Removal of arsenate from drinking water with a natural manganese oxide in the presence of competing anions - INRA - Institut national de la recherche agronomique Accéder directement au contenu
Article Dans Une Revue Water Science and Technology: Water Supply Année : 2001

Removal of arsenate from drinking water with a natural manganese oxide in the presence of competing anions

Résumé

The efficiency of arsenic removal from drinking water in adsorption processes using natural oxides may be influenced by the presence of other adsorbable anions. The present paper focuses on the study of arsenate adsorption by a natural manganese oxide. The objective is to determine which of the anions usually present in drinking water may be adsorbed: hydrogen carbonate, sulfate, chloride, nitrate, phosphate and arsenate. A kinetic batch experiment was conducted with a natural drinking water, leading to a first qualitative selection: nitrate and chloride have little interaction with the adsorbent, sulfate and hydrogen carbonate are adsorbed while phosphate and arsenate are strongly adsorbed. Then column experiments were run with aqueous solutions containing either chloride, sulfate, etc. The previous trends were confirmed and the equilibrium isotherms of the adsorbable anions were built by integration of the breakthrough curves. The isotherms fitted with a Langmuir model showed that the capacities were low (a few µmol.g-1). The affinity order was determined from the isotherm initial slopes: arsenate >> phosphate > hydrogen carbonate ≅ sulfate. Given the strong affinity of the adsorbent for arsenate and the low arsenate concentration in drinking water, the process selectivity for As traces from drinking water is ensured.
Fichier principal
Vignette du fichier
WS&Touvrard.pdf (180.38 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-02445986 , version 1 (27-01-2020)

Identifiants

Citer

Stéphanie Ouvrard, M.-O. Simonnot, M. Sardin. Removal of arsenate from drinking water with a natural manganese oxide in the presence of competing anions. Water Science and Technology: Water Supply, 2001, 1 (2), pp.167-173. ⟨10.2166/ws.2001.0034⟩. ⟨hal-02445986⟩
32 Consultations
76 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More