1. Hydrothermal co-carbonization of sewage sludge and whey : enhancement of product properties and potential application in agricultureAleksandra Petrovič, Tjaša Cenčič, Lidija Škodič, Sabina Vohl, Lidija Čuček, 2023, original scientific article Keywords: hydrothermal co-carbonization, sewage sludge, cheese whey, product characterisation, potential application
Published in DKUM: 24.02.2025; Views: 0; Downloads: 6
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2. Valorization of biomass through anaerobic digestion and hydrothermal carbonization : integrated process flowsheet and supply chain network optimizationSanja Potrč, Aleksandra Petrovič, Jafaru Musa Egieya, Lidija Čuček, 2025, original scientific article Abstract: Utilization of biomass through anaerobic digestion and hydrothermal carbonization is crucial to maximize resource efficiency. At the same time, supply chain integration ensures sustainable feedstock management and minimizes environmental and logistical impacts, enabling a holistic approach to a circular bioeconomy. This study presents an integrated approach to simultaneously optimize the biomass supply chain network and process flowsheet, which includes anaerobic digestion, cogeneration, and hydrothermal carbonization. A three-layer supply chain network superstructure was hence developed to integrate the optimization of process variables with supply chain features such as transportation modes, feedstock supply, plant location, and demand location. A mixed-integer nonlinear programming model aimed at maximizing the economic performance of the system was formulated and applied to a case study of selected regions in Slovenia. The results show a great potential for the utilization of organic biomass with an annual after tax profit of 23.13 million USD per year, with the production of 245.70 GWh/yr of electricity, 298.83 GWh/yr of heat, and 185.08 kt/yr of hydrochar. The optimal configuration of the supply chain network, including the selection of supply zones, plant locations and demand locations, transportation links, and mode of transportation is presented, along with the optimal process variables within the plant.
Keywords: anaerobic digestion, hydrothermal carbonization, supply chain optimization, process flowsheet optimization, mathematical programming
Published in DKUM: 07.02.2025; Views: 0; Downloads: 7
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3. Sustainable hydrothermal co-carbonization of residues from the vegetable oil industry and sewage sludge : hydrochar production and liquid fraction valorisationAleksandra Petrovič, Tjaša Cenčič, Jelena Parlov Vuković, Tomislav Jednačak, Silvo Hribernik, Sabina Vohl, Danijela Urbancl, Marina Tišma, Lidija Čuček, 2024, original scientific article Abstract: In this study, the hydrothermal co-carbonization (co-HTC) of residues from the vegetable oil industry (pumpkin oil cake– PC, hemp oil cake– HC) and sewage sludge (SS) was investigated for the first time. The co-HTC was performed at 250 C and atreatment time of 5 h. The effects of the mass ratio of the feedstocks (1:1, 1:3 and 3:1) on the properties of the HTC products were investigated using various analytical methods (NMR, XRD, 3D-EEM, FTIR, etc.). The co-HTC of SS with oil cakes resulted in improved fuel properties of the hydrochar and an increase in C content from 36.9 to 53.7 wt%, and an increase in the higher heating value (HHV) from 14.8 to 23.6 MJ/kg. The combination with HC gave hydrochars with a higher HHV and higher C content than the combination with PC. The hydrochar yield varied in the range of 39.4–55.3 wt%. NMR analysis revealed a higher proportion of aliphatic (~60 %) than aromatic compounds (~35 %) in the hydrochars, as well as a high content of orthophosphate and unsaturated fatty acids. The liquid fractions were rich in nutrients and organic compounds, but toxic to aquatic organisms. The hydrochars and liquid fractions performed well in the germination test with plant species.
Keywords: hydrothermal co-carbonization, sewage sludge, vegetable oil industry residues, hydrochar, liquid fraction, valorisation
Published in DKUM: 17.01.2025; Views: 0; Downloads: 11
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4. Hydrothermal conversion of oilseed cakes into valuable products : influence of operating conditions and whey as an alternative process liquid on product properties and their utilizationAleksandra Petrovič, Tjaša Cenčič, Sabina Vohl, Gregor Hostnik, Matjaž Finšgar, Lidija Čuček, 2024, original scientific article Keywords: hydrothermal carbonization, hydrochar, process liquid, oilseed press cake, cheese whey, catalyst
Published in DKUM: 29.08.2024; Views: 64; Downloads: 16
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5. Assessing energy potential and chemical composition of food waste thermodynamic conversion products: a literature reviewAndreja Škorjanc, Darko Goričanec, Danijela Urbancl, 2024, original scientific article Abstract: This study examines the considerable volume of food waste generated annually in Slovenia, which amounted to over 143,000 tons in 2020. The analysis shows that 40% of food waste consists of edible parts, highlighting the potential for reduction through increased consumer awareness and attitudes towards food consumption. The study shows that the consumption phase contributes the most to waste food (46%), followed by primary production (25%) and processing/manufacture (24%). The study addresses various thermodynamic processes, in particular, thermal conversion methods, such as torrefaction pyrolysis and hydrothermal carbonization, which optimize energy potential by reducing the atomic ratio (H/C) and (O/C), thereby increasing calorific value and facilitating the production of solid fuels. The main results show the effectiveness of torrefaction, pyrolysis and hydrothermal carbonization (HTC) in increasing the energy potential of food waste.
Keywords: energy, thermodynamic conversions, pyrolysis, torrefaction, hydrothermal carbonization, food waste, energy potential, chemical composition
Published in DKUM: 28.08.2024; Views: 53; Downloads: 14
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7. Carbon foams via ring-opening metathesis polymerization of emulsion templates : a facile method to make carbon current collectors for battery applicationsSebastijan Kovačič, Bettina Schafzahl, Nadejda B. Matsko, Katharina Gruber, Martin Schmuck, Stefan Koller, Stefan A. Freunberger, Christian Slugovc, 2022, original scientific article Keywords: emulsion templating, carbonization, ROMP, polyHIPEs, porous cathode
Published in DKUM: 10.04.2024; Views: 213; Downloads: 22
Full text (12,66 MB)
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