prikaz prve stranice dokumenta Mathematical modeling and mass transfer research in development of sustainable bioprocesses for production of organic solvents and biofuels
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doctoral thesis
Mathematical modeling and mass transfer research in development of sustainable bioprocesses for production of organic solvents and biofuels
Zagreb: University of Zagreb, Faculty of Food Technology and Biotechnology, 2015. urn:nbn:hr:159:665997
Novak, Mario
University of Zagreb
Faculty of Food Technology and Biotechnology

Institutional repository: Repository of the Faculty of Food Technology and Biotechnology

Cite this document

Novak, M. (2015). Mathematical modeling and mass transfer research in development of sustainable bioprocesses for production of organic solvents and biofuels (Doctoral thesis). Zagreb: University of Zagreb, Faculty of Food Technology and Biotechnology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:159:665997

Novak, Mario. "Mathematical modeling and mass transfer research in development of sustainable bioprocesses for production of organic solvents and biofuels." Doctoral thesis, University of Zagreb, Faculty of Food Technology and Biotechnology, 2015. https://urn.nsk.hr/urn:nbn:hr:159:665997

Novak, Mario. "Mathematical modeling and mass transfer research in development of sustainable bioprocesses for production of organic solvents and biofuels." Doctoral thesis, University of Zagreb, Faculty of Food Technology and Biotechnology, 2015. https://urn.nsk.hr/urn:nbn:hr:159:665997

Novak, M. (2015). 'Mathematical modeling and mass transfer research in development of sustainable bioprocesses for production of organic solvents and biofuels', Doctoral thesis, University of Zagreb, Faculty of Food Technology and Biotechnology, accessed 13 January 2025, https://urn.nsk.hr/urn:nbn:hr:159:665997

Novak M. Mathematical modeling and mass transfer research in development of sustainable bioprocesses for production of organic solvents and biofuels [Doctoral thesis]. Zagreb: University of Zagreb, Faculty of Food Technology and Biotechnology; 2015 [cited 2025 January 13] Available at: https://urn.nsk.hr/urn:nbn:hr:159:665997

M. Novak, "Mathematical modeling and mass transfer research in development of sustainable bioprocesses for production of organic solvents and biofuels", Doctoral thesis, University of Zagreb, Faculty of Food Technology and Biotechnology, Zagreb, 2015. Available at: https://urn.nsk.hr/urn:nbn:hr:159:665997

Metadata
TitleMathematical modeling and mass transfer research in development of sustainable bioprocesses for production of organic solvents and biofuels
Title (croatian)Matematičko modeliranje i istraživanje prijenosa mase u razvoju održivih biotehnoloških procesa proizvodnje organskih otapala i biogoriva
AuthorMario Novak
MentorPredrag Horvat (mentor)
Committee memberBožidar Šantek (predsjednik povjerenstva)
GranterUniversity of Zagreb
Faculty of Food Technology and Biotechnology
Zagreb
Defense date and country2015-07-10, Croatia
Scientific / art field,
discipline and subdiscipline		BIOTECHNICAL SCIENCES
Biotechnology
Universal decimal classification
(UDC)		664 - Production and preservation of solid foodstuffs
Abstract
The aim of this work was to explore the possibility for development of the new, low-energy demanding process for bioethanol production directly from sugar beet cossettes. For that purpose a two-stage bioreactor system was assembled where the first stage was the vertical packed-bed column in order to use the vertical column in the first stage as an extracting column filled with the packed-bed of sugar beet cossettes that were extracted with concentrated suspension of baker’s yeast thus performing simultaneous extraction and fermentation. The second stage in a bioreactor system was a stirred tank bioreactor. The extraction of sugars was studied in 0,5 and 1,0 [m] column at extractant temperature of 20, 28, 36 and 72°C, respectively, by using two different residence times 24 and 49 [min]. Non-structured mathematical models of sugar extraction process were developed using linear, nonlinear and surface response regression methods as well as by the use of ternary plots. Also, the structured compartment type mathematical model for the sugar extraction from the sugar beet cossettes was established and explored in detail. The commercial baker’s yeast was the working microorganism in the simultaneous process of extraction and fermentation of sugar beet cossettes, thus it was subjected to the thorough fermentation kinetic analysis. Based on achieved results an own formal kinetic mathematical model for microbial conversion of sugars to ethanol (containing substrate and product inhibition terms) was developed and interconnected with the structured mathematical model of extraction (convection/diffusion mass transfer). This combined mathematical model was applied for the modelling of simultaneous extraction and fermentation of sugar beet cossettes in the two step bioreactor system. The model described correctly the new bioprocess and was able to predict values of parameters that have not been able to determine experimentally in those heterogeneous systems. It was proven that the model could be additionaly improved by the use of the computational fluid dynamics calculations.
Abstract (croatian)
Cilj ovog rada bio je razvoj novog, energetski nisko zahtjevnog procesa proizvodnje bioetanola izravno iz rezanaca šećerne repe. U tu svrhu konstruiran je dvo-stupanjski bioreaktorski sustav (sastavljen od vertikalne kolone s nasutim slojem rezanaca šećerne repe koji je podvrgnut ekstrakciji s gustom suspenzijom pekarskog kvasca s kojom je provedena simultana ekstrakcija fermentacija. Drugi stupanj u bioreaktorskom sustavu bio je bioreaktor s miješalicom. Ekstrakcija šećera istraživana je u 0,5 i 1,0 [m] dugom vertikalnom cijevnom bioreaktoru na temperaturama od 20, 28, 36 i 72°C i kod dva vremena zadržavanja 24 te 49 minuta. Nestrukturirani matematički modeli ekstrakcije šećera su razvijeni korištenjem linearne i nelinearne regresije, metodom površinske regresije te korištenjem ternarnih dijagrama. Također je uspostavljen strukturirani kaskadni matematički model za ekstrakciju šećera iz rezanaca šećerne repe koji je detaljno istražen. Pekarski kvasac je korišten kao radni mikroorganizam u postupku simultane ekstrakcije i fermentacije te je stoga podvrgnut pažljivoj analizi kinetike fermentacije. Na temelju postignutih rezultata razvijen je vlastiti formalno kinetički matematički model za mikrobnuS konverziju šećera u etanol (koji sadrži članove za inhibiciju supstratom i produktom) koji je zatim povezan je sa strukturnim modelom ekstrakcije (konvektivni prijenos mase i molekulske difuzija). Ovaj složeni matematički model i primijenjen za modeliranje procesa simultane ekstrakcije i fermentacije rezanaca šećerne repe u bioreaktorskom sustavu od dva stupnja. Model je dobro opisivao novi bioproces te je mogao predviđati vrijednosti parametara koje nije bilo moguće eksperimentalno utvrditi u takovim heterogenim sustavima. Dokazano je da se model može dodatno unaprijediti s pomoću računalne dinamike fluida.
Keywords
Keywords (english)
Languageenglish
URN:NBNurn:nbn:hr:159:665997
Promotion2016-04-17
Study programmeTitle: Postgraduate PhD Study in Biotechnology and Bioprocess Engineering
Study programme type: university
Study level: postgraduate
Academic / professional title: doktor/doktorica znanosti (doktor/doktorica znanosti)
Type of resourceText
File originBorn digital
Access conditionsAccess restricted to students and staff of home institution
Terms of useLicence In copyright icon
Created on2018-05-18 08:41:52