title: Ethanol production from whey permeate in a continuous anaerobic bioreactor by Kluyveromyces marxianus.
abstract: The possibility of using whey permeate as a raw material for the production of ethanol by continuous fermentation by using Kluyveromyces marxianus was examined. The ethanol formation was investigated as a function of the hydraulic retention time in a UASB reactor. The initial lactose concentration in permeate was 50.0 g L(-1). The hydraulic retention time supplied were 12, 24, 48 h and the daily ethanol formations were 4.46, 8.61, 7.73 g L(-1), respectively. The yield coefficient of ethanol was 0.089 g ethanol g(-1) lactose when the hydraulic retention time was 12 h and raised to 0.325 g g(-1) when the hydraulic retention time was as long as 48 h. The results indicated that in ethanol fermentation the hydraulic retention time should be 24 h to obtain high rates of ethanol formation and to avoid product inhibition.
authors.affiliation: Department of Environmental Protection Engineering, University of Warmia and Mazury in Olsztyn, Poland. jedrzejewska@uwm.edu.pl
authors.forename: M
authors.initials: M
authors.lastname: Jedrzejewska
authors.forename: K
authors.initials: K
authors.lastname: Kozak
mesh_terms: D000693:Anaerobiosis; D000818:Animals; D019149:Bioreactors / Q000382:microbiology*; D000431:Ethanol / Q000378:metabolism*; D005285:Fermentation; D019649:Food Industry; D006863:Hydrogen-Ion Concentration; D007716:Kluyveromyces / Q000378:metabolism*; D007785:Lactose / Q000378:metabolism; D008892:Milk / Q000378:metabolism*; D008894:Milk Proteins; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods*; D000067816:Whey Proteins
chemical_list: D008894:Milk Proteins; D000067816:Whey Proteins; D000431:Ethanol; D007785:Lactose