Optimization of arsenic and pentachlorophenol removal from soil using an experimental design methodology
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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 %).
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.
KeywordsAlkaline leaching Arsenic Pentachlorophenol Experimental design methodology Polluted soil Surfactant
Sincere thanks are extended to the Natural Sciences and Engineering Research Council of Canada and the Canada Research Chairs for their financial contributions.
- ADEME (1998) Connaître pour agir. Guides et cahiers techniques. Agence de l’Environnement et de la Maîtrise de l’Énergie, Angers, France, 128 pGoogle Scholar
- Augustijin-Beckers PWM, Hornsby AG, Wauchope RD (1994) SCS/ARS/CES pesticide properties database for environmental decision making II. Additional compounds. Rev Environ Contam Toxicol 137:6–16Google Scholar
- Barnes HM (2008) Wood preservation trends in North America forest products laboratory. Forest and Wildlife Research Center, Mississippi State University; Mississippi State, Mississippi, 15 pGoogle Scholar
- CCME (1997a) Recommandations canadiennes pour la qualité des sols concernant le PCP: Environnement et Santé humaine. Canadian Council of Ministers of the Environment, Winnipeg, Manitoba, Canada, 61 pGoogle Scholar
- CCME (1997b) Canadian soil guidelines for copper: environmental and human health. Canadian Council of Ministers of the Environment, Winnipeg, Manitoba, Canada, 61 pGoogle Scholar
- Cooper PA, Ung YT (1997) Effect of water repellents on leaching of CCA from treated fence and deck units—an update. International Research Group, IRG/WP 97–50086, Stockholm, SwedenGoogle Scholar
- Fabre G, Ayele J, Mazet L, Lafrance P (1990) Removal of pentachlorophenol by adsorption onto various materials: the effect of organic co-adsorbates (humic substances and lindane). J Water Sci 3:277–292Google Scholar
- Fisher B (1991) Pentachlorophenol: toxicology and environmental fate. J Pesticide Reform 11(1):2–5Google Scholar
- Groenier JC, Lebow S (2006) Preservative-treated wood and alternative products in the forest service. USDA Forest Service Technology and Development Program, TE42G01—Technical Services ECAP; Manitoba, Canada, 49 pGoogle Scholar
- Goupy J (2006) Tutoriel: Les plans d’expériences. Revue Modulad, ed. no. 34Google Scholar
- Henke KR (2009) Arsenic: environmental chemistry, health threats and waste treatment. Wiley, New YorkGoogle Scholar
- Lespagnol G. (2003) Lixiviation du Cr, du Cu et de l’As (CCA) à partir de sols contaminés sur des sites de traitement du bois. PhD thesis, École Nationale Supérieure des Mines, Saint-Étienne, France, 212 pGoogle Scholar
- Reynier N, Blais JF, Mercier G, Besner S (2013) Treatment of arsenic- and pentachlorophenol-polluted soil using flotation. Water Air Soil Pollut 4(224):1–12Google Scholar
- Subramanian B (2007) Exploring neoteric solvent extractants: applications in the removal of sorbates from solid surfaces and regeneration of automotive catalytic converters. University of Cincinnati, Division of Research and Advanced Studies, Cincinnati, 82 pGoogle Scholar
- US Congress (1995) Cleaning up contaminated wood-treating sites. OTA-BP-ENV-164, Office of Technology Assessment, U.S. Government Printing Office, Washington, DC, September, 45 pGoogle Scholar
- World Health Organisation (2003) Pentachlorophenol in drinking-water background fir development of WHO guidelines for drinking-water quality. World Health Organisation, WHO/SDE/WSH/03.04/62, Geneva, Swiss, 18 pGoogle Scholar
- Xiao YF, Liu GM, Dong YL, Yin LL (2008) Rapid determination of pentachlorophenol in soil samples. Yankuang Ceshi 27(2):117–119Google Scholar