| 研究生: |
黃毓涵 Huang, Yu-han |
|---|---|
| 論文名稱: |
小球藻最適化連續式培養之研究 Studies on Continuous Cultivation of Chlorella sp. under Optimal Conditions |
| 指導教授: |
吳文騰
Wu, Wen-teng |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 化學工程學系 Department of Chemical Engineering |
| 論文出版年: | 2009 |
| 畢業學年度: | 97 |
| 語文別: | 中文 |
| 論文頁數: | 119 |
| 中文關鍵詞: | 小球藻 、最適化 、連續式培養策略 、實驗設計法 |
| 外文關鍵詞: | continuous culture process, Chlorella sp., optimization, design of experiments |
| 相關次數: | 點閱:106 下載:16 |
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微藻因生長速率快且可經由光合作用固定大氣中的二氧化碳並轉化生成生物質,是相當具有潛力的生質能源生產者。因此,本研究為獲得高產率的藻類之生物質量與油脂,採用實驗設計法探討調控小球藻生長的各項重要影響因子,再以迴歸分析決定出培養小球藻的最佳條件,並以連續式培養策略與最適化操作條件來量產小球藻,以獲得其生物質量與油脂。
本研究以實驗設計法探討不同氮源濃度、光照強度、二氧化碳通氣量與鹽度對生物質量與油脂的影響。再以迴歸分析決定出小球藻之生物質量伴隨最高油脂產率的最佳培養條件:氮源濃度0.2 g/L、光照強度1200 μmol photon m-2 s-1、二氧化碳通氣量2.86%以及鹽度18.75 g/L。並由實驗獲致最高油脂產率與伴隨的生物質量產率分別為0.175 g/L-day和0.465 g/L-day。
在上述的最適化培養條件下,以具有時延項的Logistic方程式和Luedeking-Piret方程式分別擬合小球藻之生長及油脂生成的動力模式,並依此決定出連續式培養策略的最佳稀釋率,以獲得最大的小球藻目標物產量。所推導出的連續式操作策略,使小球藻於化學恆定的狀態下穩定的生長與量產藻體,且實驗所獲致的藻體產率為0.773 g/L-day,與具有時延項之生長動力模式所預測的結果之間的相對誤差為-10.53%。因此證實此具有時延項模型對於該系統的優越掌握能力,與連續式操作策略於最適化操作條件下的可行性。
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 productivities of biomass and lipid, design of experiments with regression analysis was applied to optimize the culture conditions of medium. Under the mentioned optimal culture conditions, a continuous culture process was purposed to carry out for harvesting microalgae continuously.
In this study, the design of experiments was defined to investigate the effects of initial nitrogen concentration, light intensity, carbon dioxide aeration rate and salinity on the growth and lipid formation of Chlorella sp.. Using regression analysis, the optimal culture conditions for the highest lipid productivity were estimated as 0.2 g/L of nitrogen concentration, 1200 μmol photon m-2 s-1 of light intensity, 2.86% of carbon dioxide aeration rate and 18.75 g/L of salinity. These conditions were verified experimentally, since the productivities of the biomass and lipid achieved to 0.465 and 0.175 g/L-day, respectively.
For knowing the growth kinetics and lipid formation of Chlorella sp., Logistic and Luedeking-Piret equations are considered as the models to approach the dynamics. These two kinetic models were further employed to predict the optimal dilution rate associated with the biomass and lipid concentration as 0.9253 and 0.7526 day-1, respectively. Under the optimal operating conditions, an experimental verification was carried out, and a reasonable good agreement between experimental data and model prediction is observed by the relative error of -10.53% and R squared of 0.9701. Therefore, the chemostat strategy with optimal operational condition is successfully employed for producing microalgal bioproduct.
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