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Title: A newly isolated alkaliphilic cyanobacterium for biomass production with direct air CO2 capture

Journal Article · · Journal of CO2 Utilization

Large-scale microalgal biomass production usually relies on concentrated CO2 as the carbon source which is a major logistical and economic challenge because of the required infrastructure and geospatial constraints of siting large algal production facilities close to concentrated CO2 sources. By taking advantage of enhanced CO2 mass transfer within alkaline media due to the reaction between CO2 and OH-, carbon can be directly captured from the ambient air and used by the algae. Achieving such goal requires algal strains that can grow fast under alkaline conditions. In this study, a newly isolated alkaliphilic cyanobacterial strain Cyanobacterium sp. PNNL-SSL1 was characterized for its temperature, pH, and salinity tolerance. The result shows that PNNL-SSL1 could sustain grow at pH above 11.2 but exhibited the highest growth rates at pH below 10.5. The strain is a warm season strain and grows the best at 10 PSU (practical salinity unit). The strain was then evaluated in indoor climate simulation ponds under outdoor-relevant pond cultivation conditions with carbon supplied only through direct air CO2 capture at the culture surface. Two batch culture runs, at slightly different initial pH, exhibited average biomass productivity of 15.2 g m-2 day-1 on ash-free dry weight basis. CO2 was directly captured from the air at an average rate of 21.6 g CO2 m-2 day-1 (78.8 tons ha-1 yr-1), contributing 74% of the carbon fixed in the biomass. The results demonstrated that PNNL-SSL1 is a promising strain for biomass production using air CO2 as the carbon source.

Research Organization:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Bioenergy Technologies Office
Grant/Contract Number:
EE0007004; AC05-76RL01830
OSTI ID:
1923589
Alternate ID(s):
OSTI ID: 1924496
Report Number(s):
PNNL-SA-178327; S2212982023000100; 102399; PII: S2212982023000100
Journal Information:
Journal of CO2 Utilization, Journal Name: Journal of CO2 Utilization Vol. 69 Journal Issue: C; ISSN 2212-9820
Publisher:
ElsevierCopyright Statement
Country of Publication:
Netherlands
Language:
English

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