Investigations of the possibilities of stillage utilization from the bioethanol production on corn
Mojović, Lj., Faculty of Technology and Metallurgy, Belgrade (Serbia) | Pejin, D., Faculty of Technology, Novi Sad (Serbia) | Rakin, M., Faculty of Technology and Metallurgy, Belgrade (Serbia) | Vukašinović, M., Faculty of Technology and Metallurgy, Belgrade (Serbia) | Pejin, J., Faculty of Technology, Novi Sad (Serbia) | Grujić, O., Faculty of Technology, Novi Sad (Serbia) | Nikolić, S., Faculty of Technology and Metallurgy, Belgrade (Serbia) | Radosavljević, M., Maize Research Institute Zemun Polje, Belgrade - Zemun (Serbia)
Bioethanol produced by fermentation of biomass, such as sugar, starch, or lignocellulosic materials, is one of the most important renewable energy resources. An average thin stillage amount produced in the bioethanol process is approximately 13 hL per hL of bioethanol. An adequate utilization of the stillage is of great importance in order to improve the economy of the bioethanol production. The aim of this paper was to study the possibilities of stillage utilization from the process of bioethanol production from corn. For this purpose the recirculation of thin stillage in the amount of 10-30% in mashing process was studied, while the solid phase remained after filtration was assessed for animal feed. The results have shown that the ethanol yield in the process can be significantly increased by the recirculation. The dry matter content in the slurry after the fermentation also increased with the increasing amount of recirculated stillage. Chemical composition of solid stillage remained after fermentation as well as of the solid stillage enriched with yeast (1% of dry Saccharomyces cerevisiae yeast) was studied. The stillage enriched with yeast had a greater amount of proteins and generally can be used as a high quality feed.
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