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Ethanol production from whey in a bioreactor coupled with direct contact membrane distillation.pdf
Catalysis Today 268 (2016) 156–163
Contents lists available at ScienceDirect
Catalysis Today
journal homepage: /locate/cattod
Ethanol production from whey in a bioreactor coupled with direct contact membrane distillation
Maria Tomaszewska ?, Lidia Bia?on′ czyk
West Pomeranian University of Technology, Szczecin, Institute of Chemical and Environment Engineering, ul. Pu?askiego 10, 70-322 Szczecin, Poland
article info
Article history: Received 18 September 2015 Received in revised form 26 January 2016 Accepted 27 January 2016 Available online 12 February 2016
Keywords: Membrane bioreactor MDBR Conversion of whey into ethanol Ethanol separation Direct contact Membrane distillation
abstract
The ethanol production from whey in a bioreactor integrated with direct contact membrane distillation (MDBR) was investigated. Fermentation was studied using concentrated whey and deproteinized whey enriched with lactose or sucrose. Whey lactose was prehydrolyzed in an enzymatic process using ?galactosidase into a mixture of glucose and galactose. The fermentation process was performed using Saccharomyces cerevisiae yeasts species.
It was found that MDBR can be successfully applied for ethanol production from whey. A continuous removal of produced ethanol and other volatile compounds from a fermenting broth by membrane distillation resulted in a high ef?ciency of sugar conversion into ethanol. The ef?ciency of ethanol production in MDBR in the fermentation of deproteinized whey enriched with sucrose was close to the theoretical value and 1.9× higher than that in the process carried out in a bioreactor without MD. It was found that salt present in the concentrated whey decreased the process ef?ciency.
? 2016 Elsevier B.V. All rights reserved.
1. Introduction
Cheese whey represents a serious environmental problem due to high volumes produced and a high organic matter content (biological oxygen demand, BOD of 30–50 g dm?3 and chemical oxygen demand (COD) of 60–80 g dm?3) [1]. Lactose pr
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