Main content area

Ethanol production from lactose in a fermentation/pervaporation system

Lewandowska, M., Kujawski, W.
Journal of food engineering 2007 v.79 no.2 pp. 430-437
dairy industry, food processing wastes, waste utilization, milk, permeates, lactose, mash, alcoholic fermentation, starter cultures, Saccharomyces cerevisiae, immobilized cells, continuous fermentation, food microbiology, ethanol production, evaporation, biofuels, ethanol
Studies were carried out to improve the effectiveness and cost-effectiveness of a semi-continuous ethanol fermentation of lactose mash combined with a pervaporation module. During a 20-day fermentation/pervaporation with an immobilized biocatalyst, the fermentation of the lactose mash (12%) averaged 4.56% m/v EtOH. In the circulation pervaporation module, ethanol from about 2000 g portions of the fermented mash was removed to below 0.7% m/v in 10-12 h. The effectiveness of ethanol separation (Dr) ranged between 88 and 95% and was determined by the ethanol concentration in the fermented mash. The productivity of 15.6% m/v ethanol obtained in such a system was about 530 g/day. The PDMS-PAN-PV membrane applied in the pervaporation system proved to be highly selective towards ethanol (α > 8) and exhibited very advantageous permeation properties (J = 2600-3500 g/m2 x h).