碩士 / 逢甲大學 / 環境工程與科學所 / 94 / Fossil fuels are limited around the world and using fossil fuels results in the emitting of greenhouse gases which cause the global warming and climate change. Therefore, more and more countries endeavor to develop renewable energies as an alternative energy to prevent the aggravation of global warming.
Biomass energy which stores in biomass is one of the major renewable energies in the world. In all kinds of biomasses, alga is one of the most potential species due to its higher growth rate. Alga can be systematically cultivated and harvested. After drying, lipid contained in algae can be extracted to produce bio-diesel. The residua can also be used as additives in animal feed or used as feedstock in fast-pyrolysis process to produce bio-oil. Therefore, algae seem to be a very attractive source of bio-energy and is evaluated it’s feasibility to produce biodiesel in this paper.
The evaluation shows that the biodiesel production cost of using algae with 40 % lipid content and 100 ton/ha/y production rate as feedstock is 27.61 NT/kg. This is much lower than those of other energy crop suitable cultivated in Taiwan. While the lipid content of algae increases from 40 % to 50 %, the biodiesel production cost even lowers to 23.29 NT/kg which is equal to the present diesel retail price (24.5 NT/L) in Taiwan. This shows excellent competitiveness of using oil-rich alga to produce biodiesel. Moreover, as the alga residua could be sold as additives in animal feeds or used to produce bio-oil, the economic benefits could be even higher.
In Taiwan, many native oil-rich algae species like Botryococcus braunii and Nitzschia palea contain more than 40 % of lipid. These algae are highly potential feedstock to produce biodiesel. However, we strongly recommend further studies and demonstrations should be carried out prior to large scale commercialization.
| Identifer | oai:union.ndltd.org:TW/094FCU05515005 |
| Date | January 2006 |
| Creators | Pei-Fen Wu, 吳佩芬 |
| Contributors | Tai-Lee Hu, 胡苔莉 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 88 |
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