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Use of surfactants and blends to remove DDT from contaminated soils

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Abstract

Removal of dichloro-diphenyl-trichloroethane (DDT) from soils using surfactant-enhanced solubilisation was studied both in batch and continuous flow arrangements to determine if there were advantages to using a combination of non-ionic (Tween and Brij) and anionic surfactants. It was observed that the presence of the anionic surfactant sodium dodecyl benzene sulphonate improved the DDT removal efficiency, but had a potentially negative effect on flow rates in column leaching experiments at concentrations over 0.1%. The potential for re-use of the surfactant mixture was studied and demonstrated by removing DDT and its metabolites from the surfactant solution using activated carbon. © 2011 Canadian Society for Chemical Engineering

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