Selection of Microalgae and Cyanobacteria Strains for Bicarbonate-Based Integrated Carbon Capture and Algae Production System

Using microalgae to capture CO 2 from flue gas is an ideal way to reduce CO 2 emission, but this is challenged by the high cost of carbon capture and transportation. To address this problem, a bicarbonate-based integrated carbon capture and algae production system (BICCAPS) has been proposed, in which bicarbonate is used for algae culture, and the regenerated carbonate from this process can be used to capture more CO 2 . High-concentration bicarbonate is obligate for the BICCAPS. Thus, different strains of microalgae and cyanobacteria were tested in this study for their capability to grow in high-concentration NaHCO 3 . The highest NaHCO 3 concentrations they are tolerant to were determined as 0.30 M for Synechocystis sp. PCC6803, 0.60 M for Cyanothece sp., 0.10 M for Chlorella sorokiniana , 0.60 M for Dunaliella salina , and 0.30 M for Dunaliella viridis and Dunaliella primolecta . In further study, biomass production from culture of D. primolecta in an Erlenmeyer flask with either 0.30 M NaHCO 3 or 2 % CO 2 bubbling was compared, and no significant difference was detected. This indicates BICCAPS can reach the same biomass productivity as regular CO 2 bubbling culture, and it is promising for future application.