Effects of wood ash on physicochemical and morphological characteristics of sludge-derived hydrochar pellets relevant to soil and energy applications

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dc.contributor.authorMohammadi, Ali
dc.contributor.authorAnukam, Anthony Ike
dc.contributor.authorGranström, Karin
dc.contributor.authorEskandari, Samieh
dc.contributor.authorZywalewska, Martyna
dc.contributor.authorSandberg, Maria
dc.contributor.authorAladejana, Elizabeth Bosede 0000-0003-4658-5596
dc.date.accessioned2026-02-15T20:47:50Z
dc.date.available2026-02-15T20:47:50Z
dc.date.issued2022-07-22
dc.description.abstractHydrochar is produced through a process called hydrothermal carbonization (HTC) and constitutes a carbon-rich solid material with different remarkable applications. This study investigated the effects of wood ash on the physicochemical and morphological properties of biosludge-derived hydrochar in pelleted form relevant to the use of the pellets as a soil nutritional and liming agent and as a biofuel source. The hydrochar was mechanically compressed into uniformly-sized pellets under applied pressures of 4 and 8 kN after blending with varying percentages of wood ash in the order 0, 20 and 50%. The pure and blended pellets were characterized to determine the impact of wood ash on key properties, correlated to the two applications mentioned above. Results demonstrated a strong relationship between key features of the pellets and ash proportion. The wood ashblended hydrochar pellets showed good hydrophobicity as a consequence of increased contents of alkali and alkaline earth metals, but were low in aromatic functional groups compared to the pure hydrochar pellet. Furthermore, the heating value of the pure hydrochar pellet was about 4% higher than that of its parent material and indicates that this pellet has the capacity to serve as a source of energy. The study generally reveals that blending hydrochar produced from biosludge under HTC conditions with up to 20%–50% of wood ash and mechanically compressing into homogeneous pellets has promising potential for a nutrient-rich material that can enhance soil fertility.
dc.description.sponsorshipThe authors wish to thank ÅForsk agency in Sweden for funding the study under the grant number “19-622”, and also for providing the biosludge-derived hydrochar powder.
dc.identifier.citationAladejana E; Mohammadi A; Anukam A; Granstom K; Eskandari S; Zywalewska M; Sandberg M (2022): Effects of wood ash on physicochemical and morphological characteristics of sludge-derived hydrochar pellets relevant to soil and energy applications: Biomass and Bioenergy, 163(2022). https://doi.org/10.1016/j.biombioe.2022.106531
dc.identifier.urihttp://hdl.handle.net/20.500.11837/3711
dc.language.isoen
dc.publisherElsevier
dc.subjectScanning electron microscopic analysis
dc.subjectElemental composition
dc.subjectEnrichment
dc.subjectSoil amendment
dc.subjectHeating value
dc.titleEffects of wood ash on physicochemical and morphological characteristics of sludge-derived hydrochar pellets relevant to soil and energy applications
dc.typeArticle

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