Evaluation of the attenuating properties of selected Greek clays for toxic inorganic elements in landfill sites

Mimides, T; Perraki, T

dc.contributor.author	Mimides, T	en
dc.contributor.author	Perraki, T	en
dc.date.accessioned	2014-03-01T01:15:35Z
dc.date.available	2014-03-01T01:15:35Z
dc.date.issued	2000	en
dc.identifier.issn	0048-9697	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13617
dc.subject	clays	en
dc.subject	Greece	en
dc.subject	landfills	en
dc.subject	co-disposal	en
dc.subject	heavy metals	en
dc.subject	predictive attenuation	en
dc.subject.classification	Environmental Sciences	en
dc.title	Evaluation of the attenuating properties of selected Greek clays for toxic inorganic elements in landfill sites	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0048-9697(99)00460-X	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0048-9697(99)00460-X	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	Heavy metal attenuation properties of selected clay material collected from miscellaneous Greek sites is investigated and tested in the laboratory for their suitability, either as liners in hydrologically unsafe sites or as earth covers for sanitary landfill sites. Eleven potentially hazardous elements (As, Be, Cd, Cr, Cu, Hg, Ni, Pb, Se, V, and Zn) generated by a co-disposal landfill leachate have been considered. Experimental column and static equilibrium methods for the determination of dispersion and adsorption are described. Molecular diffusion dominates the migration phenomena with a velocity range between 1.3 x 10(-5) and 3.5 x 10(-4) cm/s throughout the experiments. A simple way to evaluate dispersion coefficients from breakthrough curves gave values of between 3.90 x 10(-6) and 3.5 x 10(-4) cm(2)/s, with a mean value of 1.5 x 10(-5). Static adsorption equilibrium studies supported by column runs showed that Freundlich (F = kC(n)) isotherms express in a better way the assimilative capacities of the tested clays, with k and n values ranging from 0.06 to 1.99 and 0.55 to 1.48 correspondingly. Mathematical models involving non-linear parabolic equations are involved. The experimental data, together with finite difference techniques and some physical clay characteristics, produced trilinear textural diagrams and predictive flow transport convection-dispersion breakthrough curves for a quick estimation of the attenuating properties of clays for heavy metals. (C) 2000 Elsevier Science B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	SCIENCE OF THE TOTAL ENVIRONMENT	en
dc.identifier.doi	10.1016/S0048-9697(99)00460-X	en
dc.identifier.isi	ISI:000087315200001	en
dc.identifier.volume	253	en
dc.identifier.issue	1-3	en
dc.identifier.spage	1	en
dc.identifier.epage	13	en