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Variation of green liquor dregs from different pulp and paper mills for use in mine waste remediation
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering. Department of Environment and Minerals Resources, Greenland Institute of Nature Resources, Nuuk, Greenland.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering. Swedish Geological Survey AB, Luleå, Sweden.ORCID iD: 0000-0002-5010-4815
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering. Department of Energy and Environment Engineering, Quaid-e-Awam University of Engineering, Science & Technology, Nawabshah, Pakistan.ORCID iD: 0000-0003-2810-8083
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
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2019 (English)In: Environmental science and pollution research international, ISSN 0944-1344, E-ISSN 1614-7499, Vol. 26, no 30, p. 31284-31300Article in journal (Refereed) Published
Abstract [en]

The geotechnical, chemical, and mineralogical properties of green liquor dregs (GLDs) generated as byproducts from five paper mills were investigated to assess their buffering and heavy metal immobilization capacities and their roles as water and oxygen barriers. One type of GLD was further studied to test the effects of the retrieval process and the storage, drying, and hydration of GLD. The high water retention capacity of the GLDs is valuable for limiting O2diffusion. Laboratory results showed that the GLDs had hydraulic conductivities of 3.7 × 10−9–4.6 × 10−8 m/s and varied regularly in plasticity. The chemical and mineralogical compositions of the GLDs varied greatly, reflecting the raw material used to produce paper and the process used to retrieve GLDs. Although they had high total heavy metal contents, none of the leached elements from the GLDs (L/S 10 cm3/kg) exceeded the European Union’s limits for landfills of non-hazardous waste. The GLDs exhibited high buffering capacities. In a supplementary test, the buffering capacities varied (0.0041–0.0114 M H+/g GLD) over 72 d after acid was added to the GLD. Changing the filtration process did not greatly affect the GLDs’ properties but mainly affected the hydraulic conductivity, total heavy metal contents and sulfur content. Analyzing the storage of GLDs is necessary in the mining industry because remediation measures require large amounts of material over short periods. The buffering capacity of the dried GLD decreased slightly. The effect of dewatering caused by the mixing of 2% Na-lignosulfate with GLD (w/w) was low.

Place, publisher, year, edition, pages
Springer, 2019. Vol. 26, no 30, p. 31284-31300
Keywords [en]
Acid neutralization, Buffering capacity, Heavy metals, Water retention, Plasticity, Beneficiation
National Category
Geotechnical Engineering Geochemistry
Research subject
Applied Geochemistry; Soil Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-75826DOI: 10.1007/s11356-019-06180-0ISI: 000494047900065PubMedID: 31471848OAI: oai:DiVA.org:ltu-75826DiVA, id: diva2:1348202
Note

Validerad;2019;Nivå 2;2019-11-22 (johcin)

Available from: 2019-09-03 Created: 2019-09-03 Last updated: 2019-11-22Bibliographically approved

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Jia, YuHamberg, RogerQureshi, AsifMäkitalo, MariaMaurice, Christian

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