Clayey-sand filter for the removal of pharmaceuticals from wastewater effluent: Percolation experiments

Autor: Mohammed Boussafir, L. Le Forestier, Thomas Thiebault, Régis Guégan, C. Le Milbeau
Přispěvatelé: Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO), Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Biogéosystèmes Continentaux - UMR7327, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC), HArPE Project (2012-00073536) funded by the Région Centre-Val de Loire
Jazyk: angličtina
Rok vydání: 2016
Předmět:
Zdroj: Environmental Science : Water Research and Technology
Environmental Science : Water Research and Technology, Royal Society of Chemistry, 2016, 2, pp.529-538. ⟨10.1039/C6EW00034G⟩
ISSN: 2053-1400
2053-1419
DOI: 10.1039/C6EW00034G⟩
Popis: International audience; The objective of the study was to evaluate the sorption of a pool of pharmaceutically active compounds (PhACs) onto a clay-sand filter in a dynamic sorption experiment. The chosen adsorbent should have suitable chemical properties for the removal of the targeted PhACs and also consistent hydrodynamic behavior regarding field application. In this aim, the impact of interfoliar cation (Ca 2+ or Na +) intercalated into natural montmorillonite (Swy2) was tested by using different clay-sand ratios (from 0% to 100% of clay minerals). Only Ca-Swy2 showed a consistent hydraulic conductivity for field application with a value of 4.78 x 10-8 m.s-1 for 5%-95% clay-sand ratio. The sorption of PhACs onto this filter was investigated using oedometer cells by varying two parameters, the solution matrix (ultra-pure water or natural effluent) and the injection pressure (0.1 MPa and 0.2 MPa). PhACs were effectively adsorbed onto the filter for each experiment at different levels. The drop in injection pressure was a favorable factor for sorption whatever the matrix, with median global removal of ~45% at 0.2 MPa and ~75% at 0.1 Mpa. The effect of the matrix exhibited two different trends as a function of the molecular charge of each PhAC. While cationic compounds were more effectively sorbed in the ultra-pure water matrix than in effluent matrix the sorption of anionic PhACs was more effective in the effluent matrix than in ultra-pure water. This indicates that the charge of the pollutant is a key parameter controlling the efficiency of the adsorbent. Despite these removal variations, the filter exhibited a significant sorption capacity especially at 0.1 MPa. It can therefore be an efficient solution for the removal of PhACs by tertiary filtration.
Databáze: OpenAIRE
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