The usage of cheap, waste raw
material like bread leftovers in the cost-effective process of direct
starch hydrolysis and fermentation could be very attractive for ethanol
fuel production. Until now the usage of GSHE for the waste
bread processing into ethanol was not studied. This could be very
effective solution including high ethanol yield and vast reduction
of processing costs in comparison to traditional processes.
The object of this study was to asses the ethanol fermentation
course and efficiency of waste bread using granular starch hydrolyzing
enzyme in comparison to separate hydrolysis and fermentation
process. Also different methods of raw material pretreatment
(enzymatic, ultrasonic and microwave) was conducted to improve
raw starch hydrolysis and fermentation.