Production of ethanol from wheat straw by pretreatment and fermentation at high dry matter concentrations
article
High concentrations of substrate and product are important for the economy of second-generation bioethanol production. By a dilute acid thermal pretreatment of large pieces of relatively dry wheat straw using a novel rapid heating method, followed by fed-batch preliquefaction with hydrolytic enzymes, a subsequent simultaneous saccharification and fermentation with hydrolytic enzymes and Saccharomyces cerevisiae could be carried at a concentration of 38% (w/w) wheat straw dry matter. One part was preliquefied at 30% dry matter. In this way, 51 g ethanol L-1 was produced. More accessible cellulose was still available for production of yet more ethanol, but the ethanol production was limited by the reversible inactivation of the enzymes and irreversible inactivation of the yeast by high concentrations of toxic compounds in the straw hydrolysate. The production method developed yielded low amounts of by-products, such as furfural, 5-hydroxymethyl furfural, levulinic acid, and lactic acid. © Copyright 2011, Mary Ann Liebert, Inc.
Topics
TNO Identifier
429749
ISSN
15509087
Source
Industrial Biotechnology, 7(2), pp. 136-142.
Pages
136-142
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