earticle

영어

Cultivate of marine microalgae in the ocean for bioenergy seems to have bulky benefit in many aspects over conventional biofuel production. Any successful biofuel production must only depend on the eventual energy source of the world, the sun light. Ocean can provision larger area with less effects on the circumstances, free energy for blending such as wind and tidal flow, relatively small change in temperature and unlimited amount of water and eutrophic compounds for microalgae. However, since there would be no effective method to control light intensity, which is the most important parameter for algal growth, a beware-designed floating photobioreactor will be in need of pursuance of utilize the sun energy efficiently without photoinhibition. A variety of types of floating bag closed photobioreactors were designed and erected for culturing Dunaliella tertiolecta in the coastal area near Young-Heung Island. Various photobioreactors with different light transmission (ranging from 87% to 45%) were introduced. The maximum productivity of each type of photobioreactor was in the range between 0.07 g/L/day and 0.12 g/L/day. When an extra UV cutoff film is overlaid on high-transmitting bag, the growth of the cells inside the PBRs was greaten especially when the cell concentration was low. Relatively low-transmitting films would partially block the transmission of UV, resulting in no upbeat effect on cell growth when an extra UV cutoff film was overlaid. The results distinctly showed the well-known truth that the light is the most important parameter for algal culture even on near shore area and the PBRs for ocean culture must designed carefully to utilize the maximum potential of the natural sunlight.