| Summary: | 碩士 === 國立臺灣大學 === 環境工程學研究所 === 107 === Due to the lack of the fossil fuel, new energy types are widely studied. Microalgae grow fast and do not occupy any arable land. As their growing, microalgae can consume the nutrients and help clean the water.
Three microalgae strains were isolated from the local wastewater treatment plant in Taipei. Four strains from the culture collection and the three new strains were cultivated in BG11, respectively. The biochemical-compositions of these 7 microalgae are analyzed. Furthermore, synthetic wastewater is used as well in cultivating the newly isolated algae to get more details of their characteristics. The results from the 2 different culture media show that the protein contents are dependent on the concentration of nitrogen, and the carbohydrate and lipid contents are related to the limitation of nitrogen and the differences between the strains.
The removal efficiencies of nitrate was good and phosphate were unobvious when the microalgae are cultivated in synthetic wastewater without organic carbon. On the opposite, the efficiencies are outstanding when the microalgae are cultivated with other microorganisms and glucose. The bio-oil was converted from microalgae biomass using HTL. The yield of the bio-oil is related to the operating conditions such as temperature, pressure and holding time.
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