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Title: Combined algal processing: A novel integrated biorefinery process to produce algal biofuels and bioproducts

Abstract

Here, the development of an integrated biorefinery process capable of producing multiple products is crucial for commercialization of microalgal biofuel production. Dilute acid pretreatment has been demonstrated as an efficient approach to utilize algal biomass more fully, by hydrolyzing microalgal carbohydrates into fermentable sugars, while making the lipids more extractable, and a protein fraction available for other products. Previously, we have shown that sugar-rich liquor could be separated from solid residue by solid-liquid separation (SLS) to produce ethanol via fermentation. However, process modeling has revealed that approximately 37% of the soluble sugars were lost in the solid cake after the SLS. Herein, a Combined Algal Processing (CAP) approach with a simplified configuration has been developed to improve the total energy yield. In CAP, whole algal slurry after acid pretreatment is directly used for ethanol fermentation. The ethanol and microalgal lipids can be sequentially recovered from the fermentation broth by thermal treatment and solvent extraction. Almost all the monomeric fermentable sugars can be utilized for ethanol production without compromising the lipid recovery. The techno-economic analysis (TEA) indicates that the CAP can reduce microalgal biofuel cost by $0.95 per gallon gasoline equivalent (GGE), which is a 9% reduction compared to the previousmore » biorefinery scenario.« less

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Bioenergy Technologies Office
OSTI Identifier:
1234982
Alternate Identifier(s):
OSTI ID: 1330940
Report Number(s):
NREL/JA-5100-64979
Journal ID: ISSN 2211-9264; S2211926415301351; PII: S2211926415301351
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article: Published Article
Journal Name:
Algal Research
Additional Journal Information:
Journal Name: Algal Research Journal Volume: 19 Journal Issue: C; Journal ID: ISSN 2211-9264
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANAYLYTICAL CHEMISTRY; algal biofuels; CAP process; ethanol; fermentation; technoeconomic analysis; biorefinery; microalgal biofuel; pretreatment; extraction

Citation Formats

Dong, Tao, Knoshaug, Eric P., Davis, Ryan, Laurens, Lieve M. L., Van Wychen, Stefanie, Pienkos, Philip T., and Nagle, Nick. Combined algal processing: A novel integrated biorefinery process to produce algal biofuels and bioproducts. United States: N. p., 2016. Web. doi:10.1016/j.algal.2015.12.021.
Dong, Tao, Knoshaug, Eric P., Davis, Ryan, Laurens, Lieve M. L., Van Wychen, Stefanie, Pienkos, Philip T., & Nagle, Nick. Combined algal processing: A novel integrated biorefinery process to produce algal biofuels and bioproducts. United States. https://doi.org/10.1016/j.algal.2015.12.021
Dong, Tao, Knoshaug, Eric P., Davis, Ryan, Laurens, Lieve M. L., Van Wychen, Stefanie, Pienkos, Philip T., and Nagle, Nick. 2016. "Combined algal processing: A novel integrated biorefinery process to produce algal biofuels and bioproducts". United States. https://doi.org/10.1016/j.algal.2015.12.021.
@article{osti_1234982,
title = {Combined algal processing: A novel integrated biorefinery process to produce algal biofuels and bioproducts},
author = {Dong, Tao and Knoshaug, Eric P. and Davis, Ryan and Laurens, Lieve M. L. and Van Wychen, Stefanie and Pienkos, Philip T. and Nagle, Nick},
abstractNote = {Here, the development of an integrated biorefinery process capable of producing multiple products is crucial for commercialization of microalgal biofuel production. Dilute acid pretreatment has been demonstrated as an efficient approach to utilize algal biomass more fully, by hydrolyzing microalgal carbohydrates into fermentable sugars, while making the lipids more extractable, and a protein fraction available for other products. Previously, we have shown that sugar-rich liquor could be separated from solid residue by solid-liquid separation (SLS) to produce ethanol via fermentation. However, process modeling has revealed that approximately 37% of the soluble sugars were lost in the solid cake after the SLS. Herein, a Combined Algal Processing (CAP) approach with a simplified configuration has been developed to improve the total energy yield. In CAP, whole algal slurry after acid pretreatment is directly used for ethanol fermentation. The ethanol and microalgal lipids can be sequentially recovered from the fermentation broth by thermal treatment and solvent extraction. Almost all the monomeric fermentable sugars can be utilized for ethanol production without compromising the lipid recovery. The techno-economic analysis (TEA) indicates that the CAP can reduce microalgal biofuel cost by $0.95 per gallon gasoline equivalent (GGE), which is a 9% reduction compared to the previous biorefinery scenario.},
doi = {10.1016/j.algal.2015.12.021},
url = {https://www.osti.gov/biblio/1234982}, journal = {Algal Research},
issn = {2211-9264},
number = C,
volume = 19,
place = {United States},
year = {2016},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at https://doi.org/10.1016/j.algal.2015.12.021

Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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