碩士 / 國立高雄海洋科技大學 / 水產養殖研究所 / 101 / Being an excellent source of plant-based protein, the Spirulina is a favorable candidate for large-scale commercial cultivation so as to achieve the purpose of carbon reduction and protein supplement for humans as well as high intelligent animals.
This test first selects a salinity and light source that is most suitable for growth while keeping costs low and growth efficiency high. With the combination of the 2 abovementioned growth conditions, a large scale farm test is carried out, followed by the process of increasing the quality and quantity of the Spirulinas. A cost-effective analysis is then carried out so that the best cost-effectiveness can be achieved.
The results obtained in this study revealed that:
(1) During light sources tests, the best results are achieved when daylight is used during the daytime and infrared LED (Light-emitting diodes) with the light intensity of 3000μ mol m-2 s-1 supplementing the light needed at night. This proves that low-power infrared lights have the ability to boost the specific growth rate of algal cells and keep cultivation costs low.
(2) In the comparison of different salinities (2L, 15L), a salinity of 3% proves to be the level that is most suitable for growth. Through adding a small of salts, the effect of lowering costs while boosting growth quantities can be achieved.
(3) Incorporating the two abovementioned growth conditions into the large-scale farm tests, the control group uses daylight and has a photoperiod of 12/12 (natural day/night), while the experimental group uses a combination of daylight + infrared light and has a photoperiod of 12/12 (daylight/infrared). Both groups have a water capacity of 500L and a temperature range of 30 - 34℃. The OD value (680nm) is taken every day and the test is repeated 3 times for a total of 432 hours. The results proved that the algal cells count (in cells/ML) for daylight + infrared surpassed that of daylight only. The same result is also obtained for the total quantities produced per unit, net of income and rate of income. This proves that a higher algal cell specific growth rate can be achieved with only a slight increase in cost.
(4) The total costs per unit and quantities produced in the large-scale farm tests far surpass that of the smaller scale lab cultivations (2L, 15L). This helps in lowing costs while increasing yield.
The large-scale farm tests prove to be able to reduce costs significantly while increasing yield. From this, we can see that infrared lights are suitable to be the natural source of light during daytime while keeping costs low and yield high during the night. As the rate of return for this industry is moderately high, it fits well into the Optimal Economic Scale and is suitable to be used as a source of reference for large-scale commercial cultivation.
| Identifer | oai:union.ndltd.org:TW/101NKIMT086008 |
| Date | January 2013 |
| Creators | Liang, Pei-Chun, 梁佩純 |
| Contributors | Huang, Kuei-Ming, 黃貴民 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 130 |
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