Solid-state ethanol fermentation by means of inert gas circulation

✍ Scribed by K. Sato; K. Nakamura; S. Sato

• Publisher: John Wiley and Sons
• Year: 1985
• Tongue: English
• Weight: 733 KB
• Volume: 27
• Category: Article
• ISSN: 0006-3592
• DOI: 10.1002/bit.260270907

✦ Synopsis

A new method for solid-state ethanol fermentation (the SSEF system) was experimented on for the ethanol production from solid starchy materials, where a packedbed-type fermentor was used. Both cultivation of As- pergillus saitoi and enrichment of a saccharifying enzyme were effective for hydrolysis of the starch. Ethanol production was set in by a form of parallel fermentation using a respiration-deficient mutant of Sacchararnyces cerevisiae. Produced ethanol was simultaneously stripped by circulating inert gas and separated in a condenser. Average ethanol concentration in the condensate was over 200 g/L, and over 90% of produced ethanol was recovered from the packed bed during 15 or 16 days of stripping. The fermentation efficiency was about 80%' which was evaluated much higher than those of conventional solid-state fermentations. The residue had lesser volume and a higher solids content compared with the distillery wastewaters of conventional liquid-state fermentations. This means an advantage for the treatment and the effective conversion of the residue into fetilizers or animal feeds.