Development of an enzyme cocktail to bioconvert untapped starch in sweet sorghum processing by-products: Part II. Application and economic potential

Klasson, K. Thomas; Cole, Marsha R.; Pancio, Bretlyn T.; Heckemeyer, Matthew

doi:10.1016/j.indcrop.2021.114370

Development of an enzyme cocktail to bioconvert untapped starch in sweet sorghum processing by-products: Part II. Application and economic potential

Journal Article · Tue Dec 07 23:00:00 EST 2021 · Industrial Crops and Products

DOI:https://doi.org/10.1016/j.indcrop.2021.114370· OSTI ID:1981643

Klasson, K. Thomas ^[1]; Cole, Marsha R. ^[2]; Pancio, Bretlyn T. ^[3]; Heckemeyer, Matthew ^[4]

US Dept. of Agriculture (USDA), New Orleans, LA (United States). ARS-Southern Regional Research Center
Oak Ridge Institute for Science and Education (ORISE), Oak Ridge, TN (United States); Louisiana Tech Univ., Ruston, LA (United States)
Oak Ridge Institute for Science and Education (ORISE), Oak Ridge, TN (United States)
Sugarmill Distilling, LLC, Sikeston, MO (United States); Heckemeyer Biorefinery, Sikeston, MO (United States)

Demand for bioethanol and other biochemicals produced from agricultural crops has increased. Sweet sorghum has been identified as a promising bioenergy crop as it can produce starch, sugar, and fibrous biomass. During processing, starch accumulates in the juice sediments and clarification mud. And, while currently not recovered, it can be made accessible for fermentation by enzymatic hydrolysis. The enzymatic hydrolysis of starch in sweet sorghum processing streams was investigated, followed by fermentation of the resulting glucose to ethanol. The juice sediment contained sufficient starch to increase fermentable sugars by 127%, allowing a final ethanol titer of 11.1 vol%. The economics for fermentation of only dissolved sugars (Scenario 1) versus dissolved sugars and hydrolyzed starch (Scenario 2) were compared using a technoeconomic model. Fixed capital cost was found to be similar for both scenarios. For a set harvest period, Scenario 2 could produce 20% more ethanol; however, if the distillation by-product was dried and marketed as animal feed, Scenario 1 was more cost effective. A plant producing 5.6–5.7 Mkg of fuel ethanol per year had a minimum selling price of $0.67/kg of ethanol with concurrent production of animal feed and zero cost sweet sorghum processing. Finally, even with these optimistic assumptions, the estimated production cost was higher than the current wholesale price of fuel ethanol.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge Institute for Science and Education (ORISE), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0014664

OSTI ID:: 1981643

Alternate ID(s):: OSTI ID: 1868778

Journal Information:: Industrial Crops and Products, Journal Name: Industrial Crops and Products Journal Issue: C Vol. 176; ISSN 0926-6690

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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