Hydrothermal carbonisation of peat-based spent sorbents loaded with metal(loid)s

Kasiuliene, AlfredaLuleå tekniska universitet,Geovetenskap och miljöteknik (author)

Validerad;2019;Nivå 2;2019-08-20 (johcin)
QC 20191025
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.

Carabante, IvanLuleå tekniska universitet,Geovetenskap och miljöteknik(Swepub:ltu)ivacar (author)
Bhattacharya, Prosun,1962-KTH,Hållbar utveckling, miljövetenskap och teknik,Department of Sustainable Development, Environmental Science and Engineering, Royal Institute of Technology, Stockholm(Swepub:kth)u19v7ore (author)
Kumpiene, JurateLuleå tekniska universitet,Geovetenskap och miljöteknik(Swepub:ltu)juku (author)
Luleå tekniska universitetGeovetenskap och miljöteknik (creator_code:org_t)

In:Environmental Science and Pollution Research: Springer26:23, s. 23730-237380944-13441614-7499

By the author/editor: Kasiuliene, Alfr ...; Carabante, Ivan; Bhattacharya, Pr ...; Kumpiene, Jurate

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Environmental En ...; and Other Environmen ...

By the university: Luleå University of Technology; Royal Institute of Technology

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