Reactor type Algal cultures Inlet CO2 (%) CO2 Fixation / utilization efficiency References Three-stage serial tubular Photobioreactor Spirulina sp. 6% (v/v) and 12% (v/v) 53.29% and 5.61% respectively [14] Membrane Photobioreactor Chlorella vulgaris 1% (v/v) (3 L/min) 80 to 260 mg l –h-1 [15] Vertical tank Photobioreactor Chlorella sp. 2%, 5%, 10% and 15%, at 0.25 vvm 0.261, 0.316, 0.466 and 0.573 g h-1 [16] Outdoor open Photobioreactor Chlorella sp. Flue gas (6–8% v/v CO2) 10-50 % [17] Membrane Carbonation Photobioreactor (bubble-less) Synechocystis sp. PCC6803 29 g C/m3 88% [18] Tubular Photobioreactor Chlamydomonas sp. 10%-40% (Variable flow) 3-12% respectively [19] Air lift Photobioreactor Scenedesmusobliquus Flue gas (18% CO2) 67% [20] Internally illuminated Photobioreactor Nannochloropsissalina 0.035-2% 0.57-2.35 g CO2 1-1 d-1 [21]

Table 1: Performance of various algal cultures and photobioreactors with respect to CO2 fixation