The potential of the waste from beer fermentation broth (WBFB) for the production of bio-ethanol using
a simultaneous saccharification and fermentation process without any extra additions of saccharification
enzymes, microbial cells or carbohydrate was tested. The major microbial cells in WBFB were isolated and
identified. The variations in compositions of WBFB with stock time were investigated. There was residual
activity of starch hydrolyzing enzymes in WBFB. The effects of reaction modes e.g. static and shaking on
bio-ethanol production were studied. After 7 days of cultivation using the supernatant of WBFB at 30 ◦C
the ethanol concentration reached 103.8 g/L in shaking culture and 91.5 g/L in static culture. Agitation
experiments conducted at a temperature-profile process in which temperature was increased from 25 to
67 ◦C shortened the simultaneous process time. The original WBFB was more useful than the supernatant
of WBFB in getting the higher concentration of ethanol and reducing the fermentation time. From this
whole study it was found that WBFB is a cheap and suitable source for bio-ethanol production.