Glycerol accumulation while recycling thin stillage in corn fermentations to ethanol

Abstract

By succesive recycling of the thin stillage in mashing and fermenting fresh corn, the glycerol content in each fermentation increased by about 0.4% and accumulated to a high of 2.1% in the beer of the fifth recycle. Glycerol concentration declined after the fifth recycle. The original fermentation contained 0.8% glycerol. © 1990 Society for Industrial Microbiology.