CO2 bioremediation by microalgae in photobioreactors: Impacts of biomass and CO2 concentrations, light, and temperature

Abstract

Microalgae have the potential to recycle and bioremediate CO 2 and also produce chemical energy in the form of biomass. The potential production of renewable energy and high value products (i.e. carotenoid, antioxidants and polyunsaturated fatty acids) make large scale microalgal cultivation an attractive application. To achieve high productivity all microalgae cultures require CO 2 addition. Various microalgae species have shown different capabilities to bioremediate CO 2 . This review article reports biomass concentrations, biomass productivities, and CO 2 fixation rates of several microalgae and cyanobacteria species under different input CO 2 concentrations. The effect of important factors such as photo-bioreactor, temperature, light intensity on CO 2 removal have also been discussed.

Operational strategies for maximizing CO2 utilization efficiency by the novel microalga Scenedesmus obliquus SA1 cultivated in lab scale photobioreactor

“…Light intensity controls photosynthetic growth in any microalgal system. It also affects CO 2 removal rates, biomass concentration and overall growth rate [15]. In the present study it was found that SA1 showed improvement in all the growth kinetic parameters with an increase in light intensity ( Table 1).…”

“…Conventional coal-fired power stations release roughly 7% of total emitted CO 2 into the atmosphere. In general, the flue gases emitted from the power plants consist of 10-20% CO 2 [15]. There is thus an immediate need to develop a sustainable and environment-friendly CO 2 mitigation process.…”

Agitación y transferencia de masa de CO² en fotobiorreactores tipo airlift

“…Las microalgas con metabolismo fotoautotrófico tienen ventaja sobre las de metabolismo heterotrófico y mixotrófico porque generan beneficio ambiental por fijación de CO2, además de que pueden crecer en aguas residuales y reciclar nutrientes presentes en el agua (García, 2010;Kim, 2015;Raeesossadati, Ahmadzadeh, McHenry y Moheimani, 2014;Bajpai, Ales y Zappi, 2015). Varios análisis químicos verificaron que bajo metabolismo fotoautotrófico se produce 1 kg de bio masa (compuesta entre un 40 % y 50 % de carbono) a partir de 1.5 kg a 2 kg de CO2, que entra por difusión pasiva a la célula (Mazzuca, García, Camacho, Acién y Molina, 2000).…”

Algae-Based Wastewater Treatment for Biofuel Production: Processes, Species, and Extraction Methods

“…In order to raise algae in high concentrations, it is necessary to add CO 2 to the water. By bubbling in CO 2 into the rapidly growing algal cultures, it is possible to capture the majority of CO 2 produced by the cogeneration system (for a recent review, see Raeesossadati et al 2014 and Chap. 7).…”