恭喜本系碩士班一年級石瀞亓同學獲得第十四屆國際綠色永續生物科技研討會壁報獎

時間：2024年1月26-27日

地點: 陽明交大 博愛校區 賢齊館

主題: Carbon capture of red macroalga Sarcodia suiae using aquaculture wastewater and flue gas in outdoor 100 L photobioreactor for circular economy

指導教授：李澤民

Jing-Chi Shih (石瀞亓)1, Tse-Min Lee1, Corresponding author: Jing-Chi Shih 1

1Department of Marine Biotechnology and Resources, National Sun Yat-sen University

Macroalgae (seaweeds) that poses high photosynthetic efficiency and high biomass growth ability as compared to terrestrial plants and microalgae are the potential source for carbon capture in mitigating global warming caused by accumulated anthoprogenic carbon dioxide (CO2) emission. The development of the cost-effective system in seaweed culture is critical for the implementation of bio-carbon negative technology. The wastewater of aquaculture that is a large well-known agricultural industry with extemsive farming areas and the flue gas from natural gas power plant provide nutrient and CO2 source for boosting seaweed growth. In turn, it prioritizes waste reduction and carbon removal in a cost-effective way. Sarcodia suiae, a red macroalga with well-developed stock culture system gives an opportunity for year-round culture in Taiwan. In the cold winter season, it is suitable for this seaweed culture due to no heat stress. Using indoor 2-L photobioreactor (PBR) and outdoor 100-L PBR, the biomass increase reached 19,21% with 4,80%/d and 21,20% with 3.03%/d, respectively in shrimp wastewater (SWW) and flue gas containing 5% CO2, 100 ppm NO, and 100 ppm SO2 purging in 0.05 vvm. For 2-L PBR, the removal rate of COD, N nitrogen and P nutrient were 57.67%, 100%, and 100%, respectively, while those were 80.99%, 100%, and 100% in 100-L PBR. As extimated, the CO2 capture amount was 357.21 and 198.55 ton CO2/ha/y using 2-L and 100-L PBR, respectively. The concentration in exhaust emissions post PBE was 0.19% with the removal capacity of 96.20%. For the life cycle assessment in the whole culture platform, the negative carbon benefits for 100-L PBR is -527.75 kg CO2e for 1 Kg biomass using solar energy as power and SWW and flue gas as nutrient and CO2 sources. This PBR system for seaweed, such as Sarcodia, is a promising carbon-negative platform, serving as a powerful method for carbon reduction.