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Hydrothermal carbonisation of peat-based spent sorbents loaded with metal(loid)s
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0001-5375-8825
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
Department of Sustainable Development, Environmental Science and Engineering, Royal Institute of Technology, Stockholm.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0002-1442-1573
2019 (English)In: Environmental science and pollution research international, ISSN 0944-1344, E-ISSN 1614-7499, Vol. 26, no 23, p. 23730-23738Article in journal (Refereed) Published
Abstract [en]

Hydrothermal carbonisation (HTC) is a wet and relatively low-temperature process where, under autogenous pressures, biomass undergoes a chain of reactions leading to the defragmentation of organic matter. As well as its other uses (e.g. for producing low-cost carbon-based nano-compounds), HTC is utilised for the treatment of wet wastes, such as manure and biosludge. This study aimed to determine if hydrothermal carbonisation is a feasible treatment method for spent sorbents that are highly enriched with arsenic, chromium, copper, and zinc. The chemical properties of hydrochar and process liquid were evaluated after HTC treatment, where peat-based spent sorbents were carbonised at 230 °C for 3 h. Analysis of Fourier transform-infrared spectra revealed that during HTC, the oxygenated bonds of ethers, esters, and carboxylic groups were cleaved, and low-molecular-weight organic fragments were dissolved in the process liquid. A large fraction of arsenic (up to 62%), copper (up to 25%), and zinc (up to 36%) were transferred from the solids into the process water. Leaching of these elements from the hydrochars increased significantly in comparison with the spent sorbents.

Place, publisher, year, edition, pages
Springer, 2019. Vol. 26, no 23, p. 23730-23738
Keywords [en]
Metals, Adsorption, Thermal treatment, Iron-peat, Post-sorption management, HTC
National Category
Other Environmental Engineering
Research subject
Waste Science and Technology
Identifiers
URN: urn:nbn:se:ltu:diva-75121DOI: 10.1007/s11356-019-05653-6ISI: 000477958300045OAI: oai:DiVA.org:ltu-75121DiVA, id: diva2:1332743
Note

Validerad;2019;Nivå 2;2019-08-20 (johcin)

Available from: 2019-06-28 Created: 2019-06-28 Last updated: 2019-08-20Bibliographically approved

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Kasiuliene, AlfredaCarabante, IvanKumpiene, Jurate

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