Bioethanol Production From Oilseed Rape Straw
Hydrolysate By Free And Immobilised Cells Of
Saccharomyces Cerevisiae
Author(s)
A. K. Mathew, K. Chaney, M. Crook & A. C. Humphries
Abstract
Oilseed rape (OSR) straw can serve as a low-cost feedstock for bioethanol
production. Glucose and other fermentable sugars were extracted from OSR
straw using sulfuric acid pre-treatment and enzymatic hydrolysis. Batch
fermentation of enzymatic hydrolysate with Saccharomyces cerevisiae
immobilised in Lentikat® was found to be superior to free cells in terms of
bioethanol yield. The maximum bioethanol concentration from free and
immobilised cells was 6.73 and 9.45 g.l-1, respectively, with corresponding
yields of 0.41and 0.49 g bioethanol. g glucose-1.
Keywords: bioethanol, dilute acid pre-treatment, immobilisation, oilseed rape
straw.
1 Introduction
In 2007, consumption of liquid fuels in the transportation sector was 46 million
barrels per day and is expected to increase by 67 million barrels per day by 2035
EIA [1]. In 2007, the use of liquid fuels was responsible for 38% of global
greenhouse gas (GHG) emissions, providing a significant contribution to climate
change EIA [1]. The replacement of gasoline (petrol) with bioethanol is
encouraged globally as a mechanism to reduce exposure to volatility in the oil
market, and minimise the extent to which road transport contributes to global
warming. Bioethanol can be produced from two different types of feedstocks:
first-generation feedstocks (maize, wheat and sugarcane) and second-generation
feedstocks (lignocellulosic materials such as straws, forest residue or any
agriculture waste) (Balat [2]). Commercial production of bioethanol from firstgeneration
feedstocks is limited by land availability, and concerns regarding the
Keywords
bioethanol, dilute acid pre-treatment, immobilisation, oilseed rape
straw.
Related Book
Other papers in this volume
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