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Treatment of contaminated soil leachate by precipitation, adsorption and ion exchange.

Reynier, Nicolas; Coudert, Lucie; Blais, Jean-François; Mercier, Guy; Besner, Simon (2015). Treatment of contaminated soil leachate by precipitation, adsorption and ion exchange. Journal of Environmental Chemical Engineering , vol. 3 , nº 2. p. 977-985. DOI: 10.1016/j.jece.2015.03.002.

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Résumé

The alkaline washing of soil polluted by organic (pentachlorophenol (PCP) and polychlorinated dioxins and furans (DF)) and inorganic (As, Cr, and Cu) compounds generates large volumes of effluents with high concentrations of contaminants. The objective of the present study is the treatment of leachate produced by a soil decontamination process under alkaline conditions. The alkaline leachate (pH₀ 13.1) initially contains [As]₀ = 14.5 mg L⁻¹, [Cr]₀ = 2.41 mg L⁻¹, (Cu)₀ = 8.22 mg L⁻¹, [PCP]₀ = 6.42 mg L⁻¹ and [DF]₀ = 127 ng TEF L⁻¹. Precipitation allows the reduction of the concentrations to below 5 mg/L for Cu and below 1 mg/L for PCP and As to comply with regulations for effluent discharge in sewer in Quebec City and Montreal. The concentration of Cr was taken into consideration in this study even if it is below the legal limit (5 mg/L) without any treatment. Precipitation is the most efficient technique investigated here for the simultaneous removal of metals and PCP but does not eliminate DF beyond 17%. None of the activated carbons and resins tested can effectively remove As and Cr in strong alkaline media. The anionic resin Lewatit SR7 developed for anion exchange in strong alkaline media is the most effective for the simultaneous removal of Cu, PCP and DF, with recovery yields of 83, 99 and 97%, respectively.

Type de document: Article
Mots-clés libres: ion exchange; leachate; adsorption; precipitation; activated carbon
Centre: Centre Eau Terre Environnement
Date de dépôt: 23 avr. 2018 19:22
Dernière modification: 23 avr. 2018 19:22
URI: http://espace.inrs.ca/id/eprint/3924

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