碩士 / 國立成功大學 / 化學工程學系碩博士班 / 98 / Microalgae have received much attention as renewable energy resources, since the photoautotrophic mechanism can convert the atmospheric carbon dioxide into biomass. In order to harvest microalgae with the high production of biomass and provide high carbon dioxide utilization efficiency (CUE), the hybrid type photobioreactor was developed to improve the carbon dioxide mass transfer efficiency in the cultural system. After finding out the optimal gas supply conditions by experiments, a model was built up to obtain the optimal volume of cultural tank.
In this study, different aeration rates of carbon dioxide and air were carried out in the hybrid system, which was composed of 2 L absorption tower and 2 L cultural tank under 600 μmol/m2s of light intensity and 0.1 g/L of initial urea concentration. The best condition for obtaining large biomass production and high CUE was aerated with 2 L/min air and 20 ml/min carbon dioxide (2 % CO2), and there were 3.352 g biomass/reactor and 2.53 % of CUE from the batch cultivation.
It seems that increasing the cultural tank volume without any changes of the conditions in absorption tower can enhance the lighting hours of cultural system. The lighting hours in the hybrid system mentioned above (about 12 hr/day) was too short to use for model, so a 7.5 L-cutural tank of hybrid system, which has 19 hr/day of lighting, was carried out. For knowing the growth kinetics of Chlorella sp. and the consumption of carbon dioxide, Logistic equation and the principle of plug flow reactor (PFR) are considered as the model to approach the dynamics and mechanism. The optimal volume of cultural tank was 26 L, which was determined by model, with 2 L of absorption tower, which is aerated by 2 % CO2, and the biomass production, specific growth rate and CUE are 30.6 g/reactor, 0.0345 hr-1 and about 14 %, respectively. Therefore, the hybrid type photobioreactor is successfully employed for enhancing the production of biomass and carbon dioxide utilization efficiency.
| Identifer | oai:union.ndltd.org:TW/098NCKU5063093 |
| Date | January 2010 |
| Creators | Yu-ShanHuang, 黃鈺珊 |
| 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 | 73 |
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