원문정보
초록
영어
Bio-ethanol is one of the alternatives for fossil fuel and its production is increasing in many countries. Stillage is the by-product from the distillation of ethanol following fermentation of carbohydrates. The amount of stillage can be up to 20 liters for each liter of ethanol produced and it contains high amount of organic matters, causing serious environmental problems. Therefore, a proper treatment of stillage is necessary. We are now examining whether stillage can be used as a feedstock for the production of bio-butanol, another alternative bio-fuel. As the first step, the effect of possible inhibitors contained in stillage, that is, lactic acid, acetic acid, and ethanol, on the butanol fermentation was investigated. Clostridium pasteurianum DSM
525 could produce 0.29~0.42 mole of butanol from 1 mole of glycerol in the presence of up to 9 g/L of lactic acid, 10 g/L of acetic acid, and 10 g/L of ethanol without serious inhibition of growth.