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Integration of CO2 capture and microalgae cultivation: demonstration assessment of outdoor Scenedesmus acutus cultivation using gaseous ammonia as a nitrogen source

Journal Article · · Journal of Chemical Technology and Biotechnology
DOI:https://doi.org/10.1002/jctb.7824· OSTI ID:2523638
Towards the goal of integrating CO2 capture using aqueous ammonia with its utilization for algae cultivation, Scenedesmus acutus (UTEX B72) was grown in 1100 L open raceway ponds using CO2 and NH3 supplied from gas cylinders. CO2/NH3 mole ratios of 7 and 10 were employed, the gas mixture acting as a surrogate for the output from a CO2 scrubbing system using aqueous ammonia. Compared to Scenedesmus acutus grown in open ponds using gaseous CO2 and NaNO3 as the N-source, the ponds supplied with gaseous CO2 and NH3 displayed higher productivity at both CO2/NH3 ratios, with the higher ratio providing the best growth. Depending on the culturing conditions and CO2/NH3 ratio, CO2 utilization ranged up to 15.8% and NH3 utilization to 23.0%. These rather low values reflect the fact the high CO2/NH3 feed rate used, resulting in a substantial release of NH3 from the ORPs (~45%). Finally, these findings demonstrate the suitability of gaseous NH3 as a N-source for microalgae cultivation, while highlighting the need for a control strategy that closely balances the CO2/NH3 supply with the algae growth rate. The produced algae biomass possessed a high protein and low ash content, rendering it particularly suitable for use as a bioplastic feedstock.
Research Organization:
University of Kentucky, Lexington, KY (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy and Carbon Management (FECM), Office of Carbon Management
Grant/Contract Number:
FE0031921
OSTI ID:
2523638
Alternate ID(s):
OSTI ID: 2514495
Report Number(s):
DOE-UKY--31921-2
Journal Information:
Journal of Chemical Technology and Biotechnology, Journal Name: Journal of Chemical Technology and Biotechnology Journal Issue: 4 Vol. 100; ISSN 0268-2575
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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