碩士 / 國立成功大學 / 化學工程學系碩博士班 / 95 / Microalgae need to uptake the light to conduct the photosynthesis for growing biomass, In addition, the distribution of light intensity is the key factor for growth kinetic of microalgae. For instances, open pond, is a general photobioreactor to produce microalgae, but the increase of microalgae concentration decreases the light penetration in the cultivated microalgae system caused by shading effect. Since the large gradient of light intensity in depth results low culture efficiency, the photo-bioreactor, which is an open tank inserted some transparent flat-plates, is proposed to remove the concern of large gradient.
In this study, there two kinds of photobioreactors, the open tank and the proposed photobioreactor, are compared by the performance index Fab. Fab means the photon flux absorbed by the unit biomass; and it is derived from Iav, the averaged irradiance inside of the photobioreactor estimated by Lambert-Beer’s law. Since Fab value of the proposed photobioreactors is larger than open tank, the biomass productivity is also higher. Large Fab implies that much light is absorbed by microalgae in the photobioreactor through the sides of hollow flat-plates.
By the experimental observation, the proposed photo-bioreactor, which is composed of the open tank and inserted four 5 cm width flat-plates, performs 24 % better than the common open tank in biomass productivity. And the biomass productivity gains 13 % more, when it is operated in semi-continuous instead of batch modes.
Keywords: Microalgae, Photobioreactor, Lambert-Beer's law, Averaged irradiance, Photon flux absorbed by the biomass unit
| Identifer | oai:union.ndltd.org:TW/095NCKU5063096 |
| Date | January 2007 |
| Creators | Chih-Jui Hung, 洪志瑞 |
| Contributors | Wen-Teng Wu, 吳文騰 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 83 |
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