Light Supply Coefficient : A New Engineering Parameter for Photobioreactor Design

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概要

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• The releability of the incident light intensities, the average light intensities and the light energy supplied per unit photobioreactor volume (E_t/V) as indices of light conditions inside photobioreactors was investigated in cuboidal photobioreactors of various sizes. There was no good relationship between the linear growth rates of Chlorella pyrenoidosa and the incident or average light intensities in the photobioreactors of various sizes.Although the linear growth rate increased with increase in E_t/V, there was much scatter of date near the curve.At a given E_t/V, the linear growth rates decreased with increase in the photobioreactor depth, indicating that the light distribution inside the photobioreactor must be considered for the rational design and scale-up of photobioreactors. A concept of light distribution coefficient (Kiv) defined as the cell concentration at which 50% of the photobiorector volume receives enough light for photosynthetic growth was therefore proposed. The linear growth rates increased with increase in Kiv but the date were scattered. At a constant Kiv, however, a linear relationship was observed between the linear growth rate and the E_t/V was held constant, there was a good correlation between the Kiv and the linear growth rate. A light supply coefficient, defined as E_t/V・Kiv was then propoesd as an index of the light supply efficiency of photobioreactors. There was a linear relation ship between the light supply coefficient and the linear growth rates of both C. pyrenoidosa and Spirulina platensis in cuboidal photobioreactors of various sizes. However, the slopes of the curves were different for the two microorganisms. When various other types of both internally illuminated and externally illuminated cylindrical photobioreactors were used, good correlation was found between the linear growth rates of Chlorella and the light supply coefficient. This demonstrates that irrespective of the cell type, photobioreactor type and size, the proposed light supply coefficient can be used for quantitative evaluation of light condition inside the photobioreactor. It is a usefl engineering parameter for design and scale-up of photobioreactors.

• 社団法人日本生物工学会の論文
• 1995-10-25

著者

• Ogbonna J

  Univ. Tsukuba

• Ogbonna James

  Institute Of Applied Biochemistry University Of Tsukuba

• Ogbonna J

  Department Of Fermentation Technology Faculty Of Engineering Yamanashi University

• Tanaka Hideo

  Institute Of Life Science And Bioengineering Graduate School Of Life And Environmental Science Unive

• Tanaka H

  Institute Of Applied Biochemistry University Of Tsukuba

• YADA HIROKAZU

  Institute of Applied Biochemistry, University of Tsukuba

• Tanaka Hideo

  Institute For Biological Resources And Functions National Institute Of Advanced Industrial Science A

• Yada Hirokazu

  Institute Of Applied Biochemistry University Of Tsukuba

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