Spent coffee grounds anaerobic digestion: Investigating substrate to inoculum ratio and dilute acid thermal pretreatment

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dc.authoridKumar, Gopalakrishnan/0000-0002-7848-5138
dc.contributor.authorSemaan, Georgeio
dc.contributor.authorAtelge, M. R.
dc.contributor.authorCayetano, Roent Dune
dc.contributor.authorKumar, Gopalakrishnan
dc.contributor.authorKommedal, Roald
dc.date.accessioned2024-12-24T19:27:07Z
dc.date.available2024-12-24T19:27:07Z
dc.date.issued2023
dc.departmentSiirt Üniversitesi
dc.description.abstractSpent coffee grounds have the potential of being used in further bioprocesses to produce materials and fuels. In Norway, the relative abundance and ease of collection of this waste substrate make it a candidate for investi-gation. For this study, the substrate-to-inoculum ratio as well as a combined dilute acid-thermal pretreatment were assessed by a series of biochemical methane potential assays using spent coffee grounds as a substrate. Reactors with substrate-to-inoculum ratio 2 demonstrated a relatively low hydrolysis rate constant (kh) and comparatively high volatile fatty acids/alkalinity concentrations rendering them inapt to produce bio-CH4. Pretreatment was conducted over varying contact times (15-45 min), dilute acid concentrations (1.5-2.5 %, v/ v), and liquid-to-solid ratios (10-20 %, v/w) and evaluated using response surface methodology. To determine bio-CH4 yield, pretreatment time and the interaction between acid concentration and liquid-to-solid ratio are considered significant variables, suggesting a shared importance. Chemical oxygen demandremoval is primarily contingent upon changes in liquid-to-solid ratio. Finally, Fourier-transform infrared spectroscopy of the dis-carded solid phase showed that the major functional groups are still widely present in the coffee grounds even after pretreatment was applied. A better understanding of the biodegradability profile of spent coffee grounds as a function of substrate-to-inoculum ratio is achieved.
dc.identifier.doi10.1016/j.fuel.2022.125598
dc.identifier.issn0016-2361
dc.identifier.issn1873-7153
dc.identifier.scopus2-s2.0-85136517031
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1016/j.fuel.2022.125598
dc.identifier.urihttps://hdl.handle.net/20.500.12604/6514
dc.identifier.volume331
dc.identifier.wosWOS:000863103400004
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier Sci Ltd
dc.relation.ispartofFuel
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_20241222
dc.subjectAcid thermal pretreatment
dc.subjectAnaerobic digestion
dc.subjectBox behnken design
dc.subjectSpent coffee grounds
dc.subjectSubstrate to inoculum ratio
dc.titleSpent coffee grounds anaerobic digestion: Investigating substrate to inoculum ratio and dilute acid thermal pretreatment
dc.typeArticle

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