Different cultivation techniques foe ethanol production from raw sugar beet juice and development of their mathematical model

U ovom istraživanju proučavana je proizvodnja etanola pomoću kvasca Saccharomyces cerevisiae na svježem soku šećerne repe. Za vođenje procesa proizvodnje etanola primijenjene su ove tehnike: šaržni proces, šaržni proces s pritokom supstrata i polukontinuirani proces. Proces proizvodnje etanola opisan je formalno kinetičkim modelima, a za izradu modela korišten je program Berkeley Madonna. Međusobna usporedba različitih tehnika proizvodnje etanola na osnovi pokazatelja uspješnosti bioprocesa pokazala je da šaržni proces s pritokom supstrata ima najveću učinkovitost uz najveći stupanj konverzije supstrata u produkt, a polukontinuirani najveću produktivnost bioprocesa. Nadalje, međusobna usporedba različitih kinetičkih modela pokazuje da Aiba model najbolje opisuje šaržni proces proizvodnje etanola, Monod model šaržni proces s pritokom supstrata te Levenspiel model polukontinuirani proces proizvodnje etanola.In this investigation, the production of ethanol on the raw sugar beet juice by Saccharomyces cerevisiae was studied. For ethanol production following cultivation techniques were used: batch, fed batch and repeated batch. Ethanol production was described by formal kinetic models that were established by software Berkeley Madonna. Comparison between different cultivation techniques on the basis of efficiency pointed out that fed batch process has the highest efficiency and conversion coefficient and repeated batch process the highest productivity, respectively. Furthermore, comparison between different kinetic models shows that Aiba model was the most successful for description of batch process, Monod model for description of fed batch process and Levenspiel model for description of repeated batch process for ethanol production, respectively