2421 KB0 KB199820242024Gornik Bučar, DominikaGospodarič, BojanPrislan, PeterVerhovšek, Dejanštevilka:1letnik:73str. 69-80COBISSID_HOST:200904451ISSN:2590-9932URN:URN:NBN:SI:doc-PVRJYFYNslZaložba UniverzeLes (Ljubljana)bio wastebiološki odpadkicalorific valuekakovost peletovkurilna vrednostostanki mlete kavepeletipelletspellets qualitysawdustspent coffee groundsžagovinaPrimernost ostankov mlete kave za proizvodnjo peletov| Suitability of spent ground coffee for pellet production|In order to achieve the European energy and climate policy goal of climate neutrality by 2050, it is necessary to activate various available renewable energy sources, including biological residues or waste. One such biological waste, which is produced in large quantities and usually enters the environment unprocessed, is spent ground coffee. As spent ground coffee consist of cellulose, hemicellulose, lignin and proteins, it has great potential as a biofuel, and could partially replace wood biomass in the production of pellets. In our research, we have produced pellets under laboratory conditions from spent ground coffee to which we have added different proportions (0%, 25%, 50%, 75%) of sawdust. We determined the properties of the pellets and categorized them into quality classes based on the measured values according to the SIST EN ISO 17225-6:2021 standard. We found that pellets with a higher proportion of spent ground coffee residues have a higher calorific value, higher ash content and lower mechanical durability. Pellets made from spent ground coffee residues with the addition of sawdust (50% or more) show promising properties for use as a raw material for pellet productionZa doseganje cilja evropske energetsko-podnebne politike, da do leta 2050 dosežemo podnebno nevtralnost s prehodom na obnovljive vire energije, je potrebno aktivirati različne razpoložljive obnovljive vire, vključno z biološkimi ostanki oz. odpadki. Eden od takih bioloških odpadkov, ki nastaja v velikih količinah in se večinoma nepredelan odlaga v okolje, so ostanki mlete kave. Ker ostanke mlete kave sestavljajo celuloza, hemiceluloza, lignin in proteini, predstavljajo velik potencial tudi kot biogorivo, ki lahko delno nadomesti lesno biomaso pri proizvodnji peletov. V raziskavi smo v laboratorijskih pogojih izdelali pelete iz ostankov mlete kave, ki smo jim dodali različne deleže (0 %, 25 %, 50 %, 75 %) žagovine. Izdelanim peletom smo določili lastnosti in jih glede na izmerjene vrednosti razvrstili v kakovostne razrede po standardu SIST EN ISO 17225-6:2021. Ugotovili smo, da imajo peleti z večjim deležem ostankov mlete kave višjo kurilno vrednost, večjo vsebnost pepela ter nižjo mehansko obstojnost. Peleti, izdelani iz ostankov mlete kave in dodatkom žagovine (50 % ali več), izkazujejo obetavne lastnosti kot vhodna surovina za proizvodnjo peletovTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaZveza lesarjev Slovenije