Purpose: A major objective of the project is investigating ways to produce biodiesel base on the carbon dioxide produced with the flue gases form the cement furnaces.
Theoretical framework: This promising technology is based on the biological capture of CO2 using microalgae and cyanobacteria. These microorganisms can fix CO2 using solar energy with efficiency ten times greater than terrestrial plants. The biomass produced can also be used for high value co-products as cosmetics, human health, human and animal food, fertilizers and biofuels. This review describes the situation caused from anthropogenic activities and a sustainable solution for CO2 capture.
Results: In 2015 CEMEX establish a target of 35% reduction of fossil fuels for alternative fuels. In 2011 they have produced 25.4 million metric tons of CO2 per 95.6 million metric tons of cement. In theory 25.4 million of tons of CO2 can be fixed with microalgae and produce approximately 12.7 million tons of biomass. Thus, with a 20% transesterified fats that can transform into 2.54 million tons of biodiesel.
Conclusions: . Cement Companies are responsible of high amount of CO2 delivered to the atmosphere while microalgae have shown higher CO2 capture than higher plants, therefore design a process coupled with flue gasses exhaust of cement chimneys and microalgae culture can be developed. Additionally, microalgae produce lipids that can be transformed in biodiesel to be used in the transport sector. Design concepts, microalgae culture and species must be evaluated for this application at the same time parameters of flue gas composition and temperature. Microalgae can also be used for waste water treatment and chemistry applications complementing a biorefinery plant.