Sequestration of carbon dioxide and production of biomolecules using cyanobacteria

Blue-Green Algae in Surface Water: Problems and Opportunities

“…These enable the cells to increase the CO2 substrate for 123 photosynthesis as well as the CO2 concentration in the cellular micro-compartments for efficient enzyme operation [2]. The use of cyanobacteria for CO2 sequestration has been found 125 to be very effective due to the presence of these CCMs [26,27].…”

Parametric study on CO2 sequestration using cyanobacterial consortium and production of macromolecules: experimentation, modelling and optimization

“…Researchers reported that phosphorous is one of the essential nutrients in growth (Lam et al ., 2012; Jebali et al ., 2018). However, the extent of growth relies extremely on the type of microalgae and growth ambience (Upendar et al ., 2018b). Figure 2(b) shows the lethal dose investigation for the test consortium.…”

“…The flask was set aside in algal incubator under adaptive laboratory conditions such as temperature: 25ºC, light intensity: 2400 Lux, dark/light cycle ratio: 8/16 h. The samples were withdrawn at regular time intervals of 2 days and the biomass was collected from broth using centrifuge (ELTEK TC8100F, India) at 5000 rpm for 15 min and the collected biomass was dried out in an air oven at 50ºC for 12 h and weighed. The biomass obtained after the biofixation of CO 2 was used for the assessment of lipid, protein and carbohydrate concentrations following standard methods (Upendar et al ., 2018b). The lethal dose analysis was performed by growing the test strain at diverse CO 2 concentrations.…”

“…The values of sodium carbonate concentrations corresponding to 5%, 10%, 15%, 20% and 30% CO 2 concentrations at pH 7 in the media are 1.27, 2.55, 3.81, 5.102 and 7.65 g/L, respectively (Upendar et al ., 2018b). The test strain was grown at dissimilar CO 2 concentrations individually.…”

“…Furthermore, since only 0.03 to 0.04% of CO 2 is present in the atmosphere, the dissolution of CO 2 to water is mass transfer (diffusion) limited operation and therefore, lower cell growth of microalgae is expected when gaseous CO 2 is used as carbon source (Chelf et al ., 1993). Several microalgal and cyanobacterial species have the ability to convert the soluble forms of carbonates to CO 2 by carbonic anhydrase enzyme through carbon concentration mechanism (Aizawa and Miyachi, 1986; Upendar et al ., 2018b). Cultivation of algae for treatment of flue gas towards the lessening of CO 2 levels may be considered as a promising technique (Upendar et al ., 2018a).…”