Initial investigations of a shallow-layer algal production system
Book
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OSTI ID:5598477
A system for the intensive cultivation of the marine diatom Phaeodactylum tricornutum is described and evaluated. Unique features of the system include: (1) the incorporation of a solar heat collection device which transmits only photosynthetically active radiation to the gowing cultue; (2) the formulation of a new seaweed enrichment medium that promotes physiological responses not previously observed in culture; and (3) the use of a foam fractionation device which separates microalgae from the culture media, adds CO/sub 2/-enriched air, and simultaneously recirculates the growing culture in shallow layers through an interconnecting series of hemicylindrical channels. The outdoor system demonstrated that very high ash-free dry weight yields of Phaeodactylum tricornutum are produced, a result of high photosynthetic efficiency. Observed photosynthetic efficiency, based on photosynthetically active radiation incident upon the external surface of the system, is 13.1%, nearly three times the limit previously considered economically practical. The data indicate that greater yields may be expected using this system at locations receiving higher insolation. It is concluded that this system clearly warrants further investigation to determine its capacity to produce large and economical quantities of algal biomass for use as potential petroleum-fuel substitutes. The development of a comprehensive and systematic bio-engineering program is recommended to upgrade and evaluate the system to its full potential. 4 figures, 4 tables.
- OSTI ID:
- 5598477
- Country of Publication:
- United States
- Language:
- English
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