Experiments were carried out in a greenhouse in PVC open raceways (0.5 m long, 0.4 m wide, 0.075 m deep) containing 3 L of S. (Arthrospira) indica culture with an initial biomass concentration of 0.1 g/L. The cultures were mixed using paddle wheels turning at 18 revs/min and illuminated with daylight-type 40 W fluorescent lights (Philips, India) at an intensity of 1,900 lux and a 12 h light/dark photoperiod at 30˚C [15].