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Title: Demonstration and Evaluation of Hybrid Microalgae Aqueous Conversion Systems for Biofuel Production

Abstract

As an effort to develop affordable and sustainable energy sources, algae-derived biofuels have attracted considerable interest. As use of individual conversion processes targeting a subset of biochemical components (e.g., extraction and upgrading of lipids) has been shown to be economically unfeasible, there is a recognized need for integrated conversion systems that can valorize algal feedstocks with varying cell compositions. In this study, two hybrid systems (HBD-1, HBD-2) are proposed to enable more efficient conversion of all biomass components (lipids, proteins, carbohydrates) by leveraging two complementary systems: direct hydrothermal liquefaction (DHTL) and combined algal processing (CAP). Demonstrative experiments with Scenedesmus acutus show a 12.2-34.3% increase in fuel yields relative to individual systems (DHTL, CAP). Subsequent modeling efforts reveal substantial improvements stemming from CAP valorization of carbohydrates and lipids and DHTL valorization of proteins and CAP residuals. The maximum biomass-to-fuel conversion efficiencies for lipids/proteins/carbohydrate cell components are 79%/34%/75% (HBD-2), and techno-economic analysis suggests a 3.2-62.1% reduction in minimum fuel selling prices (MFSPs). The increased fuel yields and reduced MFSPs highlight the flexibility of the hybrid systems for biofuel production, revealing advantages of these systems for broader ranges of feedstocks, including ones not traditionally considered for fuel production.

Authors:
 [1];  [2];  [3];  [3];  [3];  [3];  [3];  [4];  [5]
  1. Colorado School of Mines, Golden, CO (United States)
  2. Colorado School of Mines, Golden, CO (United States); Univ. of Illinois, Urbana-Champaign, IL (United States)
  3. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  4. Univ. of Illinois, Urbana-Champaign, IL (United States)
  5. National Bioenergy Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States
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:
1503158
Report Number(s):
NREL/JA-5100-73535
Journal ID: ISSN 2168-0485
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
ACS Sustainable Chemistry & Engineering
Additional Journal Information:
Journal Volume: 7; Journal Issue: 6; Journal ID: ISSN 2168-0485
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; algal biofuel; combined algal processing (CAP); hydrothermal liquefaction (HTL); minimum fuel selling price (MFSP); techno-economic analysis (TEA); valorization

Citation Formats

Li, Yalin, Leow, Shijie, Dong, Tao, Nagle, Nicholas J., Knoshaug, Eric P., Laurens, Lieve M. L., Pienkos, Philip T., Guest, Jeremy S., and Strathmann, Timothy J. Demonstration and Evaluation of Hybrid Microalgae Aqueous Conversion Systems for Biofuel Production. United States: N. p., 2019. Web. doi:10.1021/acssuschemeng.8b05741.
Li, Yalin, Leow, Shijie, Dong, Tao, Nagle, Nicholas J., Knoshaug, Eric P., Laurens, Lieve M. L., Pienkos, Philip T., Guest, Jeremy S., & Strathmann, Timothy J. Demonstration and Evaluation of Hybrid Microalgae Aqueous Conversion Systems for Biofuel Production. United States. https://doi.org/10.1021/acssuschemeng.8b05741
Li, Yalin, Leow, Shijie, Dong, Tao, Nagle, Nicholas J., Knoshaug, Eric P., Laurens, Lieve M. L., Pienkos, Philip T., Guest, Jeremy S., and Strathmann, Timothy J. 2019. "Demonstration and Evaluation of Hybrid Microalgae Aqueous Conversion Systems for Biofuel Production". United States. https://doi.org/10.1021/acssuschemeng.8b05741. https://www.osti.gov/servlets/purl/1503158.
@article{osti_1503158,
title = {Demonstration and Evaluation of Hybrid Microalgae Aqueous Conversion Systems for Biofuel Production},
author = {Li, Yalin and Leow, Shijie and Dong, Tao and Nagle, Nicholas J. and Knoshaug, Eric P. and Laurens, Lieve M. L. and Pienkos, Philip T. and Guest, Jeremy S. and Strathmann, Timothy J.},
abstractNote = {As an effort to develop affordable and sustainable energy sources, algae-derived biofuels have attracted considerable interest. As use of individual conversion processes targeting a subset of biochemical components (e.g., extraction and upgrading of lipids) has been shown to be economically unfeasible, there is a recognized need for integrated conversion systems that can valorize algal feedstocks with varying cell compositions. In this study, two hybrid systems (HBD-1, HBD-2) are proposed to enable more efficient conversion of all biomass components (lipids, proteins, carbohydrates) by leveraging two complementary systems: direct hydrothermal liquefaction (DHTL) and combined algal processing (CAP). Demonstrative experiments with Scenedesmus acutus show a 12.2-34.3% increase in fuel yields relative to individual systems (DHTL, CAP). Subsequent modeling efforts reveal substantial improvements stemming from CAP valorization of carbohydrates and lipids and DHTL valorization of proteins and CAP residuals. The maximum biomass-to-fuel conversion efficiencies for lipids/proteins/carbohydrate cell components are 79%/34%/75% (HBD-2), and techno-economic analysis suggests a 3.2-62.1% reduction in minimum fuel selling prices (MFSPs). The increased fuel yields and reduced MFSPs highlight the flexibility of the hybrid systems for biofuel production, revealing advantages of these systems for broader ranges of feedstocks, including ones not traditionally considered for fuel production.},
doi = {10.1021/acssuschemeng.8b05741},
url = {https://www.osti.gov/biblio/1503158}, journal = {ACS Sustainable Chemistry & Engineering},
issn = {2168-0485},
number = 6,
volume = 7,
place = {United States},
year = {2019},
month = {2}
}

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Works referenced in this record:

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Works referencing / citing this record:

Seasonal treatment and economic evaluation of an algal wastewater system for energy and nutrient recovery
journal, January 2019