Effects of dissolved inorganic carbon and nutrient levels on carbon fixation and properties of Thermosynechococcus sp. in a continuous system

► The cyanobacterium cell mass productivity reaches 1.7 g L−1 d−1 under the highest DIC and nutrients level. ► The regeneration of alkaline solution can be achieved from pH 9.5 to 11.3, and affected by DICin directly. ► The highest ΔDIC (DIC consumption) and DIC removal efficiency are 42 mM and 43%, respectively. ► Nutrients enrichment affects the cell mass productivity slightly, but affects the ΔDIC and DIC removal efficiency apparently. ► A negative correlation between ΔDIC and cell weight is discovered in chemostat.