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Metal solubility and transport at a contaminated landfill site – From the source zone into the groundwater
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
Swedish Geotechnical Institute, Sweden.
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.ORCID iD: 0000-0002-3585-2209
Stockholm University, Sweden.
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2019 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 668, p. 1064-1076Article in journal (Refereed) Published
Abstract [en]

Risks associated with metal contaminated sites are tightly linked to material leachability and contaminant mobility. In this study, metal solubility and transport were characterized within a glass waste landfill through i) lysimeter-collection of pore water and standardized batch leaching tests, ii) soil profiles extending from the landfill surface, through unsaturated soil underneath, and into the groundwater zone, and iii) groundwater samples upstream, at, and downstream of the landfill. The soil analyzes targeted both pseudo-total and geochemically active concentrations of contaminant metals (As, Cd, Pb, Sb) and basic soil geochemistry (pH, org. C, Fe,Mn). Water samples were analyzed for dissolved, colloid-bound and particulate metals, and speciation modelling of the aqueous phase was conducted. The results revealed a highly contaminated system, with mean metal concentrationsin the waste zone between 90 and 250 times the regional background levels. Despite severe contamination of the waste zone and high geochemically active fractions (80–100%) of all contaminant metals as well as elevated concentrations in landfill pore water, the concentrations of Cd and Pb decrease abruptly at the transition between landfill and underlying natural soil and no indication of groundwater contamination was found. The efficient cation retention is likely due to the high pH. However, the sorption of As and Sb is weaker at such high pH,which explains their higher mobility from the pore water zone into groundwater. The field soil:solution for Pb, ranging from 140 to 2,900,000 l kg−1), despite little variability in basic geochemical variables, which we suggest is due to waste material heterogeneity.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 668, p. 1064-1076
Keywords [en]
Soil and groundwater metal pollution, Glass waste, Soil:Solution partitioning (Kd), Leachability, Mobility, Colloids
National Category
Environmental Sciences
Research subject
Natural Science, Environmental Science
Identifiers
URN: urn:nbn:se:lnu:diva-81555DOI: 10.1016/j.scitotenv.2019.03.013ISI: 000462776800098Scopus ID: 2-s2.0-85062735396OAI: oai:DiVA.org:lnu-81555DiVA, id: diva2:1301176
Funder
The Geological Survey of Sweden (SGU), 36-1778/2014Available from: 2019-04-01 Created: 2019-04-01 Last updated: 2019-08-29Bibliographically approved

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Uddh Söderberg, TereseÅström, Mats E.Svensson, P. AndreasAugustsson, Anna
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