Effects of varying sodium nitrate and carbon dioxide quantities on micro-algae growth performance of a designed tubular photobioreactor and a channel photobioreactor

Algae are highly taken into consideration because of their nutritional value and different applications in environment cleaning. also nowadays, algae are considered as an energy source. efficient photobioreactors are used for increasing the mass of micro‐algae. however, one of the limiting factors in suitable nutrient application in cultivation of micro-algae is biomass movement. sodium nitrate and carbon dioxide are important restrictive factors in microalgae growth. in this research, the performance of a designed tubular photobioreactor in islamic azad university, varamin branch was compared with that of a channel photobioreactor under various co2 and nano3 quantities. therefore, by varying the amount of co2 and nano3 on microalgae growth while keeping factors such as temperature, ph and light intensity constant, the performance of two different photobioreactors were compared. a factorial experiment with three replications was carried out with different amounts of nano3 (0.75, 1.5 and 3 mm) and co2 (0.2, 0.35 and 0.5 l /min). results showed that the growth of microalgae increased significantly by increasing co2 and nano3 quantities (p<0.05). moreover, comparison of the means showed that the designed tubular photobioreactor performed better than the channel photobioreactor