Techno-economic evaluation of conditioning with sodium sulfite for bioethanol production from softwood.

Bioresour Technol 2015 Nov 21;196:129-35. Epub 2015 Jul 21.

Department of Chemistry, Umeå University, SE-901 87 Umeå, Sweden.

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 1g/L and 5FPU/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 0.68g/L or the enzyme load by 1FPU/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.

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.biortech.2015.07.051DOI Listing
November 2015
134 Reads

Publication Analysis

Top Keywords

sodium sulfite
16
techno-economic evaluation
8
conditioning
5
conditioning justified
4
lower yeast
4
sulfite lower
4
yeast enzyme
4
justified potential
4
inclusion conditioning
4
dosages simultaneous
4
surpassed inclusion
4
enzyme dosages
4
potential benefit
4
benefit shortening
4
step work
4
ssf time
4
process step
4
time allow
4
work conditioning
4
shortening ssf
4

Similar Publications