کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
677343 | 1459848 | 2012 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Alcohol production from sterilized and non-sterilized molasses by Saccharomyces cerevisiae immobilized on brewer's spent grains in two types of continuous bioreactor systems Alcohol production from sterilized and non-sterilized molasses by Saccharomyces cerevisiae immobilized on brewer's spent grains in two types of continuous bioreactor systems](/preview/png/677343.png)
In this work an integrated cost effective system for continuous alcoholic fermentation of a cheap raw material (molasses) is described, involving yeast immobilized by a simple method on brewer's spent grains, able to ferment in the temperature range 30–40 °C, and two types of bioreactors, a Multistage Fixed Bed Tower (MFBT) and a Packed Bed reactor (PB). The MFBT bioreactor gave better results regarding ethanol concentration, productivity and conversion. Furthermore, the use of sterilized and non-sterilized molasses, fed in two similar MFBT bioreactors, showed that ethanol concentration (kg m−3) was significantly (p < 0.05) affected by the sterilization process as well as temperature alteration. Higher ethanol concentrations were obtained in the case of non-sterilized molasses (47.4–50.6 kg m−3at 35 °C and 44.2–48.2 kg m−3 at 40 °C), compared to sterilized molasses, where ethanol concentration ranged from 35.6 to 46.6 kg m−3 at 35 °C and 30.8–44.2 kg m−3at 40 °C. During 32 days of continuous operation using non-sterilized molasses no contamination was observed. Industrialization of the proposed system seems to have a potential, mainly due to its high fermentation efficiency and the obtained high operational stability.
► An integrated cost effective system for continuous alcoholic fermentation.
► Efficient conversion of non-sterilized molasses to ethanol.
► No need for additional treatments to prevent contamination.
► Results showed high fermentation efficiency and high operational stability.
Journal: Biomass and Bioenergy - Volume 45, October 2012, Pages 87–94