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Recovery of soils contaminated with heavy metals: preliminary results

Castaldi, Paola and Santona, Laura and Cozza, Claudio and Giuliano, Veronica and Abbruzzese, Carlo and Melis, Pietro (2004) Recovery of soils contaminated with heavy metals: preliminary results. Fresenius Environmental Bulletin, Vol. 13 (11b), p. 1232-1236. ISSN 1018-4619. Article.

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Abstract

This paper assesses the heavy metal absorption capacity of a natural zeolite to evaluate whether it can be used to reduce metal mobility and bioavailability, and also to recover polluted soil. In the experiments zeolite was artificially polluted at controlled pH and temperature values with solutions containing increasing concentrations of three heavy metals (Pb, Zn and Cd). The results showed that the zeolite absorption preference for the heavy metals was as follows: Pb > Cd > Zn. The isotherm for Pb was L-TYPE, which is typically found when metal affinity is high in the initial steps of the absorption. Zn and Cd were absorbed less by the zeolites. Their isotherms were C and L-TYPE, respectively. After contamination all samples were treated with solutions of gradually increasing extracting capacity (H2O, Ca(NO3)2 0.1N, EDTA 0.05N) to study the role of different heavy metal-zeolite interaction mechanisms. The results showed that the non-extracted Pb fraction was constant in the different metal concentrations in solution. By contrast, the non-extracted Zn and Cd fractions increased as the concentrations of the two heavy metals increased. Thus we conclude that the zeolite examined may be profitably used for recovering soils polluted with Pb, Zn and Cd, but in different amounts depending on the particular chemical species.

Item Type:Article
ID Code:7319
Status:Published
Refereed:Yes
Uncontrolled Keywords:Natural zeolite, heavy metals, absorption, remediation technologies
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/13 Chimica agraria
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze ambientali agrarie e biotecnologie agro-alimentari
Publisher:PSP - Parlar Scientific Publications
ISSN:1018-4619
Additional Information:Presented at the 12th International Symposium on Environmental pollution and its impact on life in the Mediterranean region (MESAEP & SECOTOX), Antalya, Turkey, 04–08 October 2003.
Deposited On:03 Apr 2012 14:11

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