Experimental assessment of an innovative process for simultaneous PAHs and Pb removal from polluted soils.
This paper tests a soil washing process using flotation in its effectiveness for the removal of both polycyclic aromatic hydrocarbons (PAHs) and Pb from three polluted soils (soils A, B and C). The optimal flotation conditions were defined as: pulp density=10%, Cocamidopropylhydroxysultaine (CAS)=0.2% ww(-1), [NaCl]=5.5M, pH=3, flotation time=15 min, air flow rate=3l min(-1), stirring speed=1800 rpm and temperature=20 degrees C. Under these conditions, successive flotation stages (n), decreased the contaminant content to below permitted levels (up to 90% PAHs and Pb removal). Thus, a more contaminated matrix required the addition of a growing number of successive flotation stages to lower contamination levels below legal thresholds. While PAHs were distributed within the solid fractions of the process, Pb was mainly present in the liquid fractions. Electrodeposition allowed a total recovery of Pb after 60 min using a 2A electrical current.
Mouton
Julia
J
Institut National de la recherche scientifique (INRS-Eau, Terre et Environnement), Québec, QC, Canada G1K 9A9.
Mercier
Guy
G
Drogui
Patrick
P
Blais
Jean-François
JF
D005591:Chemical Fractionation; D003666:Decontamination; D004563:Electrochemistry; D052918:Environmental Restoration and Remediation / Q000379:methods*; D007220:Industrial Waste; D007854:Lead / Q000737:chemistry*; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry*
D007220:Industrial Waste; D011084:Polycyclic Aromatic Hydrocarbons; D000644:Quaternary Ammonium Compounds; D012989:Soil Pollutants; D013501:Surface-Active Agents; D007854:Lead; C411187:cocamidopropyl hydroxysultaine