[P004] Poster

1:00 PM - 1:50 PM JST(4:00 AM - 4:50 AM UTC)

[P02-206] Biotechnological Carbon Utilization from Steel-Industry Flue Gas via Adaptive Microalgal Cultivation

○Hsien-Yin Huang¹, Chun-Yen Chen¹ (1. University Center for Bioscience and Biotechnology, NCKU, Tainan, Taiwan (Taiwan))

Keywords:

Microalgae biotechnology,Industrial flue gas,Bioenergy production

Industrial flue gas represents a major anthropogenic carbon source and an underutilized feedstock for biotechnological carbon utilization. Emissions from the steel industry are characterized by extremely high CO₂ concentrations and acidifying components, creating a challenging environment for biological cultivation systems. Developing adaptive bioprocess strategies capable of operating under such conditions is critical for enabling industrial carbon valorization. This study investigates the feasibility of microalgal cultivation using steel-industry flue gas as a carbon source for sustainable biomass and bioenergy production. To support stable operation under high-carbon and fluctuating emission conditions, a knowledge-informed environmental control framework was implemented to guide adaptive cultivation management. Process knowledge regarding gas composition variability, pH buffering behavior, and culture response was structured to enable context-aware operational adjustments during cultivation. Mixotrophic microalgae (SMEE-1213) were cultivated using steel-industry flue gas (CO₂ 52–61%, NO_X < 210 ppm, SO_X < 120 ppm). The system maintained stable growth performance under extreme carbon loading conditions. Lipid accumulation reached approximately 26.5%, indicating enhanced potential for bioenergy applications. The adaptive control strategy supported cultivation resilience and improved operational stability under non-stationary gas inputs. These findings demonstrate the feasibility of utilizing steel-industry emissions as a carbon feedstock for microalgal bioprocessing. The proposed adaptive cultivation approach provides a scalable pathway for industrial carbon utilization, sustainable biomass production, and bioenergy generation. This work highlights the role of environmental biotechnology in supporting industrial decarbonization and advancing circular bioeconomy strategies.