1. The influence of polyphenolic compounds on anaerobic digestion of pepper processing waste during biogas and biomethane productionGregor Drago Zupančič, Anamarija Lončar, Jasmina Ranilović, Drago Šubarić, Mario Panjicko, 2024, original scientific article Abstract: Pepper processing waste has the potential to be used as a substrate in the process of anaerobic digestion, but because of its high polyphenol content, certain limitations are expected. During the determination of the biodegradability of pepper samples, a biogas potential of 687 L/kg DM was observed, as well as a biomethane potential of 401 L/kg DM. While both the testing of biodegradability and the process in the pilot scale progressed, it was observed that total polyphenol content in both cases decreased. Also, as far as individual polyphenols during the process in the pilot scale are concerned, it can be observed that at the end of the process no procyanidin A2, epicatechin, myricetin, and quercetin were detected. The observed concentration of the ferulic acid on the last
day of the process was 0.09 μg/g. Finally, it can be concluded that the presence of polyphenols did
not significantly affect the biogas potential of pepper waste. Due to its relatively stable biogas production,
as far as biogas production on the pilot scale is concerned, it can be concluded that pepper
processing waste has the potential to be used as a substrate for biogas production.
Keywords: anaerobic digestion, polyphenols, ferulic acid, procyanidins, epicatechin, myricetin, quercetin
Published in RUNG: 06.05.2024; Views: 855; Downloads: 5
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2. Biopolymers produced by treating waste brewer’s yeast with active sludge bacteria : the qualitative analysis and evaluation of the potential for 3D printingGregor Drago Zupančič, Anamarija Lončar, Sandra Budžaki, Mario Panjicko, 2022, original scientific article Keywords: brewers’ yeast, active sludge bacteria, anaerobic digestion, biogas potential, biopolymer, 3D printing
Published in RUNG: 01.08.2022; Views: 2202; Downloads: 32
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4. Anaerobic treatment of excess yeast and waste ethanol from alcohol free beer production for increase of renewable energy use in brewing industryGregor Drago Zupančič, Mario Panjicko, Goran Lukić, 2020, published scientific conference contribution Abstract: In the presented paper we have investigated how large quantities of excess yeast and periodical releases of waste ethanol influence the operation of the anaerobic treatment process in a UASB reactor. The process was tested in a pilot-scale reactor with a design organic load of 16.0 kg/m3/day of COD. Through various stages of the experiment, several possible scenarios were tested, excess yeast was added continuously with concentrations up to 3 vol. %, whereas waste ethanol was added in batches of up to 0.8 % of daily volume load several days a week. The intent was to test real conditions in the treatment process. The whole experiment lasted for 77 days, where the maximum organic load of 24.72 kg/m3/day was successfully achieved with no adverse effects on the efficiency of the reactor performance although it significantly surpassed the design load. The COD efficiency at maximum OLR was 83.1 %, whereas the average was 88.0 %. The average biogas production rate increased from 2,044 m3/m3/day to 4.927 m3/m3/day. The microbial community structure analysis showed significant shifts only in the archaeal community (25 – 30 %) as a good adaptation to the addition of substrates. Monitoring the model brewery in applying the addition of yeast and ethanol to the wastewater treatment showed a 110 % increase in biomethane production. The consequence of the increased biomethane production is that the natural gas substitute ratio could be increased from the current average of 10.7 % to potentially 20.1 %, which is a substantial step towards the goal of renewable energy use.
Keywords: anaerobic digestion, biogas, brewery yeast, renewable energy, waste ethanol
Published in RUNG: 10.06.2021; Views: 3127; Downloads: 12
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6. Kružna ekonomija u prehrambenoj industriji i industriji pića, visokovrijedni proizvodi te energetsko i materijalno iskorištavanje otpada i nusproizvodaGregor Drago Zupančič, Mario Panjicko, Anamarija Havliček, Goran Lukić, 2019, published scientific conference contribution abstract Abstract: Prehrambena industrija i industrija pića su s godišnjim prihodima od 1190 milijardi € među najvažnijim granama gospodarstva u EU, koje također proizvode i značajne količine nusproizvoda i otpada. Posljednjih godina, kroz uvođenje strategija kružne ekonomije, posebna pažnja posvećuje se iskorištavanju otpadnih tokova iz kojih je moguća proizvodnja visokovrijednih proizvoda. U ovom radu prikazani su primjeri iz proizvodnje hrane i pića, u kojima je iz nusproizvoda moguće proizvoditi aktivne spojeve kao npr. Resveratrol koji ima antikancerogeni učinak, različite polu proizvode kao što su fenolni spojevi, dodaci u prehrani i sl. U radu je posebna pažnja posvećena pivarskoj industriji gdje se iz nusproizvoda (pivske komine) proizvode prehrambeni proteini te i mljekarskoj industriji gdje se iz sirutke proizvode mliječne kulture, vitamini, laktoza, laktat i proteini (npr. aktoferini, laktoperoksidaze, imunoglobulini). U smislu strategije kružne ekonomije, ostatci nakon dobivanja novih proizvoda, koji više ne sadrže vrijedne tvari, moraju se zbrinuti na odgovarajući način. Najpovoljnija i najčešće upotrebljena tehnologija zbrinjavanja je anaerobna digestija. Anaerobnom digestijom moguće je otpadne tokove zbrinuti na način da se količine otpada smanje i do 90% te da se proizvedeni bioplin upotrijebi kao obnovljiv izvor energije u samom proizvodnom procesu. Time je moguće ostvariti smanjuje emisija ugljičnog dioksida do 50%.
Keywords: cirkularna ekonomija, nusproizvodi, otpad, prehrambena industrija, visokovrijedni proizvodi
Published in RUNG: 11.03.2020; Views: 3855; Downloads: 0
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8. Določitev tehnologije dodajanja velike količine pivovarniškega kvasa in alkohola -etanola v biobed® reaktorGregor Drago Zupančič, Mario Panjicko, Anamarija Havliček, Romana Marinšek-Logar, Goran Lukić, Lijana Fanedl, final research report Keywords: Anaerobna obdelava, odpadni kvas, odpadni alkohol, bioplin, mikrobna biomasa
Published in RUNG: 04.03.2020; Views: 3725; Downloads: 0
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9. Primjena otpadnog perja peradi i ovčje vune za proizvodnju keratinolitičkih enzima i drugih proizvoda s dodanom vrijednošćuRomana Marinšek-Logar, Beti Vidmar, Maša Vodovnik, Gregor Drago Zupančič, Mario Panjicko, 2019, independent scientific component part or a chapter in a monograph Keywords: nusproizvodi, životinjsko podrijetlo, perje peradi, ovčja vuna, keratinaze
Published in RUNG: 04.03.2020; Views: 3610; Downloads: 0
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