The treatments investigated produced a variety of effects in terms of removal of heavy metals and PAHs. For total PAHs, the best results were obtained using H2O2 only as the oxidizing agent (45% removal), and chemically+thermally activated persulfate (up to 72% removal). The kinetics of these chemical oxidation processes was rapid and almost complete in a few hours. Electrooxidation produced up to 44% of total PAHs degradation, whereas no appreciable PAH removal was attained by the electrokinetic treatment. Metal extraction by means of electrokinetics was the highest when both the anodic and the cathodic chambers were conditioned with the complexing agent ethylenediamine tetraacetic acid (EDTA). The following removal yields were obtained: 81% for As, 69% for Cr, 40% for Cu, 33% for Pb, and 22% for Zn.
Lab-scale feasibility tests for sediment treatment using different physico-chemical techniques
DE GIOANNIS, GIORGIA;MUNTONI, ALDO;
2010-01-01
Abstract
The treatments investigated produced a variety of effects in terms of removal of heavy metals and PAHs. For total PAHs, the best results were obtained using H2O2 only as the oxidizing agent (45% removal), and chemically+thermally activated persulfate (up to 72% removal). The kinetics of these chemical oxidation processes was rapid and almost complete in a few hours. Electrooxidation produced up to 44% of total PAHs degradation, whereas no appreciable PAH removal was attained by the electrokinetic treatment. Metal extraction by means of electrokinetics was the highest when both the anodic and the cathodic chambers were conditioned with the complexing agent ethylenediamine tetraacetic acid (EDTA). The following removal yields were obtained: 81% for As, 69% for Cr, 40% for Cu, 33% for Pb, and 22% for Zn.
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