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Utilisation of chemically stabilized arsenic-contaminated soil in a landfill cover
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0002-1442-1573
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
Department of Plant, Soil and Environmental Sciences, University of Florence.
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2013 (English)In: Environmental science and pollution research international, ISSN 0944-1344, E-ISSN 1614-7499, Vol. 20, no 12, p. 8649-8662Article in journal (Refereed) Published
Abstract [en]

The aim of the study was to determine if an As-contaminated soil, stabilized using zerovalent iron (Fe0) and its combination with gypsum waste, coal fly ash, peat, or sewage sludge, could be used as a construction material at the top layer of the landfill cover. A reproduction of 2 m thick protection/vegetation layer of a landfill cover using a column setup was used to determine the ability of the amendments to reduce As solubility and stimulate soil functionality along the soil profile. Soil amendment with Fe0 was highly efficient in reducing As in soil porewater reaching 99 % reduction, but only at the soil surface. In the deeper soil layers (below 0.5 m), the Fe treatment had a reverse effect, As solubility increased dramatically exceeding that of the untreated soil or any other treatment by one to two orders of magnitude. A slight bioluminescence inhibition of Vibrio fischeri was detected in the Fe0 treatment. Soil amendment with iron and peat showed no toxicity to bacteria and was the most efficient in reducing dissolved As in soil porewater throughout the 2 m soil profile followed by iron and gypsum treatment, most likely resulting from a low soil density and a good air diffusion to the soil. The least suitable combination of soil amendments for As immobilization was a mixture of iron with coal fly ash. An increase in all measured enzyme activities was observed in all treatments, particularly those receiving organic matter. For As to be stable in soil, a combination of amendments that can keep the soil porous and ensure the air diffusion through the entire soil layer of the landfill cover is required.

Place, publisher, year, edition, pages
2013. Vol. 20, no 12, p. 8649-8662
National Category
Other Environmental Engineering
Research subject
Waste Science and Technology
Identifiers
URN: urn:nbn:se:ltu:diva-8426DOI: 10.1007/s11356-013-1818-3ISI: 000327498600035PubMedID: 23709267Scopus ID: 2-s2.0-84891160295Local ID: 6f06c73d-c8b6-496b-8100-0b0dab6b533bOAI: oai:DiVA.org:ltu-8426DiVA, id: diva2:981364
Note

Validerad; 2013; 20130603 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-08-23Bibliographically approved

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Kumpiene, JurateDesogus, PaoloBrännvall, EvelinaLagerkvist, AndersAndreas, LaleSjöblom, Rolf

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