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Treatment of Arsenic-, Chromium-, Copper- and Pentachlorophenol-Polluted Soil Using Flotation

  • Nicolas Reynier
  • Jean-François BlaisEmail author
  • Guy Mercier
  • Simon Besner
Article

Abstract

Soils polluted by metals and organic compounds are a major challenge in soil remediation and environmental recovery; however, the technology to efficiently decontaminate soils polluted by both metal and organic pollutants does not yet exist. Most of these soils are disposed of in landfills. This study first evaluates chemical reagents (hydrochloric, nitric, sulfuric and lactic acids and ethanol) for leaching metals from soil. Assays were then conducted to evaluate non-ionic, ionic and amphoteric surfactants for pentachlorophenol (PCP) removal by flotation. Finally, a laboratory-scale leaching/flotation process was applied to treat four soil samples polluted with both organic ([PCP]i = 2.5–30 mg kg−1) and metals ([As]i = 50–250 mg kg−1, [Cr]i = 35–220 mg kg−1, [Cu]i = 80–350 mg kg−1) compounds. The organic compounds and metals are concentrated in the froth and liquid fractions, respectively. Removal yields of 82–93 %, 30–80 %, 79–90 % and 36–78 % were obtained from As, Cr, Cu and PCP, respectively, under optimized process conditions (H2SO4 = 1 N, [cocamidopropyl betaine]i = 1 % (w w−1), t = 60 min, T = 60 °C, PD = 10 % (w v−1)). The treatment of the produced leachate was also tested by chemical precipitation using different reagents.

Keywords

Soil washing Flotation Contaminated soil Pentachlorophenol Arsenic Chemical precipitation 

Notes

Acknowledgments

Sincere thanks are extended to the National Sciences and Engineering Research Council of Canada for their financial contribution to this study.

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Nicolas Reynier
    • 1
  • Jean-François Blais
    • 1
    Email author
  • Guy Mercier
    • 1
  • Simon Besner
    • 2
  1. 1.Institut national de la recherche scientifique (Centre Eau, Terre et Environnement)Université du QuébecQuebecCanada
  2. 2.Institut de recherche d’Hydro-Québec (IREQ)VarennesCanada

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