Potential of CO_2 Elimination and Bioenergy Precursor Production by Marine Microalgae isolated from Southern Taiwan

In order to effectively screen the microalgae with high carbon dioxide bio-fixation efficiency, this study selected seawater near Hsin-Ta Power Plant in southern Taiwan as a sample source for screening of acid-tolerant microalgae. After purification, two isolate strains were tested for aeration with different concentrations of CO_2. The results showed that one of the microalgae has a better growth rate, and its carbohydrate content is higher than the other strains. After the identification of molecular biology, it should belong to Nannochloris species. Furthermore, the maximum of its growth rate can be up to 1.94 d^(-1) with a carbohydrate content of 35.5%. If it is further controlled in the future, such as cultivation under nitrogen limitation, then there is a chance to become a good source of bioethanol precursors coupled with carbon dioxide elimination.

關鍵字

Carbon dioxide ； Global warming ； Seawater microalgae ； Bio-energy

並列摘要

為了有效篩選高二氧化碳固定效率之微藻，本研究以南臺灣近興達電廠海域做為耐酸微藻取樣地點。進行純化後，共篩選出二株主要微藻藻株，以不同二氧化碳濃度進行曝氣生長測試之研究。研究結果顯示，二株微藻在10%CO_2曝氣條件下皆有很好的生長。其中一株微藻有較好的生長速率及碳水化合物含量，並在20%CO_2曝氣條件下生長。該株微藻在10%CO_2曝氣條件，其生長速率在碳水化合物含量35.5%下可達1.94 d^(-1)。而在氮限制條件下，碳水化合物含量可達46%及生長速率1.8 d^(-1)。經由分子生物技術鑑定後判定為Nannochloris sp.，預期未來在氮限制的環境下可有效做為生質能之生長工具。

並列關鍵字

二氧化碳；全球暖化；海洋微藻；生質能源

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