부산대학교 도서관

This research evaluated the dual production of bioenergy in heterotrophic cultures of cyanobacteria. Process performance parameters, carbon balance, single-cell oil production, biofuel quality, volatile organic compounds (VOCs) generation, and sustainability metrics and impact indicators were assessed. The results showed biomass productivity of 1.03 kg/m³/d. Biomass (63.9%) and VOCs (8.56%) were the main products formed from the conversion of the substrate in the bioreactor. For single-cell-oil production, it is possible to obtain 0.18 kg/m³/d of lipid with this bioprocess. It was determined the fatty acid profile and the quality of biodiesel properties, meeting the requirements established by national and international standards. Besides, the 22 volatile compounds identified presented the energy potential of 122,205.00 kJ/kg and a power generation rate of 10,580.5 kg/m3/d. From an environmental point of view, the net energy ratio was 0.13, while the eight mid-points impact categories resulted in an ecotoxicity potential of 430.86 CTUe, energy resources of 230.04 MJ, global warming of 171.05 kg CO 2 eq, photochemical oxidation of 1.33 kg O 3 eq, water footprint of 1.08 m³, acidification of 0.44 kg SO 2 eq, eutrophication of 0.13 kg N eq, and ozone depletion of kg 1.83 × 10−5 CFC-11 eq, per functional unit of 1 m³ of the bioreactor, operating for 5 days. Finally, the proposed process can be considered as a promising strategy for renewable energy production from microalgae. • A bioprocess to simultaneously produce two bioenergy sources has been demonstrated. • Cassava starch as a carbon-based substrate supported the cyanobacteria growth. • Biodiesel properties proved to be suitable for production from single-cell oil. • Volatile organic compounds can be valuable renewable energy vectors. • The eight key mid-point environmental impact categories were addressed. [ABSTRACT FROM AUTHOR]