (NOM), and on the colloids conformation. However, these hypotheses need to be investigated and information is lacking on the processes leading to the formation of the pressented vector of U(IV) dissemination, i.e. Fe-NOM colloids. Understanding these processes is crucial for predicting the efficiency of wetlands as traps of U water contamination. We propose to (i) further characterize wetland colloids, in a broader panel of wetlands, and use correlation analysis to pinpoint factors controlling the NOM shape and its ability for Fe- and U-binding; (ii) test in batch experiments the effect of Fe sources on NOM properties in solution; and (iii) test the reactivity of Fe-NOM colloids with U(IV) and identify the U(IV) binding mechanisms at molecular levels. The original approach proposed will help decision making for uses of wetland filters, and also generate fundamental knowledge about NOM reactivity. The project involves the state-of-the-art expertise of the host institute (EPFL) about U geochemistry in wetlands, and the complementary expertise of Geneva University about characterization of colloidal organic matter.

Champ scientifique (EuroSciVoc)

CORDIS classe les projets avec EuroSciVoc, une taxonomie multilingue des domaines scientifiques, grâce à un processus semi-automatique basé sur des techniques TLN. Voir: https://op.europa.eu/en/web/eu-vocabularies/euroscivoc.

• sciences naturelles › sciences de la Terre et sciences connexes de l'environnement › sciences de l'environnement
• sciences naturelles › sciences physiques › physique de la matière condensée › physique de la matière molle
• sciences naturelles › sciences physiques › optique › microscopie › electron microscopy
• sciences naturelles › sciences de la Terre et sciences connexes de l'environnement › hydrologie › bassin hydrologique
• sciences naturelles › sciences de la Terre et sciences connexes de l'environnement › sciences de l'atmosphère › climatologie › changement climatique

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Programme(s)

• H2020-EU.1.3. - EXCELLENT SCIENCE - Marie Skłodowska-Curie Actions Main Programme
• H2020-EU.1.3.2. - Nurturing excellence by means of cross-border and cross-sector mobility

Thème(s)

• MSCA-IF-2015-EF - Marie Skłodowska-Curie Individual Fellowships (IF-EF)

Appel à propositions

H2020-MSCA-IF-2015

Régime de financement

MSCA-IF-EF-ST -

Coordinateur

ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE

• Contribution nette de l'UE: € 175 419,60
• Adresse: BATIMENT CE 3316 STATION 1 ; 1015 Lausanne ; Suisse
• Région: Schweiz/Suisse/Svizzera › Région lémanique › Vaud
• Type d’activité: Établissements d’enseignement supérieur ou secondaire
• Coût total: € 175 419,60