Techno-economic evaluation of conditioning with sodium sulfite for bioethanol production from softwood
2015 (English)In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 196, 129-135 p.Article in journal (Refereed) Published
Conditioning with reducing agents allows alleviation of inhibition of biocatalytic processes by toxic by-products generated during biomass pretreatment, without necessitating the introduction of a separate process step. In this work, conditioning of steam-pretreated spruce with sodium sulfite made it possible to lower the yeast and enzyme dosages in simultaneous saccharification and fermentation (SSF) to 1 g/L and 5 FPU/g WIS, respectively. Techno-economic evaluation indicates that the cost of sodium sulfite can be offset by benefits resulting from a reduction of either the yeast load by 0.68 g/L or the enzyme load by 1 FPU/g WIS. As those thresholds were surpassed, inclusion of conditioning can be justified. Another potential benefit results from shortening the SSF time, which would allow reducing the bioreactor volume and result in capital savings. Sodium sulfite conditioning emerges as an opportunity to lower the financial uncertainty and compensate the overall investment risk for commercializing a softwood-to-ethanol process. (C) 2015 The Authors. Published by Elsevier Ltd.
Place, publisher, year, edition, pages
2015. Vol. 196, 129-135 p.
Cellulosic ethanol, Conditioning, Sodium sulfite, Simultaneous saccharification and fermentation, chno-economic evaluation
Biochemistry and Molecular Biology
IdentifiersURN: urn:nbn:se:umu:diva-109788DOI: 10.1016/j.biortech.2015.07.051ISI: 000361040500018PubMedID: 26232771OAI: oai:DiVA.org:umu-109788DiVA: diva2:859734