Removal of contaminant metals from fine grained soils, using agglomeration, chloride solutions and pile leaching techniques

Tampouris, S; Papassiopi, N; Paspaliaris, I

dc.contributor.author	Tampouris, S	en
dc.contributor.author	Papassiopi, N	en
dc.contributor.author	Paspaliaris, I	en
dc.date.accessioned	2014-03-01T01:17:01Z
dc.date.available	2014-03-01T01:17:01Z
dc.date.issued	2001	en
dc.identifier.issn	0304-3894	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14326
dc.subject	Acidic chloride extraction	en
dc.subject	Agglomeration	en
dc.subject	Clay soils	en
dc.subject	Lead	en
dc.subject	Metals	en
dc.subject	Soil remediation	en
dc.subject.classification	Engineering, Environmental	en
dc.subject.classification	Engineering, Civil	en
dc.subject.classification	Environmental Sciences	en
dc.subject.other	Agglomeration	en
dc.subject.other	Chlorine compounds	en
dc.subject.other	Contamination	en
dc.subject.other	Dissolution	en
dc.subject.other	Hydrogen inorganic compounds	en
dc.subject.other	Leaching	en
dc.subject.other	Lead	en
dc.subject.other	Percolation (fluids)	en
dc.subject.other	pH effects	en
dc.subject.other	Soils	en
dc.subject.other	Fine grained soils	en
dc.subject.other	Hazardous materials	en
dc.subject.other	aluminum	en
dc.subject.other	cadmium	en
dc.subject.other	calcium	en
dc.subject.other	chloride	en
dc.subject.other	copper	en
dc.subject.other	hydrochloric acid	en
dc.subject.other	iron	en
dc.subject.other	lead	en
dc.subject.other	magnesium	en
dc.subject.other	manganese	en
dc.subject.other	metal	en
dc.subject.other	zinc	en
dc.subject.other	agglomeration	en
dc.subject.other	chloride	en
dc.subject.other	leaching	en
dc.subject.other	metal extraction	en
dc.subject.other	remediation	en
dc.subject.other	soil	en
dc.subject.other	article	en
dc.subject.other	clay	en
dc.subject.other	cost effectiveness analysis	en
dc.subject.other	extraction	en
dc.subject.other	leaching	en
dc.subject.other	soil pollution	en
dc.subject.other	soil treatment	en
dc.subject.other	technique	en
dc.subject.other	Aluminum Silicates	en
dc.subject.other	Calcium Chloride	en
dc.subject.other	Environmental Pollution	en
dc.subject.other	Hydrochloric Acid	en
dc.subject.other	Hydrogen-Ion Concentration	en
dc.subject.other	Metals, Heavy	en
dc.subject.other	Particle Size	en
dc.subject.other	Soil Pollutants	en
dc.title	Removal of contaminant metals from fine grained soils, using agglomeration, chloride solutions and pile leaching techniques	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0304-3894(01)00233-3	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0304-3894(01)00233-3	en
heal.language	English	en
heal.publicationDate	2001	en
heal.abstract	A leaching process based on the use of a HCl-CaCl2 solution, with total chloride concentration 4 M, was investigated for the removal of contaminant metals from fine acidic soils. The possibility to apply this treatment on piles constructed on-site was also examined as a low cost treatment option. The soil sample used in the study was fine in texture, i.e. clay loam, acidic (pH 5.6), and contaminated mainly with Pb, up to 16 000 mg Pb/kg dry soil, due to past mining activities. The experimental work comprised all the treatment stages, including agglomeration of fine soil particles to increase the permeability of soil, leaching of the agglomerated soil in a laboratory column, removal of metals from the leachate, regeneration and recycling of the leaching solution and final washing of the treated soil. The initial agglomeration treatment resulted in the formation of coarse aggregates and the percolation of leaching solution through the soil column was maintained at high levels, i.e. 75 ml/cm(2) per day, during the whole treatment. A low amount of HCl acid was required for the removal contaminants from this particular soil, i.e. 0.44 mol HCl/kg soil, due to the absence of acid consuming minerals. The extractions achieved were 94% for Ph, 784b for Zn and more than 70% for Cd. The co-dissolution of soil matrix was very limited, with a total weight loss about 3.5%. The final pH of the soil after washing was found to be 5.15, i.e. slightly lower compared to the initial pH of the soil. The results of this study indicate that chloride leaching, in combination with agglomeration and pile leaching techniques, can be a cost effective option for the removal of metal contaminants from fine acidic soils. (C) 2001 Elsevier Science B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Journal of Hazardous Materials	en
dc.identifier.doi	10.1016/S0304-3894(01)00233-3	en
dc.identifier.isi	ISI:000169667200014	en
dc.identifier.volume	84	en
dc.identifier.issue	2-3	en
dc.identifier.spage	297	en
dc.identifier.epage	319	en