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
- University of Kentucky, Lexington, KY (United States)
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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