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Title: Down-Selection and Outdoor Evaluation of Novel, Halotolerant Algal Strains for Winter Cultivation

Abstract

Algae offer promising feedstocks for the production of renewable fuel and chemical intermediates. However, poor outdoor winter cultivation capacity currently limits deployment potential. In this study, 300 distinct algal strains were screened in saline medium to determine their cultivation suitability during winter conditions in Mesa, Arizona. Three strains, from the genera Micractinium, Chlorella, and Scenedesmus, were chosen following laboratory evaluations and grown outdoors in 1000 L raceway ponds during the winter. Strains were down-selected based on doubling time, lipid and carbohydrate amount, final biomass accumulation capacity, cell size and phylogenetic diversity. Algal biomass productivity and compositional analysis for lipids and carbohydrates show successful outdoor deployment and cultivation under winter conditions for these strains. Outdoor harvest-yield biomass productivities ranged from 2.9 to 4.0 g/m2/day over an 18 days winter cultivation trial, with maximum productivities ranging from 4.0 to 6.5 g/m2/day, the highest productivities reported to date for algal winter strains grown in saline media in open raceway ponds. Peak fatty acid levels ranged from 9 to 26% percent of biomass, and peak carbohydrate levels ranged from 13 to 34% depending on the strain. Changes in the lipid and carbohydrate profile throughout outdoor growth are reported. This study demonstrates that algal strainmore » screening under simulated outdoor environmental conditions in the laboratory enables identification of strains with robust biomass productivity and biofuel precursor composition. The strains isolated here represent promising winter deployment candidates for seasonal algal biomass production when using crop rotation strategies.« 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)
OSTI Identifier:
1479582
Alternate Identifier(s):
OSTI ID: 1482320
Report Number(s):
NREL/JA-5100-72793
Journal ID: ISSN 1664-462X; 1513
Grant/Contract Number:  
Agreement No. 22000, WBS 1.3.2.103; AC36-08GO28308
Resource Type:
Published Article
Journal Name:
Frontiers in Plant Science
Additional Journal Information:
Journal Name: Frontiers in Plant Science Journal Volume: 9; Journal ID: ISSN 1664-462X
Publisher:
Frontiers Media SA
Country of Publication:
Switzerland
Language:
English
Subject:
09 BIOMASS FUELS; microalgae; algal biofuels; algae screening; algae composition; winter algae; outdoor winter cultivation

Citation Formats

Dahlin, Lukas R., Van Wychen, Stefanie, Gerken, Henri G., McGowen, John, Pienkos, Philip T., Posewitz, Matthew C., and Guarnieri, Michael T. Down-Selection and Outdoor Evaluation of Novel, Halotolerant Algal Strains for Winter Cultivation. Switzerland: N. p., 2018. Web. doi:10.3389/fpls.2018.01513.
Dahlin, Lukas R., Van Wychen, Stefanie, Gerken, Henri G., McGowen, John, Pienkos, Philip T., Posewitz, Matthew C., & Guarnieri, Michael T. Down-Selection and Outdoor Evaluation of Novel, Halotolerant Algal Strains for Winter Cultivation. Switzerland. doi:10.3389/fpls.2018.01513.
Dahlin, Lukas R., Van Wychen, Stefanie, Gerken, Henri G., McGowen, John, Pienkos, Philip T., Posewitz, Matthew C., and Guarnieri, Michael T. Mon . "Down-Selection and Outdoor Evaluation of Novel, Halotolerant Algal Strains for Winter Cultivation". Switzerland. doi:10.3389/fpls.2018.01513.
@article{osti_1479582,
title = {Down-Selection and Outdoor Evaluation of Novel, Halotolerant Algal Strains for Winter Cultivation},
author = {Dahlin, Lukas R. and Van Wychen, Stefanie and Gerken, Henri G. and McGowen, John and Pienkos, Philip T. and Posewitz, Matthew C. and Guarnieri, Michael T.},
abstractNote = {Algae offer promising feedstocks for the production of renewable fuel and chemical intermediates. However, poor outdoor winter cultivation capacity currently limits deployment potential. In this study, 300 distinct algal strains were screened in saline medium to determine their cultivation suitability during winter conditions in Mesa, Arizona. Three strains, from the genera Micractinium, Chlorella, and Scenedesmus, were chosen following laboratory evaluations and grown outdoors in 1000 L raceway ponds during the winter. Strains were down-selected based on doubling time, lipid and carbohydrate amount, final biomass accumulation capacity, cell size and phylogenetic diversity. Algal biomass productivity and compositional analysis for lipids and carbohydrates show successful outdoor deployment and cultivation under winter conditions for these strains. Outdoor harvest-yield biomass productivities ranged from 2.9 to 4.0 g/m2/day over an 18 days winter cultivation trial, with maximum productivities ranging from 4.0 to 6.5 g/m2/day, the highest productivities reported to date for algal winter strains grown in saline media in open raceway ponds. Peak fatty acid levels ranged from 9 to 26% percent of biomass, and peak carbohydrate levels ranged from 13 to 34% depending on the strain. Changes in the lipid and carbohydrate profile throughout outdoor growth are reported. This study demonstrates that algal strain screening under simulated outdoor environmental conditions in the laboratory enables identification of strains with robust biomass productivity and biofuel precursor composition. The strains isolated here represent promising winter deployment candidates for seasonal algal biomass production when using crop rotation strategies.},
doi = {10.3389/fpls.2018.01513},
journal = {Frontiers in Plant Science},
number = ,
volume = 9,
place = {Switzerland},
year = {2018},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.3389/fpls.2018.01513

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