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SOIL WASHING OPTIMIZATION, RECYCLING OF THE SOLUTION, AND ECOTOXICITY ASSESSMENT FOR THE REMEDIATION OF PB-CONTAMINATED SITES USING EDDS
Fabbricino, M., A. Ferraro, V. Luongo, L. Pontoni, and M. Race.
Sustainability 10(3):636(2018)

Researchers investigated the applicability of ethylenediamine-N,N'-disuccinic acid (EDDS) as a washing solution for remediation of Pb-contaminated soil. All aspects of the treatment were optimized, including reuse and final disposal of the spent EDDS solution. Different molar concentrations of the washing solutions and the efficiencies of varying solid/liquid ratio were tested at different pH values. More than 90% of the mobile Pb fraction was removed in about 24 h at pH 6, and soil toxicity was strongly decreased. The regenerated solution exhibited a reduced but still useful extractive capacity. Total Pb extraction was ~50% of the initial value after the first regeneration cycle and almost 20% after the second regeneration cycle. Respirometric tests, conducted using an activated sludge sampled in a municipal wastewater treatment plant, indicated that the spent solutions though not biodegradable exerted no toxic effect on the biomass. Tests on regenerated solutions displayed the same biodegradability as the fresh ones. http://www.mdpi.com/2071-1050/10/3/636/pdf



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