碩士 / 中興大學 / 環境工程學系所 / 99 / Nowadays, oil and natural gas storage on earth has been estimated to be depleted in 50 and 64 years, respectively. The quick development of human activities cause aggravation of greenhouse effect by combustion of fossil fuel, coal, oil and nature gas has become a global issue. Biodiesel is a renewable resource of energy that could be sustainable supplied and no net increased release of carbon dioxide and very low sulfur content. It is biodegradable and nontoxic. Thus, biodiesel is environmentally beneficial. These advantages can solve the problems of energy crisis and carbon dioxide emission.
Microalgae has the high potentials in biodiesel production compared to other oil crops due to microalgae can grow in ponds, fermentation units and even wastewater, simultaneous fixation of carbon dioxide not need to add extra organic carbon. Microalgae can utilize NH4+, NO3-, and PO3- as growth nutrients; thus, the coupling of advanced wastewater treatment and biodiesel production based on microalgae is a promising technology.
In this research, the important growth factor of microalgae, including the carbon dioxide concentration, illumination period, and initial pH will be concerned. Then the feasibility of nitrogen removal and lipid accumulation will also be investigated.
In this investigation, high lipid accumulating microagla Tai-07-2 was selected. The strain Tai-07-2 grew well under the condition of 5% CO2, initial pH5, and continuous illumination in BBM medium. It had biomass concentration of 1440 mg/l, lipid content of 28.18%. In industrial wastewater, experimental results indicated that Tai-07-2 could remove NH4+-N (42.9 mg/l), NO3--N (1.5 mg/l) effectively and had biomass concentration of 720 mg/l, lipid content of 20.38%. Consequently, it is possible to use microalgae Tai-07-2 to decrease nutrient concentration in the wastewater and subsequently to produce biodiesel.
| Identifer | oai:union.ndltd.org:TW/099NCHU5087088 |
| Date | January 2011 |
| Creators | He-Chuan Sun, 孫鶴娟 |
| Contributors | Chi-Mei Lee, 李季眉 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 89 |
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