Laboratory-Scale Flotation Process for Treatment of Soils Contaminated with Both PAH and Lead
Publication: Journal of Environmental Engineering
Volume 136, Issue 10
Abstract
A soil decontaminating process has been studied at laboratory scale for the treatment of one soil polluted by both polycyclic aromatic hydrocarbons (PAHs) and lead (Pb). This process first includes attrition and sieving steps to separate the coarse from the fine fractions, followed by a flotation step using an amphoteric surfactant in acid and saline conditions for the treatment of the fine contaminated particles. Electrodeposition and chemical precipitation using sodium hydroxide have been compared to ensure a possible reuse of wastewaters without disturbing the efficiency of the process. The performance of the process has been estimated considering soil quality after treatment with respect to the limit regulatory levels for commercial or industrial use in Quebec (Canada). Precipitation of lead hydroxides was efficient after five cycles of wastewaters reuse, while electrodeposition did not maintain efficiency of the flotation step with regard to PAH levels in soil after treatment. The complete process including Pb precipitation ensured the removal of and of total PAH, respectively, for the coarse and fine fractions, while Pb was removed at and , respectively, for the same fractions of the soil.
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Acknowledgments
This project was funded by the FQRNT and the Montreal Center for Brownfield Rehabilitation.
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Information
Published In
Journal of Environmental Engineering
Volume 136 • Issue 10 • October 2010
Pages: 1063 - 1074
Copyright
© 2010 ASCE.
History
Received: Jul 14, 2009
Accepted: Apr 1, 2010
Published online: Apr 7, 2010
Published in print: Oct 2010
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