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Hydrothermal carbonisation of peat-based spent sorbents loaded with metal(loid)s
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.ORCID iD: 0000-0003-4350-9950
2019 (English)In: Environmental Science and Pollution Research, 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]
Adsorption, HTC, Iron-peat, Metals, Post-sorption management, Thermal treatment
National Category
Environmental Engineering
Identifiers
URN: urn:nbn:se:kth:diva-262556DOI: 10.1007/s11356-019-05653-6ISI: 000477958300045PubMedID: 31203552Scopus ID: 2-s2.0-85067829043OAI: oai:DiVA.org:kth-262556DiVA, id: diva2:1365753
Note

QC 20191025

Available from: 2019-10-25 Created: 2019-10-25 Last updated: 2020-06-05Bibliographically approved

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Bhattacharya, Prosun

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