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Opis: Zeolite Y was synthesized and modified with EDTA dealumination procedure. The modified zeolites were analyzed by X-ray diffraction, X-ray absorption spectroscopy, chemical analysis and water adsorption measurements. We demonstrated that dealumination with bulk organic acid such as EDTA is able to reduce the original intense water affinity. Furthermore, it was found that dealumination with EDTA, in contrast with steaming and HCl dealumination, provides fully controllable, predictable and secure process of Al removal from the zeolites’ frameworks. The shift of the adsorption isotherm in the low partial pressure range represents an interesting result for adsorption-based applications.
Ključne besede: Zeolite Y Water sorption Dealumination Al XANES EDTA treatment
Objavljeno v RUNG: 05.06.2020; Ogledov: 4320; Prenosov: 0
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Ključne besede: nusproizvodi, životinjsko podrijetlo, perje peradi, ovčja vuna, keratinaze
Objavljeno v RUNG: 04.03.2020; Ogledov: 4200; Prenosov: 0
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Opis: Magistrsko delo Upodobitev ženskega lika v modni fotografiji obravnava zgodovino razvoja modne fotografije in njenega načina upodobitve ženskega lika. Naloga je razdeljena na dva dela, ki iz različnih vidikov razlagata žensko vlogo v modni fotografiji. Prvi del se opira na izbrane modne fotografije in preko njih razlaga razvoj modne fotografije od njenega začetka do danes. Dotika se tudi družbene situacije posameznega obdobja, ki je ključna za razumevanje vsebine modne fotografije. Drugi del se posveča teoretični razlagi ključnih dejavnikov, ki tvorijo modno fotografijo in se dotika učinka modne fotografije na gledalca, vpliva feminizma na modno fotografijo, modernizacije družbe, teorije spola in razvoja idealne ženske podobe. Za temo raziskovanja sem se odločil zaradi želje po poglobljenem razumevanju vpliva fotografije na družbo in njene izpovedne vrednosti. Magistrsko delo se osredotoča na upodobitev ženskega lika tako, da se posveča predvsem interpretaciji fotografij, pristopa ter stila njihovih avtorjev in opredeljevanju razlike med realno in idealno žensko podobo. Po teoretičnem delu sledi opis praktičnega dela magistrske naloge, fotografske serije z naslovom Digitalizacija. Ta obravnava interpretacijo človeškega vstopanja v digitalni svet in prikazuje variacijo njegovega človeškega doživljanja. V zaključku bom pojasnil svoj vidik na razvoj modne fotografije in njen spremenjen vpliv na družbo ter opredelil razlike med resnično in upodobljeno žensko podobo.
Ključne besede: idealizacija, človeško telo, spol, ženstvenost, feminizem, seksizem, fetiš, pripovedna vrednost, modna fotografija, družbena kritika, analogno-digitalno, vizualna umetnost
Objavljeno v RUNG: 11.11.2019; Ogledov: 7009; Prenosov: 213
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Opis: Anaerobic digestion of brewery spent grain as a mono-substrate was studied. Brewery spent grain is a substrate consisting largely of cellulose, hemicellulose and lignin, which are difficult to degrade anaerobically, mostly due to the presence of degradation products, such as phenolic compounds, which cause process inhibition. Therefore, a two-stage system was used for anaerobic digestion. Anaerobic digestion was phase separated in a solid-state anaerobic digestion reactor, where microbiological hydrolysis and acidogenesis occurred and in a granular biomass reactor where mostly methanogenesis was performed. The overall process exhibited total solids degradation efficiency between 75.9 and 83.0 %. Average specific biogas production was 414±32 L/kg, whereas biomethane production was 224±34 L/kg of added total solids. Granular biomass after adaptation exhibited stable operation at substrate C/N ratios in range 0.16 – 4.68. p-cresol was present in concentrations up to 45 mg/L and during the process was successfully degraded by granular biomass. The excellent adaptability of granular biomass was confirmed by 68.2 % shift in bacterial and a 31.8 % shift in archaeal community structure in a granular biomass reactor. The structure of the bacterial community from granular biomass reactor and solid-state anaerobic digestion reactor remained 79.4 % similar at the end of the experiment, whereas archaeal community was only 31.6 % similar. The process exhibited stable operation for 198 days, which shows that brewery spent grain can be successfully anaerobically digested and used for biogas production.
Ključne besede: biogas production, brewery spent grain, C/N ratio, dry digestion, microbial biomass, solid-state anaerobic digestion
Objavljeno v RUNG: 18.08.2017; Ogledov: 5698; Prenosov: 0
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Opis: Anaerobic digestion of brewery spent grain as a mono-substrate was studied. Anaerobic digestion was phase separated in solid state anaerobic digestion reactor, where mostly microbiological hydrolysis and acidogenesis and granular biomass reactor where mostly methanogenesis was performed. The overall process exhibited total solids degradation efficiency between 73.6 and 80.4%. Average specific biogas production was 424±36 L/kg, whereas biomethane production was 230±34 L/kg of brewery spent grain total solids. Granular biomass after adaptation exhibited stabile operation at C-N ratios as low as 0.2 – 0.3, which is rare in anaerobic digestion. P-cresol as a degradation product was present in concentrations up to 45 mg/L and during the process successfully degraded. The excellent adaptability of the granular biomass is confirmed by 67% shift in bacterial and a 32% shift in archaeal community structure in granular biomass reactor after 198 days of successful operation.
Ključne besede: Anaerobic digestion, biogas production, brewery spent grain, microbial biomass, p-cresol degradation, solid state anaerobic digestion
Objavljeno v RUNG: 21.10.2016; Ogledov: 7738; Prenosov: 0
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