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Clays and Clay Minerals; December 2003; v. 51; no. 6; p. 609-615; DOI: 10.1346/CCMN.2003.0510603
© 2003 Clay Minerals Society
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REMEDIATION OF Cd- AND Pb-POLLUTED SOIL BY TREATMENT WITH ORGANO-ZEOLITE CONDITIONER

Elio Coppola1, Giampiero Battaglia1, Maria Bucci1, Donato Ceglie2, Abner Colella3, Alessio Langella4, Andrea Buondonno1,* and Carmine Colella5

1 Dipartimento di Scienze Ambientali, Seconda Università degli Studi di Napoli, Via Vivaldi 43, 81100 Caserta, Italy
2 Procura della Repubblica, Tribunale di Santa Maria Capua Vetere, Piazza della Resistenza, 81055 Santa Maria Capua Vetere, Caserta, Italy
3 Dipartimento di Scienze della Terra, Università degli Studi di Napoli Federico II, Via Mezzocannone 8, 80134 Napoli, Italy
4 Dipartimento di Studi Geologici ed Ambientali, Facoltà di Scienze, Università degli Studi del Sannio, Via Port’Arsa 11, 82100 Benevento, Italy
5 Dipartimento di Ingegneria dei Materiali e della Produzione, Università degli Studi di Napoli Federico II, Piazzale Tecchio 80, 80125 Napoli, Italy

* E-mail address of corresponding author: andrea.buondonno{at}unina2.it

The present work is part of a study focused on the use of organo-zeolite conditioner to remediate soil polluted by toxic elements. The Neapolitan yellow tuff (NYT) was utilized as a component of an organo-mineral sorbent/exchanger soil conditioner with pellet manure (NYT/PM) to reduce the mobility of Cd and Pb and recover plant performance in heavily polluted soils from illegal dumps near Santa Maria La Fossa (Lower Volturno river basin, Campania Region, southern Italy). Pot experiments were performed by adding the NYT/PM mixture (1:1, w/w) to polluted soil at the rates of 0%, 25%, 50% or 75% (w/w). Wheat (Triticum aestivum) was used as the test plant. The addition of organo-zeolite NYT/PM mixture significantly reduced the DTPA (diethylene-triamine-pentaacetic acid)-extractable Cd and Pb from 1.01 and 97.5 mg kg–1 in the polluted soil, to 0.14 and 11.6 mg kg–1, respectively, in the soil amended with 75% NYT/PM. The best plant response was observed in amended soil systems treated with 25% NYT/PM, whereas larger additions induced plant toxicities due to increased soil salinity.

Key Words: Illegal Dumps • Ion Exchange • Natural Zeolites • Polluted Soils • Soil Remediation • Toxic Elements






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