Metal transport parameters of a gneiss saprolitic silty soil for liner design

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dc.contributor.authorStuermer M.M.
dc.contributor.authorGimenez Boscov M.E.
dc.contributor.authorde Oliveira E.
dc.date.accessioned2024-03-13T01:37:38Z
dc.date.available2024-03-13T01:37:38Z
dc.date.issued2008
dc.description.abstractDiffusion coefficients and retardation factors of two metal cations (Cd2+ and Pb2+) were measured for a compacted Brazilian saprolitic soil derived from gneiss, aiming to assess its geoenvironmental performance as a liner for waste disposal sites. This soil occurs extensively all over the country in very thick layers, but has not been used in liners because of its hydraulic conductivity, higher than 10-9 m/s when compacted at optimum water content of standard Proctor energy, but which can be reduced by means of appropriate compaction techniques or additives. Batch, column, and diffusion tests were carried out with monospecies synthetic solutions at pH 1, 3, and 5.5. Measured diffusion coefficients varied between 0.5 and 4 × 10-10 m2/s. Retardation factors show that cadmium, a very mobile cation, is not adsorbed at pH 1 but is significantly retained at pH 3 and pH 5.5, whereas lead is retained at all tested pH values though slightly at pH 1. Estimated retardation factors from batch tests were 1.3-2.3 times those resulting from column tests and at its highest when obtained by diffusion tests; whereas batch tests allow a more complete exposure of the soil grains to the solution, time-dependent nonspecific adsorption may take longer to occur. The importance of contact time was observed and should be considered in further investigations. Its significant retention of metals suggests a promising utilization of this soil as a bottom liner for wastes landfills.
dc.description.firstpage509
dc.description.issuenumber4
dc.description.lastpage518
dc.description.volume134
dc.identifier.doi10.1061/(ASCE)1090-0241(2008)134:4(509)
dc.identifier.issn1090-0241
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/37525
dc.relation.ispartofJournal of Geotechnical and Geoenvironmental Engineering
dc.rightsAcesso Restrito
dc.subject.otherlanguageCompacted soils
dc.subject.otherlanguageDiffusion
dc.subject.otherlanguageHeavy metals
dc.subject.otherlanguageLaboratory tests
dc.subject.otherlanguageParameters
dc.subject.otherlanguageResidual soils
dc.subject.otherlanguageSilts
dc.subject.otherlanguageSorption
dc.titleMetal transport parameters of a gneiss saprolitic silty soil for liner design
dc.typeArtigo
local.scopus.citations8
local.scopus.eid2-s2.0-41049088185
local.scopus.subjectCompacted soil
local.scopus.subjectLaboratory test
local.scopus.subjectResidual soil
local.scopus.subjectRetardation factor
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=41049088185&origin=inward
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