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EnglishOsmosis is known to play a key role in reducing the transport rate of contaminants through the natural and engineered clay barriers that are used for a number of geoenvironmental applications, such as the lining of landfills and the deep geological disposal of radioactive wastes. Although a significant body of experimental research has focused on the quantification of osmotic phenomena in smectite clays permeated with single-electrolyte solutions, no evidence has been provided about the membrane behaviour of clays in solute mixtures and, specifically, about the so-called osmotic anomalies (i.e. membrane efficiency coefficient outside the 0 to 1 range) that have been documented in the biological and chemical literature for fine-porous charged diaphragms in the presence of two or more electrolytes. In view of the similarities between such fine-porous media and smectite clays, the aim of the paper is to discuss the conditions under which bentonite-based barriers are expected to exhibit the aforementioned osmotic anomalies, which are shown to be caused by the different diffusivities and electrochemical valences of the migrating cations.
Relevance of Chemico-Osmotic and Electro-Osmotic Phenomena in Bentonite-Based Barriers / Guarena, N.; Dominijanni, A.; Manassero, M.. - STAMPA. - 126(2021), pp. 903-910. ((Intervento presentato al convegno 16th International Conference of the International Association for Computer Methods and Advances in Geomechanics, IACMAG 2021 tenutosi a ita nel 2021 [10.1007/978-3-030-64518-2_107].
| Titolo: | Relevance of Chemico-Osmotic and Electro-Osmotic Phenomena in Bentonite-Based Barriers | |
| Autori: | ||
| Data di pubblicazione: | 2021 | |
| Serie: | ||
| Abstract: | Osmosis is known to play a key role in reducing the transport rate of contaminants through the na...tural and engineered clay barriers that are used for a number of geoenvironmental applications, such as the lining of landfills and the deep geological disposal of radioactive wastes. Although a significant body of experimental research has focused on the quantification of osmotic phenomena in smectite clays permeated with single-electrolyte solutions, no evidence has been provided about the membrane behaviour of clays in solute mixtures and, specifically, about the so-called osmotic anomalies (i.e. membrane efficiency coefficient outside the 0 to 1 range) that have been documented in the biological and chemical literature for fine-porous charged diaphragms in the presence of two or more electrolytes. In view of the similarities between such fine-porous media and smectite clays, the aim of the paper is to discuss the conditions under which bentonite-based barriers are expected to exhibit the aforementioned osmotic anomalies, which are shown to be caused by the different diffusivities and electrochemical valences of the migrating cations. | |
| ISBN: | 978-3-030-64517-5 978-3-030-64518-2 | |
| Appare nelle tipologie: | 4.1 Contributo in Atti di convegno |
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| File | Descrizione | Tipologia | Licenza | |
|---|---|---|---|---|
| Guarena_et_al_2021.pdf | Articolo pubblicato | 2a Post-print versione editoriale / Version of Record | Non Pubblico - Accesso privato/ristretto | Administrator Richiedi una copia |
| PS16_iacmag.pdf | Manoscritto accettato per la pubblicazione | 2. Post-print / Author's Accepted Manuscript | PUBBLICO - Tutti i diritti riservati | Visibile a tuttiVisualizza/Apri |
http://hdl.handle.net/11583/2947792
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