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Effects of sewage sludge application on heavy metal leaching from mine tailings impoundments.pdf

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Effects of sewage sludge application on heavy metal leaching from mine tailings impoundments

Available online at Bioresource Technology 99 (2008) 7521–7530Effects of sewage sludge application on heavy metal leaching from mine tailings impoundments Navarro Flores Andre?s a,*, Mart??nez Sola Francisco b aDep. M. Fluidos, ETSEIAT, Universidad Polite?cnica de Catalun?a (UPC), Colo?n 7, 08222 Terrassa, Spain bDSM Deretil S.A., Villaricos, 04618 Cuevas del Almanzora, Almer??a, Spain Received 5 October 2007; received in revised form 12 February 2008; accepted 14 February 2008 Available online 26 March 2008Abstract Column experiments were conducted to investigate the removal of heavy metals from two mine tailings (El Arteal and Jarav??as) using sewage sludge as a reactive material. When sewage sludge is used as a reactive material on the El Arteal tailings (sample SA), Fe, Mn, Zn and Pb are removed and Cu and Ni are mobilized. The experiments carried out on the Jarav??as tailings give similar results, showing the retention of Cu, Pb, Fe and Mn and the mobilization of Ni and Zn. An analysis performed using the PHREEQC numerical code suggests that the retention of Fe in the sewage sludge may be caused by the precipitation of Fe(OH)2.7Cl0.3 and possibly pyrite, and that the reten- tion of Pb at high pH may be caused by the formation of stable phase minerals such as Pb(OH)2 and PbS in these conditions. Ni mobi- lization in the column experiments with the two tailings samples may be caused by the presence of significant amounts of leachable Ni in the sewage sludge. The complexation of metals with dissolved organic matter, calculated with the Minteq model, may be moderate. 2008 Elsevier Ltd. All rights reserved. Keywords: Sewage sludge; Contamination; Metals; Mine tailings; Remediation1. Introduction Many authors have studied the contamination problems associated with the presence of metals in soils and aquifers caused by mining activities in various locations (Fo?rstner and Wittman, 1979; EPA, 1996; McGregor et al., 1998; Blowes and Jambor, 1990; Blowes and Ptacek, 19