. Major by-products of bioethanol production are carbon dioxide and stillage. The carbon dioxide released during the fermentation is being collected, purified and processed in the majority of contem- porary fermentation facilities. It is generally used in food industry for artificial gasification of wine and production of carbonated beverages, as well as a gas for metal processing industry [12]. An average stillage amount produced in the bioethanol process is approximately 13 hL per hL of bioethanol [53].