Modified Photobioreactor for Biofixation of Carbon Dioxide by Chlorella vulgaris at Different Light Intensities

Abstract

The performance of a modified bioreactor inside a light enclosure for carbon dioxide biofixation by Chlorella vulgaris was investigated. The influence of different light intensities on the CO 2 biofixation and biomass production rates was evaluated. The results showed that the photon flux available to the microalgal cultures can be a key issue in optimizing the microalgae photobioreactor performance, particularly at high cell concentrations. Although the optimal pH values for C. vulgaris are in the range of 6-8, cell growth can take place even at pH 4 and 10. Batch microalgae cultivation in the photobioreactor was used to investigate the effect of different light intensities. The maximum biomass concentration of 1.83 g L -1 was obtained at a light intensity of 100 μmol m -2 s -1 and under aeration with 2 L min -1 of 2 % CO 2 -enriched air.

Enhancement of CO2 biofixation and lipid production by Chlorella vulgaris using coloured polypropylene film

“…Reducing the light intensity to below (250 µE m -2 s -1 ) enhances the algal growth, corroborating outputs from a previous study [30].…”

“…6). Previous studies based on the same algal strain using an unfiltered light (U P ) source at light intensities of 100 and 50 μE m -2 s -1 compared with 250 μE m -2 s -1 in the current study and [30] suggests unfiltered light to be 33-50% less effective at promoting algal growth and 75% less effective at promoting lipid productivity than filtered CT W in the current study. U P indicated a similar trend of about 20-30% reduced influence in supporting algal growth compared with CT W , although there was a slight enhancement in U P of about 13-20% in algal growth compare with U as a results of lower light intensity used in U P .…”

“…U P indicated a similar trend of about 20-30% reduced influence in supporting algal growth compared with CT W , although there was a slight enhancement in U P of about 13-20% in algal growth compare with U as a results of lower light intensity used in U P . The optimum irradiance intensity for maximum Cv growth was previously reported as being 100 μE m -2 s -1 [24,30].…”

Loofah-based microalgae and cyanobacteria biocomposites for intensifying carbon dioxide capture

“…Approximately 70% of microalgae and cyanobacteria carbon capture trials have used open pond growth systems, which require substantial land and water, are vulnerable to biological contamination [18], and are exposed to variable weather and climate conditions, which compromise performance. Closed culture systems (photobioreactors, PBR) can overcome many of these drawbacks [19][20][21]; however, PBRs are not without their operational, performance, and sustainability challenges [22,23].…”

Optimization of cultivation conditions for enhancing biomass, polysaccharide and protein yields of Chlorella sorokiniana by response surface methodology

“…Under the double action, the density of the algae liquid drops sharply. Naderi, Tade, and Znad (2015) studied the effects of aeration conditions on the growth of Chlorella in different reactors. They found that the more uniform distribution of algal cells and nutrients is a prominent advantage in increasing ventilation, but higher aeration results in greater friction and shear forces, which is detrimental to the growth of microalga.…”