Abstract
The distillery stillage is a major and arduous byproduct generated during ethanol production in distilleries. The liquid part of this stillage was proved that can be recycled in the ethanol production from corn, without disturbing the fermentation process. The corn seeds were fermented employing the conventional non-pressure method for gelatinizing as well as including a novelty: Recirculation system of distillery stillage liquid part instead of process water. The efficiency of fermentation and main chemical parameters of stillage were estimated. The liquid part of stillage was recycled 28 times. At these conditions distillery yeast Saccharomyces cerevisiae efficiently produced ethanol yielding 79.80% of the theoretical, keeping the vitality and quantity on the same level. However, recirculation of the liquid part of stillage caused protein and potassium increase in the wet cake what makes this product more attractive for fodder supplementation. It was proven that the addition of stillage liquid fraction to the mashing process instead of process water and 28 recirculation cycles in ethanol production from corn constitutes the way which could significantly reduce the water and energy consumption, what essentially reduce whole general production costs without ethanol efficiency decreasing.
Highlights
Bioethanol is the most promising biofuel and the starting material for various chemicals production
It was proven that the addition of stillage liquid fraction to the mashing process instead of process water and 28 recirculation cycles in ethanol production from corn constitutes the way which could significantly reduce the water and energy consumption, what essentially reduce whole general production costs without ethanol efficiency decreasing
The analysis showed the increase of acids quantity along with the Recirculation cycle number
Summary
Bioethanol is the most promising biofuel and the starting material for various chemicals production. Increase in the demand for ethanol as a fuel additive resulted in an increase in the amount of corn used for ethanol production. There are many technologies and materials applied for effective bioethanol production and stillage utilization (Mwithiga, 2013; Anwar et al, 2012; Marx et al, 2012; Shanavas et al 2011; Mojovic et al, 2010; Sun et al, 2010; Gibreel et al, 2009; Krzywonos et al, 2009a; Nicolic et al, 2009; Cibis et al, 2006a). Corn grain is very important cereal material containing starch. This cereal contains over 60% of starch and is easy to handle as a material for fermentation. Corn can be converted into ethanol by either wet or dry milling method
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