Optimization of arsenic and pentachlorophenol removal from soil using an experimental design methodology |
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| Authors: | Nicolas Reynier Jean-François Blais Guy Mercier Simon Besner |
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| Institution: | 1. Institut National De La Recherche Scientifique, Terre et Environnement, INRS-ETE, 490, rue de la couronne, Québec, Canada, G1K 9A9
2. Institut de recherche d’Hydro-Québec (IREQ), 1800, boul. Lionel-Boulet, Varennes, Qc, J3X1S1, Canada
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| Abstract: | Purpose In this study, a soil-washing process was investigated for arsenic (As) and pentachlorophenol (PCP) removal from polluted soils. This research first evaluates the use of chemical reagents (HCl, HNO3, H2SO4, lactic acid, NaOH, KOH, Ca(OH)2, and ethanol) for the leaching of As and PCP from polluted soils. Materials and methods A Box–Behnken experimental design was used to optimize the main operating parameters for soil washing. A laboratory-scale leaching process was applied to treat four soils polluted with both organic (PCP] i ?=?2.5–30 mg kg?1) and inorganic (As] i ?=?50–250 mg kg?1, Cr] i ?=?35–220 mg kg?1, and Cu] i ?=?80–350 mg kg?1) compounds. Results and discussion Removals of 72–89, 43–62, 52–68, and 64–98 % were obtained for As, Cr, Cu, and PCP, respectively, using the optimized operating conditions (NaOH]?=?1 N, cocamidopropylbetaine] i ?=?2 % w w?1, t?=?2 h, T?=?80 °C, and PD?=?10 %). Conclusions The use of NaOH, in combination with the surfactant, is efficient in reducing both organic and inorganic pollutants from soils with different levels of contamination. |
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