Pilot-scale application of attapulgitic clay for stabilization of toxic elements in contaminated soil / V. Zotiadis in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 5 (Mai 2012)  

Public ISBD [article]  inJournal of geotechnical and geoenvironmental engineering > Vol. 138 N° 5 (Mai 2012) . - pp. 633–637 Titre : Pilot-scale application of attapulgitic clay for stabilization of toxic elements in contaminated soil Type de document : texte imprimé Auteurs : V. Zotiadis, Auteur ; A. Argyraki, Auteur ; E. Theologou, Auteur Année de publication : 2012 Article en page(s) : pp. 633–637 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Remediation Attapulgitic clay In situ Stabilization Pilot scale Toxic elements Résumé : This study presents an in situ pilot-scale application of attapulgitic clay for stabilization of toxic metals and metalloids in contaminated soil. The selected field for the pilot-scale experiment was heavily contaminated with toxic metals and metalloids in total (Cu: 122  mg/Kg, Pb: 6,610  mg/Kg, Zn: 3,630  mg/Kg, Cd: 26.3  mg/Kg, Ag: 9.4  mg/Kg, As: 802  mg/Kg, Mn: 1,435  mg/Kg, Ba: 304  mg/Kg, Sb: 95.3  mg/Kg) and leachable concentrations. Geochemical and physical properties of treated soil were thoroughly studied before and after mixing with the attapulgitic clay. Soil mineralogy was determined by X-ray diffraction (XRD) and scanning electron microsope (SEM) techniques. On the basis of the site-specific soil geochemical properties, an appropriate proportion of specific grain-size attapulgitic clay was added and mixed in situ with simultaneous adjustment of soil moisture content to reach saturation. Analytical data of amended soil samples collected 1 month after the application showed a significant reduction of water leachable metal fraction (Cu: 17%, Pb: 50%, Zn: 45%, Cd: 41%, Ag: 46%, As: 18%, Mn: 47%, Ba: 45%, Sb: 29%). In addition, soil pH was stabilized at slightly alkaline conditions and remained constant during a 7-month monitoring period after amending the soil. Overall, the use of attapulgitic clay as a binder for immobilizing metals in contaminated land is a promising stabilization method at a competitive cost under present market conditions. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000620 [article] Pilot-scale application of attapulgitic clay for stabilization of toxic elements in contaminated soil [texte imprimé] / V. Zotiadis, Auteur ; A. Argyraki, Auteur ; E. Theologou, Auteur . - 2012 . - pp. 633–637. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 5 (Mai 2012) . - pp. 633–637 Mots-clés : Remediation Attapulgitic clay In situ Stabilization Pilot scale Toxic elements Résumé : This study presents an in situ pilot-scale application of attapulgitic clay for stabilization of toxic metals and metalloids in contaminated soil. The selected field for the pilot-scale experiment was heavily contaminated with toxic metals and metalloids in total (Cu: 122  mg/Kg, Pb: 6,610  mg/Kg, Zn: 3,630  mg/Kg, Cd: 26.3  mg/Kg, Ag: 9.4  mg/Kg, As: 802  mg/Kg, Mn: 1,435  mg/Kg, Ba: 304  mg/Kg, Sb: 95.3  mg/Kg) and leachable concentrations. Geochemical and physical properties of treated soil were thoroughly studied before and after mixing with the attapulgitic clay. Soil mineralogy was determined by X-ray diffraction (XRD) and scanning electron microsope (SEM) techniques. On the basis of the site-specific soil geochemical properties, an appropriate proportion of specific grain-size attapulgitic clay was added and mixed in situ with simultaneous adjustment of soil moisture content to reach saturation. Analytical data of amended soil samples collected 1 month after the application showed a significant reduction of water leachable metal fraction (Cu: 17%, Pb: 50%, Zn: 45%, Cd: 41%, Ag: 46%, As: 18%, Mn: 47%, Ba: 45%, Sb: 29%). In addition, soil pH was stabilized at slightly alkaline conditions and remained constant during a 7-month monitoring period after amending the soil. Overall, the use of attapulgitic clay as a binder for immobilizing metals in contaminated land is a promising stabilization method at a competitive cost under present market conditions. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000620

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