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Micro algae as single cell protein carbon di oxide solar and geo thermal energies algae fish system



Micro algae as single cell protein carbon di oxide solar and geo thermal energies algae fish system



National Science Council Monthly 7(10): 1029-1035



Studies on Oscillatoria limnetica indicate that this microalga met many of the requirements of a food organism or single-cell protein and can be utilized as feed for fish and mammals effectively. Although mass culture of microalgae is one way to conserve solar energy, and it holds promises to provide new sources of protein, the production method exemplified by Chlorella (open agitation system) proves too costly. Low yield and high costs of C sources and of cell recovery are the main contributing factors. Algae have a growth rate slower than that of bacteria and yeasts. In a batch culture system, they display a relatively short logarithmic phase of growth; as soon as cell density reaches a certain point (generally not more than 2 g/l), self-shading and CO2 insufficiency become evident. Growth and yield are thus limited. The proposed CO2, solar and geothermal energies-algae-fish system entails the use of a waste gas from the geothermal power plant (CO2) to grow photosynthetically intense cultures of suitable algae (e.g., Oscillatoria, Lyngbya); the algae are transferred to a separate pond for fish farming. This concept eliminates the costly cell recovery process and also converts microbial protein to fish protein, which is fully acceptable to humans. Both algal pond and fish pond can be heated (particularly in winter time) by geothermal heat to accelerate growth and to extend the growing season.

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