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Sustainability 2018, 10(3), 636; https://doi.org/10.3390/su10030636

Soil Washing Optimization, Recycling of the Solution, and Ecotoxicity Assessment for the Remediation of Pb-Contaminated Sites Using EDDS

1
Department of Civil, Architectural and Environmental Engineering, University of Naples Federico II, via Claudio 21, 80125 Naples, Italy
2
Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, via di Biasio 43, 03043 Cassino, Italy
*
Author to whom correspondence should be addressed.
Received: 18 January 2018 / Revised: 22 February 2018 / Accepted: 26 February 2018 / Published: 28 February 2018
(This article belongs to the Section Sustainable Engineering and Science)
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Abstract

This paper presents the results of an experimental study aimed at investigating the applicability of ethylenediamine-N,N′-disuccinic acid (EDDS) as a washing solution for the remediation of Pb-contaminated soil. All aspects of the treatment are analyzed and optimized, including the reuse and the final disposal of the EDDS spent solution. Different molar concentrations of the washing solutions and the efficiencies of varying solid/liquid ratio are tested at different pH values. More than 90% of the mobile Pb fraction is removed in about 24 h at pH 6. Accordingly, soil toxicity strongly decreases as a consequence of the treatment. The regenerated solution exhibits a reduced, but not negligible, extractive capacity. The total extraction of Pb is approximately 50% of the initial value after one regeneration cycle, and almost 20% after a second regeneration cycle. Respirometric tests, conducted using an activated sludge sampled in a municipal wastewater treatment plant, indicate that the spent solutions are not biodegradable, but they do not exert any toxic effect on the biomass. On the contrary, tests on regenerated solutions displayed the same biodegradability as the fresh ones. View Full-Text
Keywords: EDDS; enhanced soil washing; Pb-contaminated soil; respirometic test; spent solution regeneration EDDS; enhanced soil washing; Pb-contaminated soil; respirometic test; spent solution regeneration
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Fabbricino, M.; Ferraro, A.; Luongo, V.; Pontoni, L.; Race, M. Soil Washing Optimization, Recycling of the Solution, and Ecotoxicity Assessment for the Remediation of Pb-Contaminated Sites Using EDDS. Sustainability 2018, 10, 636.

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